vor antenna

Operation & Maintenance Manual

Manual Part No. 570002-0001

MODEL 1150DOPPLER VOR (DVOR) ANTENNA

49 Antenna VersionPart No. 470165-0001Part No. 470165-0002

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION ANDSUCH INFORMATION MAY NOT BE DISCLOSED TO OTHERS

FOR ANY PURPOSE NOR USED FOR MANUFACTURING PURPOSES WITHOUTWRITTEN PERMISSION FROM AIRPORT SYSTEMS INTERNATIONAL, INC.

Copyright, Airport Systems International, 1991Revised April, 1993

AIRPORT SYSTEMS INTERNATIONAL, INC.11300 West 89th Street

Overland Park, KS, U.S.A. 66214

THIS SHEET INTENTIONALLY BLANK

MODEL 1150 DVOR ANTENNA

Rev. A April, 1993

LIST OF EFFECTIVE PAGES

Page No. Issue Page No. Issue

*Title April, 1993 6-1 thru 6-2 October, 1991Blank October, 1991 7-1 October, 1991*Effective Pages April, 1993 7-2 Blank October, 1991*Blank April, 1993 *8-1 thru 8-4 April, 1993*Record of Revisions April, 1993 9-1 thru 9-3 October, 1991*Blank April, 1993 *9-4 April, 1993*Rev A Highlights April, 1993 9-5 thru 9-6 October, 1991*Blank April, 1993 *9-7 April, 1993Safety Summary October, 1991 9-8 October, 1991How to Order October, 1991 *9-9 thru 9-23 April, 1991Warranty October, 1991 9-24 Blank October, 1993Warranty October, 1991 10-1 October, 1991*i April, 1993 10-2 October, 1991ii October, 1991 *11-1 April, 1991*iii thru vi April, 1993 11-2 October, 19911-1 thru 1-7 October, 1991*1-8 thru 1-9 April, 19931-10 Blank October, 19912-1 October, 1991*2-2 thru 2-3 April, 19932-4 thru 2-12 October, 19913-1 October, 19913-2 Blank October, 19914-1 October, 19914-2 Blank October, 1991*5-1 April, 19935-2 October, 1991

*An asterisk indicates pages changed, added, or deleted by the latest revision.


Overland Park, KS U.S.A. 66214


Rev. A April, 1993



Rev. A April, 1993

Airport Systems International, Inc.

RECORD OF REVISIONS

+)))))))0)))))))))))))))0)))))))))0)))))))0))))))))))))))0)))))))))),* Page * Revision *Insertion*Page * Revision *Insertion **Number /))))))))0))))))1 Date *Number /)))))))0))))))1 Date ** * Level * Date * * * Level * Date * *G4444444P44444444P444444P444444444P4444444P4444444P444444P4444444444I* All * A *04/93 * 04/93 * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * ** * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * */)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1* * * * * * * * *.)))))))2))))))))2))))))2)))))))))2)))))))2)))))))2))))))2))))))))))-


Rev. A April, 1993



Rev. A April, 1993

Airport Systems International, Inc.11300 W. 89th St.

Overland Park, KS 66214

DATE: April, 1993

TO: Holders of the Model 1150 Doppler VOR (DVOR) Antenna Manual (Part. No. 570002-0001).

REVISION (A) HIGHLIGHTS

Pages which have been revised, together with the highlights of this revision, are outlined below. Remove the affected pages and replace them with these revised pages. Retain all revision highlightspages. They should be inserted in the manual immediately following the Record of Revisions.

Page No. Description of Change Effectivity

Effective Pages This page has been added to the manual. April, 1993Record of Revisions This page has been added to the manual. April, 1993REV A HLTS This page has been added to the manual. April, 19931-8 Table 1-2 has been revised. April, 19931-9 Paragraph 1.6 and table 1-4 as been added. April, 19932-2 This page has been revised. April, 19932-3 Figures 2-1 and 2-2 have been changed. April, 19938-1 Table 8-1 has been revised. April, 19938-2 This page has been revised. April, 19938-3 thru 8-4 These pages have been added to the manual. April, 19939-4 Figure 9-2 has been revised. April, 19939-7 thru 9-18 These pages have been revised. April, 19939-19 thru 9-24 These pages have been added. April, 199311-1 This page has been revised. April, 199311-3 This page has been added to the manual. April, 1993


Rev. A April, 1993



Rev. - October, 1991

The equipment is supplied by Airport Systems International, Inc. For replacement parts and repairservice, contact Airport Systems International, Inc.

HOW TO ORDER REPLACEMENT PARTS

When ordering replacement parts, you should direct your order as indicated below and furnish thefollowing information insofar as applicable. To enable us to give better replacement service, please besure to give us complete information.

INFORMATION REQUIRED

1. Airport Systems International, Inc. model number, type and serial number of equipment.

2. Unit sub-assembly number (where applicable).

3. Item or reference symbol number from parts list or schematic.

4. Airport Systems International, Inc. part number and description.

5. Manufacturer's code, name and part number (where applicable).

6. Quantity of each replacement part required.

CORRESPONDENCE/SHIPPING ADDRESS


Overland Park, Kansas 66214U.S.A.

COMMUNICATIONS

Telephone: 913/492-0861Telex: 49610240 Airport Sys Int.

Fax: 913/492-0870



AIRPORT SYSTEMS INTERNATIONAL, INC.MANUFACTURER'S WARRANTY

A. The Manufacturer warrants to the original purchaser, subject to the limitations and exclusionsstated below, that all mechanical and electrical parts of products which it manufactures (the "Products")will be free of defects in materials and workmanship for a period of (i) one year from the date ofinstallation or (ii) eighteen (18) months from the date of shipment, whichever first occurs (the "WarrantyPeriod").

B. If the Customer believes a Product is defective, notice thereof shall be provided to theManufacturer's Customer Service Department at the address provided on the cover page and (ifapplicable) to the selling Distributor. A defect in materials and workmanship covered by this warrantyshall be deemed to have occurred only if, and as of the time when, the Manufacturer is notified inwriting by the Customer, within the Warranty Period, that the Product has become defective, and theManufacturer's personnel verify that the said Product, in fact, does not comply with the warrantyprovided hereunder and it is determined that:

(i) The Products, during the entire Warranty Period, have been operated within normal serviceconditions recommended by the Manufacturer and recognized in the industry, and

(ii) The Products have been installed and adjusted according the Manufacturer's procedures asstated in the Instruction Manual or other instructions supplied in writing by the Manufacturer.

C. Failures caused by lightning or other acts of God, or power surges, are not considered to bedefects in materials and workmanship and are not covered under this warranty. Routine maintenanceand calibration are also not considered to be defects in materials and workmanship and are not coveredunder this warranty, Any change, modification or alteration of the Manufacturer's Products notspecifically authorized by the Manufacturer will void this warranty.

D. If it is determined that the conditions for warranty coverage, as described above, have beensatisfied, the Manufacturer shall repair or replace the defective Products or parts thereof in accordancewith the following procedures:

(i) Customer will contact the Manufacturer's Customer Service Department which will issue theCustomer a Return Authorization (RA) number.

(ii) The component, defective part, or Product, as appropriate, shall be returned to theManufacturer for inspection, freight prepaid by the Customer. The RA number must be clearlydisplayed on the exterior of the shipping container. No shipments will be accepted without a RAnumber. All customs duties, fees, etc. will be paid by the Customer.

(iii) If, upon inspection, it is determined by Manufacturer's personnel that the Product orcomponent thereof is indeed defective and covered by this warranty, then Manufacturer, at itsoption, may either repair the Product or defective component



AIRPORT SYSTEMS INTERNATIONAL, INC.MANUFACTURER'S WARRANTY

(Cont)

thereof and return the same to the Customer or ship a replacement for the defective Product orpart thereof, freight paid. All customs duties, fees, etc. will be paid by the Customer. TheProduct or component thereof will be returned to the customer utilizing a shipping mode similarto that used by Customer to ship the same to the Manufacturer.

(iv) If, upon inspection by Manufacturer, it is determined that the Product or component thereofwas not defective or was not covered by this warranty, then the cost of all of Manufacturer'sinspections and the return shipping charges will be charged to Customer.

E. The Manufacturer reserves the right to make modifications and alterations to Products withoutobligation to install such improvements on, in, or in place of theretofore manufactured Products ofManufacturer.

F. Manufacturer does not warranty any Products, components, subassemblies, or parts not of itsown manufacture. Manufacturer hereby transfers to Customer any and all warranties (if any) which itreceives from its suppliers.

G. This warranty applies only to the original purchaser and, unless Customer receives the expresswritten consent of an officer of Manufacturer, this warranty may not be assigned, transferred, orconveyed to any third party, even if the third party is a bona a fide purchaser of the Products.

H. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,EXPRESSED OR IMPLIED, WHETHER STATUTORY OR OTHERWISE, INCLUDING ANDIMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE MANUFACTURER BE LIABLE FOR INDIRECT, INCIDENTAL,COLLATERAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES OF ANY KIND, WHETHERARISING OUT OF CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY, OR OTHERPRODUCTS LIABILITY THEORY.

I. CUSTOMER'S SOLE REMEDY FOR ANY BREACH OF THE WARRANTY SHALL BETHE REPAIR OR REPLACEMENT OF THE PRODUCTS BY THE MANUFACTURER ASPROVIDED HEREIN, AND IN NO EVENT SHALL THE MANUFACTURER BE REQUIRED TOINCUR COSTS FOR THE REPAIR OR REPLACEMENT OF ANY PRODUCT IN EXCESS OF THEPURCHASE PRICE OF SUCH PRODUCT, PLUS ANY TRANSPORTATION CHARGESACTUALLY PAID ATTRIBUTABLE TO SUCH PRODUCTS.


Rev. A April, 1993 i

TABLE OF CONTENTS

SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

Paragraph Description Page

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.2 Equipment Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.2.1 Carrier Antenna Version 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21.2.2 Carrier Antenna Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31.2.3 Sideband Antenna Version 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41.2.4 Sideband Antenna Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51.2.5 Tuning Stub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.6 Positioning Piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.7 Balun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.8 Pedestal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.9 Radome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.10 Counterpoise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.2.11 Field Monitor Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61.3 Equipment Specification Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-81.4 Equipment Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-81.5 Equipment Required But Not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-91.6 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

SECTION 2. TECHNICAL DESCRIPTION

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12.2 Simplified Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12.3 Detailed Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

SECTION 3. OPERATION

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

SECTION 4. STANDARDS AND TOLERANCES

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1


ii Rev. - October, 1991

TABLE OF CONTENTS (Cont)

SECTION 5. PERIODIC MAINTENANCE


5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15.2 Performance Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15.3 Other Onsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15.4 Offsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

SECTION 6. MAINTENANCE PROCEDURES

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.2 Performance Check Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.3 Other Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.3.1 Site Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.3.2 Inspection of Antenna System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.3.3 Inspection of Field Monitor Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26.4 Special Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

SECTION 7. CORRECTIVE MAINTENANCE

7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

SECTION 8. PARTS LIST

8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

SECTION 9. INSTALLATION, INTEGRATION, AND CHECKOUT

9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19.2 Unpacking and Repacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19.3 Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19.4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19.4.1 Sideband Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19.4.2 Theodolite Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-29.4.3 Tape Measure and Spirit Level Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-59.4.4 Carrier Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8


Rev. A April, 1993 iii

TABLE OF CONTENTS (Cont)

SECTION 9. INSTALLATION, INTEGRATION, AND CHECKOUT


9.4.5 Cutting Antenna Feed Cables to Proper Electrical Length . . . . . . . . . . . . . . . . . . . . . . . 9-99.4.6 Tuning the Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-129.4.7 Adjusting Phase Length of Sideband Antennas to Carrier Antenna . . . . . . . . . . . . . . 9-149.4.8 Field Monitor Antenna Foundation Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-169.4.9 Field Monitor Antenna (470178-0001) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-149.4.10 Field Monitor Antenna (470178-0002) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20

SECTION 10. SOFTWARE

10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

SECTION 11. TROUBLESHOOTING SUPPORT

11.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

LIST OF TABLES

Table No. Description Page

1-1 Equipment Specifications Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-81-2 Equipment Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-81-3 Equipment Required But Not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-91-4 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

2-1 Positioning Piece Part Number and Length for DVOR Frequencies . . . . . . . . . . . . . . . 2-22-2 Doppler Shift Values from Heterodyning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

5-1 Maintenance Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15-2 Other Onsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

8-1 Doppler Antenna Kit (48 Antenna) (470165-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18-2 Stand Alone DVOR Carrier Antenna Kit (470209-0001) . . . . . . . . . . . . . . . . . . . . . . . 8-28-3 Carrier Antenna Kit with Walk-in Radome (470208-0001) . . . . . . . . . . . . . . . . . . . . . 8-28-4 Civil Installation Kit Rohn Antenna (470252-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3


iv Rev. A April, 1993

LIST OF TABLES (Cont)

Table No. Description Page

8-5 Doppler Field Monitor Kit (470178-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-38-6 Doppler Field Monitor Kit (470178-0002) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

9-1 Equipment Required for Installation but not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

LIST OF ILLUSTRATIONS

Figure No. Description Page

1-0 Model 1150 Doppler VOR (DVOR) Antenna Family Tree . . . . . . . . . . . . . . . . . . . . . . . vi1-1 Typical DVOR Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-2 Carrier Antenna (Version 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21-3 Carrier Antenna (Version 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31-4 Sideband Antenna (Version 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41-5 Sideband Antenna (Version 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51-6 DVOR Field Monitor Yagi Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

2-1 Approximate Current Distribution for Each Element of the Alford Loop Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-2 Diagram of an Alford Loop Antenna Showing Current Direction in One of the Four Half-Wave Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-3 Generation of Azimuth-Dependent FM by a DVOR Station . . . . . . . . . . . . . . . . . . . . . 2-52-4 Phase Relationship of DVOR Course Forming Signals . . . . . . . . . . . . . . . . . . . . . . . . . 2-62-5 Instantaneous Direction of an RF Source with Respect to Aircraft

Receivers A, B, C, and D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82-6 Received and Detected AM and FM Signals by Aircraft

Receivers A, B, C, and D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92-7 Doppler Shift (Wave Front Measurement) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102-8 Doppler Shift (Heterodyning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

9-1 Antenna Spacing on Counterpoise Mounting Rail Using Theodolite . . . . . . . . . . . . . . 9-29-2 Antenna Placement on Counterpoise Mounting Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-49-3 Antenna Spacing on Counterpoise Mounting Rail Using Sight

and Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-79-4 Carrier Antenna Pedestal Installation Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-89-5 RF Connector Assembly Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-99-6 Equipment Setup for Cutting RF Cables to Proper Electrical Length . . . . . . . . . . . . . 9-10


Rev. A April, 1993 v

LIST OF ILLUSTRATIONS (Cont)

Figure No. Description Page

9-7 Diagram of RF Feed Cable, Tuning Stub, RF Tee Connector, and Positioning Piece Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11

9-8 Equipment Setup for Calibrating Vector Voltmeter to 0E . . . . . . . . . . . . . . . . . . . . . . 9-129-9 Equipment Setup for Tuning the Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-139-10 Test Equipment Setup for Sideband Antenna to Carrier Antenna Phasing . . . . . . . . . 9-159-11 Typical DVOR Field Monitor Antenna Foundation Installation . . . . . . . . . . . . . . . . . 9-179-12 Typical DVOR Field Monitor Antenna and Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-199-13 DVOR Field Monitor Antenna and Tower (Part No. 470178-0001)

Parts Location Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-219-14 DVOR Field Monitor Antenna and Tower (Part No. 470178-0002)

Parts Location Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-23

11-1 Assembly, DVOR Antenna Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3


vi Rev. A April, 1993

Figure 1-0. Model 1150 Doppler VOR (DVOR) Antenna Family Tree.


Rev. - October, 1991 1-1

SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

1.1 INTRODUCTION.- This technical instructional book contains data required to install, operate, andmaintain the DVOR mechanical Alford loop antenna, supplied by Airport Systems International, Inc.,Overland Park, Kansas. Included are a general description and specification data, technical description,operating procedures, standards and tolerances, periodic and corrective maintenance instructions, parts list,installation instructions, and troubleshooting support data.

This section contains an equipment description, including purpose of the equipment, accessories supplied,and equipment required but not supplied.

1.2 EQUIPMENT DESCRIPTION.- Figure 1-1 shows a typical DVOR site. The DVOR antenna systemconsists of a single carrier antenna assembly at the center of the counterpoise, and 48 sideband antennaassemblies spaced equally in a 44 foot diameter circle concentric with the carrier antenna assembly.

The mechanical Alford loop antenna is constructed of two fixed-length dipole antennas, folded and arrangedso that the element midsections form a square approximately 1/4 wavelength on each side. The carrier andsideband antennas consist of a single Alford loop, mounted on a support plate. The support plate is mounted48 inches (approximately one-half wavelength) above the counterpoise by metal pedestal. This is to insurethe proper coverage of the signal in-space. The pedestal provides a conduit for RF feed lines, 180 degreebalun, and the antenna tuning stub. Each antenna element is enclosed in a weatherproof, cone-shapedfiberglass radome.

Figure 1-1. Typical DVOR Site.


1-2 Rev. - October, 1991

The antennas are mounted on a counterpoise. The counterpoise is a circular, metallic support structure thatis made of aluminum or galvanized steel and is assembled in segments that are bolted together. Thecounterpoise is between 60 and 120 feet in diameter and is elevated between 8 to 20 feet above ground level.

1.2.1 Carrier Antenna (Version 1).- Refer to figure 1-2. The carrier antenna version 1, is a single Alfordloop on a support plate. The antenna is supported above the counterpoise by a metal pedestal. This antennais electrically tuned to the station frequency by means of two large, air-dielectric, metal disc capacitors.

Figure 1-2. Carrier Antenna (Version 1).



1.2.2 Carrier Antenna (Version 2).- Refer to figure 1-3. This antenna is electrically identical to carrierantenna Version 1. The Version 2 antenna has been upgraded. The two large, air-dielectric, metal disccapacitors used in the Version 1 antenna have been replaced by a single, high voltage, glass capacitor. Thisgreatly improves tuning and makes the antenna less susceptible to vibration and corrosion because of thereduction in the number of mechanical parts. Mounting is identical to version 1.

Figure 1-3. Carrier Antenna (Version 2).



1.2.3 Sideband Antenna (V1).- Refer to figure 1-4. Each sideband antenna is an Alford loop, similar tocarrier antenna (V1) but, without the large hole in the center of the support plate. This antenna iselectrically tuned to the station frequency by means of two large, air-dielectric, metal disc capacitors. The antennas are mounted independently on individual support plates, supported above the counterpoiseby metal pedestals equal in height to the carrier antenna.

Figure 1-4. Sideband Antenna (Version 1).



1.2.4 Sideband Antenna (V2).- Refer to figure 1-5. Each sideband antenna is electrically identical tosideband antenna Version 1. The Version 2 antenna has been upgraded. The two large, air-dielectric,metal disc capacitors used in the Version 1 antenna have been replaced by a single, high voltage, glasscapacitor. This greatly improves tuning and makes the antenna less susceptible to vibration andcorrosion because of the reduction in the number of mechanical parts. Mounting is identical to version1.

Figure 1-5. Sideband Antenna (Version 2).



1.2.5 Tuning Stub.- The tuning stub is a 90E line section made out of RG-214 cable with a connector onone end and open at the other end. The basic function of the stub is to supply the needed capacitivereactance to make the point of the stub attachment pure resistive.

1.2.6 Positioning Piece.- The positioning piece is a length of RG-214 cable with a connector at eachend. The purpose of the positioning piece is to place the tuning stub at a point on the input line wherethe resistive component of the complex impedance is equal to the characteristic impedance of the line(50 ohms). The length of the positioning piece is factory selected for the frequency band of operation. Refer to table 2-1 for part number and length.

1.2.7 Balun.- The balun is a 180E line section that hangs directly under the center of the antenna insidethe pedestal and is used to develop a balanced signal output from a coaxial line input.

1.2.8 Pedestal.- The antenna pedestal is a 6061-T6 aluminum tube with mounting plates on each end. The pedestal supports the Alford loop antenna and provides a conduit for feed cables, the 180E balun,positioning piece, and the tuning stub.

1.2.9 Radome.- The radome is a cone-shaped, fiberglass enclosure that protects the radiating elementsof the antenna from the weather and vermin infestation.

1.2.10 Counterpoise.- The counterpoise is a circular, metallic support structure that is made ofaluminum or galvanized steel and is assembled in segments that are bolted together. It is typicallybetween 60 and 120 feet in diameter and is elevated 8 to 20 feet above ground level.

1.2.11 Field Monitor Antenna.- Refer to figure 1. There is one field monitor antenna in each DVORsystem. The field monitor antenna is a single Yagi antenna that is installed on a support tower 300 to600 feet from the carrier antenna. It may be installed on any radial. Typically, the field monitor antennais not located on an important radial (such as an approach radial).


Rev. A April, 1993 1-7

Figure 1-6. DVOR Field Monitor Yagi Antenna.


1-8 Rev. A April, 1993

1.3 EQUIPMENT SPECIFICATION DATA.- The equipment specification data is listed in table 1-1.

Table 1-1. Equipment Specification Data.

Equipment Manufacturer: Airport Systems International, Inc.

Equipment Model and Type: Model 1150 DVOR Antenna

Frequency range: 108-118 MHz

Polarization: Horizontal

Characteristic impedanceof feed cables: 50 ohm

Environmental: Temperature range: -50EC to +70EC

Relative Humidity: 0 to 95% non-condensing

Cone of Silence: 37.5 to 42.5 degrees from vertical

1.4 EQUIPMENT SUPPLIED.- Table 1-2 is a list of all major equipment supplied.

Table 1-2. Equipment Supplied.

Quantity Description Part Number

1 Doppler Antenna Kit (48 Antenna) 470165-0001

1 Civil Installation Kit Rohn Antenna 470252-0001



1.5 EQUIPMENT REQUIRED BUT NOT SUPPLIED.- Table 1-3 is a list of all equipment that is notsupplied, but is required to make the antenna operational, or to install the antenna.

Table 1-3. Equipment Required But Not Supplied

Quantity Description Manufacturer Part No.

1 Vector Voltmeter, Hewlett Packard Model 8405A1 Signal Generator,1 BNC adapters, Hewlett Packard HP10218A1 Multimeter, Fluke Model 832 50 Ohm Terminations, Type N Bird

1.6 OPTIONAL EQUIPMENT.- Table 1-4 contains a list of the optional equipment for the DVORAntenna system.

Table 1-4. Optional Equipment.

Quantity Description Part Number

1 Stand Alone DVOR Carrier Antenna Kit 470209-00011 Carrier Antenna Kit with Walk-in Radome 470208-00011 Doppler Field Monitor Kit 470178-00011 Doppler Field Monitor Kit 470178-0002


1-10 Rev. A April, 1993




SECTION 2. TECHNICAL DESCRIPTION

2.1 INTRODUCTION.- This section contains a simplified theory of operation of the Alford loop antennaand a detailed theory of operation of the DVOR antenna system.

2.2 SIMPLIFIED THEORY OF OPERATION.- The Alford loop antenna emits a horizontally polarizedwave. The horizontal radiation pattern, in free space, from a single horizontally polarized Alford loop isomni-directional and the vertical pattern is bi-directional.

Each dipole has a wide radiating surface making the Alford loop antenna more efficient than other loop typeantennas with smaller radiating surfaces. A signal with opposite phases is applied to the center of thedipoles via a crossover connection (balun). This causes the currents in the folded-back portions of theelements to contribute very little to the radiated field, since the currents are in opposite directions and tendto cancel each other. This also causes the current flow in the radiating faces of the loop to be in the samedirection, either clockwise or counter-clockwise depending on the point in the RF cycle. Each radiating face,being the midsection of a 1/2 wavelength element (approximately), has a current amplitude that varies froma maximum at the center of the radiating surface to approximately 70 percent of maximum at the ends ofthe radiating surface, refer to figure 2-1.

The slight non-uniformity of current amplitude does not destroy the circularity of the pattern because, atpoints oriented near the corners of the loop, such as point P in figure 2-2, some radiation is also receivedfrom an adjacent face. Consequently, the loop behaves as if the current were nearly constant in all portionsof the radiating faces and the radiating pattern is approximately the same as that of a small circular loop.The Alford loop is generally mounted so that the loop is contained in a plane parallel to the ground, it hasa non-directional horizontal radiation pattern and a figure-of-eight vertical radiation pattern.

The two dipoles attached with a crossover require a balanced feed. This is accomplished by attaching a halfwave-length balun between the two feed points. The purpose of the half-wave-length balun is to developthe equivalent of a balanced signal source output from a coaxial line input, which is inherently unbalanced.With a balun in place, either feed point can be fed with an unbalanced line.

In theory, the unbalanced feed point impedance is 300 ohms resistive at the resonant frequency and theimpedance departs from 300 ohms as frequency varies across the VOR band. This variation is sufficient tocause a substantial mismatch to the transmitter at this point when not tuned correctly. For this reason, animpedance matching network is required.

Inside the Alford loop antenna is a glass or an air-dielectric metal disc tuning capacitor (depending on theantenna). The tuning capacitor is located in the center of the dipoles near the feed point. The tuningcapacitor does not change the resonant frequency of the antenna, but does effect the impedance match of theantenna.



The input impedance of the Alford loop antenna was measured over the 108 MHz to 118 MHz VOR bandwhile varying the tuning capacitors from maximum to minimum capacitance. The results, plotted on aSmith Chart, showed the tuning capacitor to have the same effect on impedance as frequency variation. Inaddition, the impedance plot was a circle centered on an impedance of 50 ohms resistance in parallel with30 ohm inductance.

To match the antenna, the antenna input impedance must be 50 ohms at the operating frequency. Thesimplest means to match the antenna is to select a point on the input coax where the impedance equals 50ohms resistive in parallel with some value of reactance. At that point, a reactive stub (tuning stub) isinserted between the RF cable and the antenna connector. This is accomplished by using a positioning pieceand type N Tee connector. The tuning stub is then trimmed to tune out the reactance, yielding a matched50 ohm impedance to the transmitter.

The tuning stub length has a profound effect on the VSWR. It is cut for minimum VSWR at one frequency.The tuning capacitors are then used to impedance match the antenna for a better than 1.10:1 VSWR.

The proper match cannot be obtained over the full 10 MHz operating bandwidth with one positioning piecelength between the antenna input and the type N Tee. Therefore, the positioning piece is factory selectedfor the band of operation (see table 2-1).

Table 2-1. Positioning Piece Part Number and Length for DVOR Frequencies

Frequency Part Number Length

108 - 110 MHz 070350-0001 16.75 inches111 - 114 MHz 070350-0002 12.0 inches115 - 118 MHz 070350-0003 8.75 inches



Figure 2-1. Approximate Current Distribution for Each Element of theAlford Loop Radiator.

Figure 2-2. Diagram of an Alford Loop Antenna Showing CurrentDirections in One of the Four Half-Wave Elements.



2.3 DETAILED THEORY OF OPERATION .- The DVOR antenna system simulates a rotating arm witha transmitting antenna at each end, radiating the upper sideband signal from one end and the lower sidebandsignal from the other end. This is achieved electronically by using 48 antennas spaced equally around theperimeter of a circle 44 feet (13.4 meters) in diameter, with an antenna in the center of the circle radiatinga reference carrier.

Consider the effect of simulated antenna rotation on an airborne receiver. When the upper sideband sourceis moving toward the aircraft, the doppler effect causes the airborne receiver input frequency to becomehigher than fc+9960 Hz, and for the lower sideband source, which is moving away, the frequency becomesless than fc+9960 Hz, fc being the carrier frequency. The frequency difference changes sinusoidally due tothe simulated rotation. The difference is maximum when the line joining the two radiating antennas isperpendicular to the radial to the aircraft. The difference is equal to zero when the two sideband sourcesalign with the radial to the aircraft since, at that moment, the distance between each sideband source and thereceiver does not vary.

The moment of zero frequency deviation is different for different positions of the aircraft around the station.Therefore, the recovered 30 Hz FM signal will have a different phase for each of these different positions.For the receiver North of the DVOR station, the 30 Hz FM signal must be in phase with the 30 Hz AMsignal; both signals passing through their positive zero crossings at the same time. To achieve this, thefollowing has to be observed: At the moment that the 30 Hz amplitude modulation of the carrier is passingthrough its positive zero crossing, the simulated rotating antennas shall align with antenna number 1 (atNorth) and antenna number 25 (at South), with the North antenna radiating the lower sideband and the Southantenna radiating the upper sideband. The lower sideband frequency will be decreasing; the upperincreasing. The subcarrier frequency will be increasing from exactly 9960 Hz up and the 30 Hz FM signalwill be passing through its positive zero crossing.

The relationship between the Doppler induced frequency modulated 30 Hz variable signal and the 30 Hzamplitude modulated carrier for receivers spaced around the DVOR station is best illustrated by figures 2-3through 2-7. Generation of the azimuth-dependent FM by a DVOR station is depicted in figure 2-3. It isassumed that the distance from the antenna array, shown as points A (sideband antenna) and M (referenceantenna), to the aircraft receivers, shown as R1 and R2, is very much larger than the diameter of the array(distance D) and that, at the beginning of antenna array commutation, the antenna at the northern most pointof the array is radiating an upper sideband signal. Since the lower sideband signal is similar to that of theupper sideband signal, only the upper sideband signal will be discussed.

Antenna (signal) A traverses around antenna M in a counterclockwise direction. Four specific locations forantenna A are marked (positions 1, 2, 3, and 4). The rotation of antenna A with respect to antenna M causesreceiver R1 to detect a variable signal that leads the reference signal by 270E. Receiver R2, however, isdetecting a variable signal that leads the reference signal by 180E. Figure 2-4 is a vector representation ofthe FM and AM phase relationship at eight points about a DVOR station.



Figure 2-3. Generation of Azimuth-Dependent FM by a DVOR Station.



Figure 2-4. Phase Relationship of DVOR Course Forming Signals.



Figure 2-5 depicts aircraft receivers A, B, C, and D at the four cardinal points of a DVOR station. Shown,too, is the instantaneous direction of a rotating RF source at those points. Figure 2-6 is an illustration of thesignals recovered by aircraft receivers A, B, C, and D. At the beginning of array commutation, aircraftreceiver A perceives a radiating source moving to the west. Because at this instant (t = 0) the distancebetween receiver A and the radiating source is neither increasing nor decreasing, aircraft receiver A willrecover an FM subcarrier which has no frequency deviation. The FM subcarrier has a frequency of 9960Hz at this instant. A quarter of an antenna array commutation cycle later (t = 1/120 sec), the radiating pointsource is at the western most point of the array and is moving away from aircraft receiver A to the south atits greatest speed. From the Doppler effect, the FM subcarrier is frequency deviated downward by itsmaximum extent of 480 Hz. The FM subcarrier has a frequency of 9480 Hz at this instant (t = 1/120 sec).When the antenna array commutation has gone through one half of its cycle (t = 1/60), aircraft receiver Aperceives a radiating point source at the southern most point of the array and moving directly east. At thistime, the distance between the radiating source and the aircraft receiver is neither increasing nor decreasing;therefore, there is no Doppler induced frequency deviation of the FM subcarrier. The variable FM subcarrierhas a frequency of 9960 Hz at this instant.

When the antenna array is commutated through three-fourths of its cycle (t = 3/120 sec), aircraft receiverA now perceives a radiating point source at the eastern most point of the array and moving toward it at itsmaximum speed. The Doppler effect frequency deviates the variable FM subcarrier upwards by itsmaximum extent of 480 Hz. The variable FM subcarrier has a frequency deviation of 10,440 Hz at this time.A further one quarter cycle of antenna array commutation brings the point source back to its northern mostpoint and the process repeats. The variable FM subcarrier is detected in aircraft receiver A and is output asthe detected 30 Hz FM variable signal. Aircraft receiver A also detects the 30 Hz amplitude modulatedcarrier and outputs a detected 30 Hz reference signal. The received reference AM signal and the detected30 Hz AM reference are identical for receivers A, B, C, and D. An analysis similar to that for receiver A,but from the viewpoint of receivers B, C, and D yield the remaining variable FM subcarrier and detected 30Hz FM variable waveforms shown in figure 2-6. Aircraft receiver D has a bearing of 90E and from figure2-6 it can be seen that the detected 30 Hz FM variable signal leads the reference by one-quarter cycle, or 90E.Similarly for aircraft receiver C, the variable signal leads the reference by one-half cycle, or 180E, and thebearing of receiver C is 180E. Receiver B has a bearing of 270E and the variable signal leads the referenceby three-fourths cycle or 270E. Aircraft Receiver A has a bearing of 0E and its two signals are in phase.

The method of inducing the Doppler shift in the sideband is demonstrated by figure 2-7. Again, for thepurpose of this discussion, radiation from only one sideband element is assumed.

For an observer located North of the DVOR station, the Doppler shift is most pronounced when the Westand East antennas are radiating. No Doppler shift is present when the North and South antennas areradiating. With a counterclockwise rotation of the antenna, antenna #12 would emit RF energy and 1/1440of a second later, antenna #13 would emit RF energy. Figure 2-7 shows the distance that each wave fronthas traveled in some unit length of time. The separation of the two wavefronts is equal to distance d1. Afew moments later, antenna #36 is turned on causing it to emit RF energy. At 1/1440 of a second later,antenna #37 is conducting and radiating RF energy.



After the same time period as before with antennas #12 and #13, the separation of the two wavefronts ismeasured and found to be distance d2. It is readily seen that d1 » d2. The distance of separation can beequated to time as the signals propagate through space; i.e., the time required for Emax of each successivewave front to pass the observer. The reciprocal of time is frequency (1/t = f).

Figure 2-5. Instantaneous Direction of an RF Sourcewith Respect to Aircraft Receivers A, B, C and D.



Figure 2-6. Received and Detected AM and FM Signalsby Aircraft Receivers A, B, C, and D.

Due to the counterclockwise rotation of the sideband radiating elements, the western antenna would producea Doppler shifted frequency that was less than the fundamental frequency (9960 Hz - 480 Hz). The easternantenna would produce a frequency greater than the fundamental frequency (9960 Hz + 480 Hz). Thenorthern and southern antennas would produce no shift.



Figure 2-7. Doppler Shift (Wave front Measurement).Refer to table 2-2 and figure 2-8. It might be wrongly assumed that because the upper and lower sidebandsare radiating from oppositely paired antenna (e.g., upper sideband on #12 and lower sideband on #36) thatthe two sidebands are producing opposite Doppler shifts. It is true that the fundamental sideband frequencyis shifted downward (fUSB-480 Hz) when movement is west of the station and shifted upward (fLSB+480 Hz)when rotation is east of the station. However, after heterodyning, it can be seen that both the upper andlower sidebands are shifting in the same direction; i.e., from 9960 Hz to 9480 Hz, for the example given.(Heterodyning is the process of mixing two frequencies together in order to produce two other frequenciesequal to the sum and difference of the first two.)



Table 2-2. Doppler Shift Values from Heterodyning

Upper Sideband (USB)

fUSB fc

East: 108010440 - 108000000 = 10440 Hz

No/So: 108009960 - 108000000 = 9960 Hz

West: 108009480 - 108000000 = 9480 Hz

West of the station the upper sideband frequency shifts from 108.009960 MHz to108.009480 MHz or, after heterodyning, from 9960 Hz to 9480 Hz.

Lower Sideband (LSB)

fLSB fc

East: 107990520 - 108000000 = 9480 Hz

No/So: 107990040 - 108000000 = 9960 Hz

West: 107989560 - 108000000 = 10440 Hz

East of the station the lower sideband frequency shifts from 107.990040 MHz to107.990520 MHz or, after heterodyning, from 9960 Hz to 9480 Hz.



Figure 2-8. Doppler Shift (Heterodyning).



SECTION 3. OPERATION

3.1 INTRODUCTION.- After initial installation and adjustment of the DVOR antenna, no operatingprocedures are required. Refer to DVOR system manual (571150-0002) for system operating procedures.



SECTION 4. STANDARDS AND TOLERANCES

4.1 INTRODUCTION.- Not applicable to this manual.



SECTION 5. PERIODIC MAINTENANCE

5.1 INTRODUCTION.- This section contains performance checks and other preventive maintenance thatmust be performed periodically. Refer to table 5-1 for a list of activities to be preformed on a recurringbasis.

Table 5-1. Maintenance Intervals.

Semi- ReferenceStep Description Quarterly Annual Annual Paragraph

1. Site Inspection T T T 5.3.1

2. Inspection ofAntenna System T 5.3.2

3. Inspection ofField Monitor T T T 5.3.3

5.2 PERFORMANCE CHECKS.- There are no assemblies that require performance checks.

5.3 OTHER ONSITE MAINTENANCE.- Table 5-2 contains a list of other onsite maintenance proceduresthat are necessary to ensure the DVOR antenna system is functioning properly.

Table 5-2. Other Onsite Maintenance.

Reference Paragraph or Table

Standards and MaintenanceVisual Inspections Tolerances Procedures

1. Site Inspection - Verifysite inspection has been N/A 6.3.1preformed.

2. Antenna System Inspection -Verify antenna inspection N/A 6.3.2has been preformed.

MODEL 1150 DVOR ANTENNAMODEL 1150 DVOR ANTENNAMODEL 1150 DVOR ANTENNAMODEL 1150 DVOR ANTENNA


Table 5-2. Other Onsite Maintenance (Cont).

Reference Paragraph or Table

Standards and MaintenanceVisual Inspections Tolerances Procedures

3. Field Monitor Inspection -Verify field monitor N/A 6.3.3inspection has been preformed

5.4 OFFSITE MAINTENANCE.- There are no assemblies that require depot (offsite) periodic overhaulor calibration.



SECTION 6. MAINTENANCE PROCEDURES

6.1 INTRODUCTION.- This section contains replacement and tuneup procedures for sideband and carrierantennas and RF cables.

6.2 PERFORMANCE CHECK PROCEDURES.- There are no assemblies that require performance checks.

6.3 OTHER MAINTENANCE PROCEDURES.-

6.3.1 Site Inspection.- Site inspections may be preformed with the transmitter on, although walking on thecounterpoise to remove obstructions may cause an alarm condition. Inspections to the antenna system(6.3.2) should be done with the DVOR transmitter off. Consult proper airport authority before taking theDVOR station off the air.

a Check that the site is clear of any new obstructions or materials which could affect the normaloperation of the DVOR system.

b. Check the shelter, inside and out, for any sign of water filtration, damage, or other deterioration.

c. Check the condition of the air conditioner, shelter lighting, obstruction lights, baseboard heaters,electrical outlets, etc.

d. Check for and remove any accumulation of snow, ice, or debris on the field monitor antenna.

e. Check for and remove any accumulation of snow, ice or debris on the counterpoise surface.

6.3.2 Inspection of the Antenna System.-

a. Assure that both DVOR transmitters are turned off.

b. With radomes removed, inspect the mating areas of the radomes where they connect with the antennapedestal. Check for any signs of water leakage or deterioration. Repair or replace as necessary.

c. Inspect the antenna elements for any signs of water damage or corrosion. Repair or replace asnecessary.

d. Remove access cover located on antenna support pedestal. Without removing cables, check theinput cables and connectors for breaks, cracks, or corrosion. Check that the connectors are securelyfastened. Check cables for vermin damage, loose or broken tie wraps, etc. Replace as necessary.



e. Inspect the remaining parts of the antenna for signs of vermin infestation, corrosion, water damage,etc. Repair as necessary.

f. Inspect the counterpoise for any signs of deterioration, paying special attention to welded joints,bolted connections, mesh, etc. Check for proper electrical connection between the counterpoisesegments and grounding connections. Repair as necessary.

g. Replace access covers and antenna radomes.

h. Remove any articles carried onto the counterpoise.

6.3.3 Inspection of Field Monitor Antenna.-

a. Inspect the condition of the field monitor antenna. Make sure it is solidly mounted and that all nutsand bolts are tightened.

b. Inspect the condition of the field monitor antenna coaxial cables and tie wraps, for signs of cracksor breakage. Replace if necessary.

6.4 SPECIAL MAINTENANCE PROCEDURES.- There are no assemblies that require specialmaintenance procedures.



SECTION 7. CORRECTIVE MAINTENANCE




SECTION 8. PARTS LIST

8.1 INTRODUCTION.- This section contains the parts lists used in DVOR Antenna system. Table 8-1 liststhe parts supplied in the Doppler Antenna kit; table 8-2 contains a list of the parts supplied in the StandAlone DVOR Carrier Antenna Kit; table 8-3 contains a list of the parts supplied in the Carrier Antenna withWalk-in Radome Kit; table 8-4 contains a list of the parts supplied in the Civil Installation Kit, RohnAntenna; table 8-5 contains a list of parts supplied in the Doppler Field Monitor kit (470180-0001); table8-6 contains a list of parts supplied in the Doppler Field Monitor kit (470180-0002).

Table 8-1. Doppler Antenna Kit (48 Antenna)(470165-0001)Refer to figure 11-1.

Qty Part Number Description Item No.

48 080001-0001 Doppler Sideband Antenna Assy. 148 950394-0001 Sideband Antenna Radome Assy. 248 070350-9999 Positioning Piece (Specify Freq.) 348 950392-0001 Sideband Antenna Pedestal 448 701784-0001 Sideband Antenna Pedestal Access Cover 5200 321070-0000 1" Beam Clamp 6210 136000-0079 1/4-20 x 1/2" Machine Screw 7200 302044-0000 2" Retaining Strap 8350 327079-0000 3/8-16 x 1-3/4" Machine Bolt 9700 137000-0814 .406 x .812 x .065 Flat Washer 10350 136504-0141 3/8" Lock Washer 11350 321014-0000 3/8-16 Hex Nut 12200 302097-0000 Screw Mount Cable Tie 13215 136504-0139 1/4" Lock Washer 14300 137002-0014 .395 x .750 Slotted Washer 1598 180303-0001 Type-N Connector 162400 ft. 443060-0001 1/4", 50 ohm, RF Cable 1748 135230-0000 Type-N Adapter 1848 070351-0001 Tuning Stub 1948 070352-0001 Sideband Antenna Balun 201 900065-0000 Sealing Compound 10.5 oz. 211 900115-0001 Gold Tube Type Marker 221 900115-0002 Black Tube Type Marker 23100 302102-0595 Tiedown Strap 2448 185209-0000 UG-27C, Plug Jack Connector Adapter 25200 327601-0000 10-32 x 1/2" Machine Screw 26200 136504-0138 No. 10 Lock Washer 27



Table 8-2. Stand Alone DVOR Carrier Antenna Kit.(470209-0001)

Qty Part Number Description

1 080001-0001 Doppler Sideband Antenna Assy.1 950394-0001 Sideband Antenna Radome Assy.1 250392-0001 Antenna Pedestal1 070352-0001 Sideband Antenna Balun1 070351-0001 Tuning Stub1 185230-0000 Type-N Adapter1 185209-0000 UG-27C, Plug Jack Connector Adapter1 070350-9999 Positioning Piece (Specify Freq.)8 137000-0814 .406 x .812 x .065 Flat Washer8 327079-0000 3/8-16 x 1-3/4" Machine Bolt8 136504-0141 3/8" Lock Washer8 321014-0000 3/8-16 Hex Nut4 137002-0014 .395" x .750" Slotted Washer50 ft. 443060-0001 1/4", 50 ohm, RF Cable2 180303-0001 Type-N Connector6 327601-0000 10-32 x 1/2" Machine Screw6 136504-0138 No. 10 Lock Washer

Table 8-3. Carrier Antenna Kit with Walk-in Radome(470208-0001)


1 080002-0001 Doppler Carrier Antenna Assy5 327025-0008 1/4-20 x 2" Machine Bolt5 137000-0810 .281 x .625 x .065 Flat Washer7 137501-0011 1/4-20 Hex Nut2 327024-0021 3/8-16 x 5" Machine Bolt4 327025-0012 1/4-20 x 3" SST. Machine Bolt1 070352-0001 Sideband Antenna Balun1 070351-0001 Tuning Stub1 185230-0000 Type-N Adapter1 185209-0000 UG-27C, Plug Jack Connector Adapter8 137000-0814 .406 x .812 x .065 Flat Washer8 327079-0000 3/8-16 x 1-3/4" Machine Bolt8 136504-0141 3/8" Lock Washer8 321014-0000 3/8-16 Hex Nut4 137002-0014 .395" x .750" Slotted Washer



Table 8-3. Carrier Antenna Kit with Walk-in Radome (Cont)(470208-0001)


50 ft. 443060-0001 1/4", 50 ohm, RF Cable2 180303-0001 Type-N Connector1 801774-0001 Doppler Antenna Pedestal Cable Duct4 801738-0001 Carrier Antenna Mounting Spacer Rod2 801737-0001 Carrier Antenna Spacer Block Clamp2 701798-0001 Carrier Antenna Special Half Clamp1 070350-9999 Positioning Piece (Specify Freq.)

Table 8-4. Civil Installation Kit Rohn Antenna (470252-0001)(Refer to figure 9-11)


1 950181-0000 3-1/2' Rohn SB25G Tower 11 900076-0000 3/4" x 10' Copper Clad Steel Ground Rod 215 ft. 146006-0000 No. 6 AWG Copper Wire 31 900130-350 Conduit, MN, Rigid, 1" x 5' PVC 4

Table 8-5. Doppler Field Monitor Kit (470178-0001)(Refer to figure 9-13)


15 ft. 146006-0000 No. 6 AWG Copper Wire --1 347015-0000 Ground Rod Splice conductor --1 400049-0000 Terminal Lug MP11 900076-0000 3/4" x 10' Copper Clad Steel Ground Rod MP22 950180-0000 Rohn 25G 10 Foot Tower MP32 302090-0000 2" Flat Back Saddle Clamp MP510 900082-0000 Rigid Metal Conduit MP74 347003-0000 1-1/8" O.D Retaining Strap MP92 900084-0006 1-5/8" x 1.5' Structural Channel MP101 950304-0000 Yagi Horizontal Polarized Antenna Assy MP161 180316-0000 1.20" x 0.44" TNC Connector10 302043-0000 Black Tiedown Strap8 137000-0814 .406 x .812 x .065 Flat Washer4 136504-0141 3/8" Lock Washer



Table 8-5. Doppler Field Monitor Kit (Cont).(470178-0001)


4 321014-0000 3/8-16 Hex Nut4 327060-0000 3/8-16 x 1-1/4" SST. Hex Head Cap Screw1 180303-0001 Type-N Connector350 ft. 434060-0001 1/4", 50 ohms, RF Cable

Table 8-6. Doppler Field Monitor Kit (470178-0002)(Refer to figure 9-14)


400 ft. 443060-0001 1/4", 50 ohm, RF Cable 12 950180-0000 Rohn 25G 10 Foot Tower 21 400049-0000 Terminal Lug 31 180316-0000 1.20" x 0.44" TNC Connector 430 302043-0000 Black Tiedown Strap 51 950304-0000 Yagi Horizontal Polarized Antenna Assy 61 180303-0001 Type-N Connector 71 950180-0003 Rohn 25AG2 10' with 2-1/4" O.D. Pipe 8



SECTION 9. INSTALLATION, INTEGRATIONS, AND CHECKOUT

9.1 INTRODUCTION.- This section contains the information required to install the antenna equipment,inspect the installation, perform startup and preliminary testing procedures, and perform an installationverification test.

9.2 UNPACKING AND REPACKING.- Packing cases are to be handled and opened with care to avoiddamage to electronics components. Be certain all fasteners, supports, and tie-downs have been removedbefore attempting to remove the units. Inspect all items for shipping damage and check against the packingslip to insure complete shipment. Check the packing slip against table 1-2.

9.3 TEST EQUIPMENT REQUIRED.- Refer to table 1-3 for a list of test equipment that is required forinstallation.

Table 9-1. Equipment Required for Installation but not Supplied.

Quantity Description

1 Theodolite 1 Electric Drill 4 Vise Grip Type Clamps 1 3/8 inch Transfer Punch 4 3/8 inch Drill Bits

9.4 INSTALLATION.-

9.4.1 Sideband Antenna Installation.- The sideband antennas must be mounted on a radius of 22 feet fromthe center of the counterpoise and evenly spaced at 7.5E intervals. They must be uniform in height andaligned with the carrier antenna which is mounted at the center of the counterpoise. There are two methodsused in locating the sideband antennas on the counterpoise mounting rail: the theodolite method and the tapemeasure and spirit level method. The theodolite method is preferred as precision and accuracy insure abetter signal in space.



9.4.2 Theodolite Method.- Refer to figure 9-1.

a. Unpack and set up Theodolite in the center of the sideband mounting rail.

b. Using a compass identify magnetic North (0E) and mark it on mounting rail.

Figure 9-1. Antenna Spacing on Counterpoise Mounting Rail Using Theodolite.



c. Unpack all 48 sideband antenna pedestals. Scribe a line in the center of the antenna pedestal baseon the same side as the access panel.

d. Locate the North (0E) point on mounting rail with theodolite. Set theodolite scale to 0E.

e. Rotate the theodolite 7.5E and mark this point on mounting rail. Rotate theodolite another 7.5E andmark this point on mounting rail. Continue this procedure all the way around the mounting rail untilyou arrive back to the 0E mark.

f. Evenly space all 48 sideband antenna pedestals (Part No. 950392-0001) on the mounting rail usingthe scribe marks to locate position. The antenna pedestals should have their access panels facingtowards the center of the array.

g. Insure the sideband antenna pedestal number 1 is exactly centered on the North (0E) line of themounting rail as seen from the center of the array.

h. Check antenna pedestal position using theodolite.

i. If position is correct, clamp sideband antenna pedestal to mounting rail using four vise grip type (orequalivant) clamps.

j. Using a 3/8 inch transfer punch, mark the mounting rail where the four mounting hole are to bedrilled.

k. Drill four 3/8 inch holes in mounting rail.

l. Using the theodolite and .395" x 3/4" slotted washers (Part No. 137002-0014), as shims, levelsideband antenna pedestal vertically and horizontally.

m. Attach sideband antenna pedestal #1 to counterpoise mounting rail, using appropriate hardware, asshown in figure 9-2.

n. Rotate throdolite 7.5E and check position of the next sideband antenna pedestal. If position is correctattach sideband antenna pedestal to mounting rail as detailed in steps i thru m.

o. Continue to the process of checking the position of the sideband antenna pedestals, clamping themto the mounting rail, drilling the mounting holes, and bolting them to the mounting rail until all thesidebnad antenna pedestals have been securely attached to the mounting rail.

p. Make sure sideband antenna orientation is correct as shown in figure 9-1, attach sideband antennaassembly (Part No. 080001-0001) to sideband pedestal using appropriate hardware.



Figure 9-2. Antenna Placement on Mounting Rail.



q. The antennas must radiate in line with their respective radial; that is, every other antenna must be180 degrees out from the other, refer to figure 9-1. At the same time, insure that the slot of theAlford loop antenna is on a radial with the center of the array.

r. Place antenna radomes (Part No. 950394-0001) on sideband antennas to protect the radiatingelements in case of inclement weather.

9.4.3 Tape Measure and Spirit Level Method.-

a. Using a compass identify magnetic North (0E) and mark it on counterpoise mounting rail. Make sureyou are standing far enough away from the counterpoise so the steel in its construction will notinterfere with the compass.

b. Using a compass identify South (180E) and mark it on counterpoise mounting rail.

c. Using a compass identify East (90E) and West (270E) and mark them on counterpoise mounting rail.

d. Refer to figure 9-3. Evenly space all 48 sideband antenna pedestals (Part No. 950392-0001) on themounting rail. The antenna pedestals should have their access panels facing towards the center ofthe array.

e. Place the first sideband antenna pedestal, sideband antenna #1, exactly centered on the North lineof the support rail as seen from the center of the array.

f. Measure 34.53 inches from North line (0E point on counterpoise) and mark this point oncounterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #2, on this point.

g. Using the North line as a starting point and while adding 34.53 inches to each perviousmeasurement, measure and mark locations for sideband antennas #3 through #13 on counterpoisemounting rail. Thus, sideband antenna #3 would be 69.06 inches from North line, sideband antenna#4 would be 103.59 inches from North line, and sideband antenna #5 would be 138.12 inches fromNorth line, etc.

h. Locate the South line as previously marked (in step b.) on counterpoise mounting rail. Placesideband antenna pedestal, for sideband antenna #25, exactly centered on this point as seen from thecenter of the array.

i. Measure 34.53 inches from South line (180E point on counterpoise) and mark this point oncounterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #24, on this point.



j. Using the South line as a starting point and while adding 34.53 inches to each perviousmeasurement, measure and mark locations for sideband antennas #23 through #14 on counterpoisemounting rail. Thus, sideband antenna #23 would be 69.06 inches from South line, sideband antenna#22 would be 103.59 inches from South line, and sideband antenna #21 would be 138.12 inchesfrom South line, etc.

k. Measure 34.53 inches from North line (0E point on counterpoise) and mark this point oncounterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #48, on this point.

l. Using the North line as a starting point and while adding 34.53 inches to each perviousmeasurement, measure and mark locations for sideband antennas #47 through #37 on counterpoisemounting rail. Thus, sideband antenna #47 would be 69.06 inches from North line, sideband antenna#46 would be 103.59 inches from North line, and sideband antenna #45 would be 138.12 inchesfrom North line, etc.

m. Measure 34.53 inches from South line (180E point on counterpoise) and mark this point oncounterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #26, on this point.

n. Using the South line as a starting point and while adding 34.53 inches to each perviousmeasurement, measure and mark locations for sideband antennas #27 through #36 on counterpoisemounting rail. Thus, sideband antenna #27 would be 69.06 inches from South line, sideband antenna#28 would be 103.59 inches from South line, and sideband antenna #29 would be 138.12 inchesfrom South line, etc.

o. Clamp sideband antenna pedestal #1 to mounting rail using four vise grip type (or equalivant)clamps.

p. Using a 3/8 inch transfer punch, mark the mounting rail where the four mounting hole are to bedrilled.

q. Drill four 3/8 inch holes in mounting rail.

r. Using a carpenter's level and .395" x 3/4" slotted washers (Part No. 137002-0014), as shims, levelthe sideband antenna pedestals vertically and horizontally.

s. Attach sideband antenna pedestal #1 to counterpoise mounting rail, using appropriate hardware, asshown in figure 9-2.

t. Attach sideband antenna pedestal #2 to mounting rail as detailed in steps o thru s.

u. Continue to the process of clamping sideband antenna pedestals to the mounting rail, drilling themounting holes, and bolting them to the mounting rail until all the sidebnad antenna pedestals havebeen securely attached to the mounting rail.

v. Attach sideband antenna assembly (Part No. 080001-0001) to sideband pedestal using appropriatehardware.



Figure 9-3. Antenna Spacing on Counterpoise Mounting Rail UsingSight and Measurement.



w. The antennas must radiate in line with their respective radial; that is, every other antenna must be180 degrees out from the other, refer to figure 9-3. At the same time insure that the slot of the Alfordloop antenna is on a radial with the center of the array.

x. Place antenna radomes (Part No. 950394-0001) on sideband antennas to protect the radiatingelements in case of inclement weather.

9.4.4 Carrier Antenna Installation.- Refer to figures 9-2 or 9-4 as applicable.

a. Place carrier antenna pedestal in the center of the counterpoise.

b. Attach carrier antenna mast to counterpoise, using appropriate hardware

c. Using a carpenter's level or a theodolite and .395" x 3/4" slotted washers (Part No. 137002-0014)as shims, level the carrier antenna mast vertically and horizontally.

Figure 9-4. Carrier Antenna Pedestal Installation Diagram.



9.4.5 Cutting Antenna Feed Cables to Proper Electrical Length.-

a. Measure and cut 49, fifty foot lengths of RF antenna cable.

b. Install type-N connector (Part No. 180303-0001) on one end of the RF feed cable as detailed infigure 9-5.

Figure 9-5. RF Connector Assembly Diagram.


9-10 Rev. A April, 1993

c. Label antenna cables at both ends using a tube type marker (Part No. 900115-0001). Label one cablewith a "C" to indicate carrier antenna cable. Label the remaining cables 1 through 48, this willindicate which sideband antenna the cable will go to.

d. Connect vector voltmeter, signal generator, and bi-directional coupler as detailed in figure 9-6.

Figure 9-6. Equipment Setup for Cutting RF Cables to Proper Electrical Length.

e. Set signal generator to operating frequency of station, 0 dB output.

f. Find the electrically shortest cable and calibrate the vector voltmeter to 0E on that cable.

g. Trim all remaining cables to within 2E of the cable used in calibration.


Rev. A April, 1993 9-11

h. Install type N-connector on the other end of RF feed cables as detailed in figure 9-5.

i. Recheck the phase length of each RF feed cables to insure uniform length. Tag the RF cable withthe shortest electrical phase length. The tag should include the phase length of the cable and theoperating frequency it was checked at. This cable will be used as a reference in case an RF feedcable fails in the future.

j. Route RF feed cables to their respective antennas.

k. Connect RF feed cable, positioning piece, tuning stub, and RF Tee connector as shown in figure 9-7.

l. Connect 180E balun to antenna connectors J2 and J3.

Figure 9-7. Diagram of RF Feed Cable, Tuning Stub, RF Tee Connector, and Positioning Piece Connections.

9.4.6 Tuning the Antennas.-

a. Using an ohmmeter, check all 50 ohm dummy loads. Replace those that are not 50 ohms ±1 ohm.

b. Connect bi-directional coupler, vector voltmeter, signal generator, 50 ohm dummy loads, and Teeconnectors as shown in figure 9-8.


9-12 Rev. A April, 1993

Figure 9-8. Equipment Setup for Calibrating Vector Voltmeter for 0E.

c. Set signal generator to operating frequency of the DVOR station with an output of 0 dB.

d. Calibrate vector voltmeter for 0E.

e. Connect bi-directional coupler, vector voltmeter, signal generator, 50 ohm dummy loads, and Teeconnectors as shown in figure 9-9.


Rev. A April, 1993 9-13

Figure 9-9. Equipment Setup for Tuning the Antennas.

f. Connect antenna 1's RF feed cable to the bi-directional coupler. Dummy load the opposite sides ofthe antennas; antenna 48 would be dummy loaded as well as antenna 2. This will prevent reflections.

g. While monitoring the vector voltmeter for VSWR and with a person on the counterpoise check theVSWR of antenna 1. Adjust the tuning capacitor for a VSWR of 1.10 or lower. If the capacitor willnot bring the antenna's VSWR within specifications it may be necessary to trim the antenna tuningstub.

h. If trimming the antenna tuning stub is necessary trim approximately 1/8 to 1/4 of an inch each time.After trimming tuning stub adjust tuning capacitor to determine if the antenna's VSWR will drop to1.1 or below.

i. Connect bi-directional coupler to feed cable for antenna number 2 and dummy load the feed cablesfor antenna numbers 1 and 3.

j. Tune antenna number 2 as detailed in steps g and h.


9-14 Rev. A April, 1993

k. Repeat steps f thru h for sideband antennas 3 and 4 remembering to dummy load adjacent antennasto prevent reflections.

l. Once sideband antennas 1 through 4 have been tuned, recheck the previously tuned antennas toinsure VSWR has not changed. This step is necessary because the sideband antennas react with eachother. Retune antennas as necessary.

m. Tune sideband antenna numbers 5 through 8 periodically rechecking previously tuned antennas.Continue this process until all sideband antennas have been tuned.

n. Connect RF carrier antenna cable to bi-directional coupler.

o. Adjust tuning capacitor or air-dielectric capacitor (depending on antenna) for a VSWR reading of1.1. If the capacitor will not bring the antenna's VSWR within specifications it may be necessaryto trim the antenna tuning stub.

p. If trimming the antenna tuning stub is necessary trim approximately 1/8 to 1/4 of an inch each time.After trimming tuning stub adjust tuning capacitor to determine if the antenna's VSWR will drop to1.1 or below.

9.4.7 Adjusting Phase Length of Sideband Antennas To Carrier Antenna.-

a. Connect bi-directional coupler, vector voltmeter, signal generator, 50 ohm dummy loads, and Teeconnectors as shown in figure 9-10.

b. Set signal generator to operating frequency of the DVOR station with an output of 0 dB.

c. Calibrate vector voltmeter for 0E using the feed cable to sideband antenna 1 as a reference.

d Measure and record the phase length of each sideband antenna in relation to the carrier antenna.

e. Determine the mean phase length of the sideband antenna RF feed cables. All sideband antennasmust be within 10E of each other.


Rev. A April, 1993 9-15

Figure 9-10. Test Equipment Setup for Sideband Antenna to Carrier Antenna Phasing.

f. Trim sideband antenna RF feed cables or add elbows to antenna RF feed cables that are out oftolerance.


9-16 Rev. A April, 1993

9.4.8. Field Monitor Antenna Foundation Installation.- Refer to section 8 parts list, for a complete list ofmaterials inclused in the Civil Installation Kit Rohn Antenna (Part No. 470252-0001). Figure 9-11 showsa typical DVOR Field Monitor Antenna foundation installation. DVOR Field Monitor Antenna foundationinstallation may vary per local building codes.

9.4.9 Field Monitor Antenna (470178-0001) Installation.- Refer to section 8 parts list, for a complete listof materials included in the single Doppler Feild Monitor Antenna Kit (part no. 470178-0001). Figure 9-12shows a typical DVOR field monitor antenna and tower.

a. Refer to figure 9-13. Set a 10 foot tower section (MP3) on foundation tower section (MP4, buriedin concrete). Insure that bottom of tower is down. Secure the two sections together with sixmachine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20). Insure that terminallug (grounding strap) (MP1) is attached to the tower. Attach the No. 6 AWG Copper Wire (part no.146006-0000) to the tower terminal lug and the ground rod (MP2).

b. Set the last 10 foot tower section (MP3) on second tower section (MP3). Insure that bottom of toweris down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers(1 x 1/4"), and hex nuts (1/4-20).

c. Secure three moisture caps (MP19) to the tower top.

d. Secure the two unistrut mounting rails (MP10) to top of tower with clamps (MP9) as shown. Beforetightening the top rail, insure that rail is level and centered.

e. Install two clamps (MP5) and U-bolts (MP8) to Unistrut mounting rails (MP10) using U-bolts (MP8)and appropriate attaching hardware, do not tighten.

f. Assemble the single Yagi antenna assembly (MP16) per instructions supplied with the antenna.Install clamps, U-bolts, and attaching hardware to the antenna boom clamp, do not tighten.

g. Install EMT pipe (MP7) and secure with clamps (MP5) and U-bolts (MP8).

h. Slide the antenna on to the EMT pipe (MP7) and secure with U-bolts supplied with the antenna.

i. After antenna is secured, secure the antenna boom cap (MP6).


9-18 Rev. A April, 1993

THIS SHEET IS INTENTIONALLY


Rev. A April, 1993 9-19

Figure 9-12. Typical DVOR Field Monitor Antenna and Tower (Part No. 470178-0001).


9-20 Rev. A April, 1993

j. Using the appropriate hardware attach clamps (MP11 and MP12) to tower (MP3) as shown.

k. Assemble weather protection collar (MP13), conduit (MP15), 90 degree conduit elbow (MP17), andconnector (MP18), then secure to tower clamps (MP11). After conduit is attached to tower, connectconduit (MP15) to 90 degree conduit elbow (MP17) using connector (MP18).

9.4.10 Field Monitor Antenna (470178-0002) Installation.- Refer to section 8 parts list, for a complete listof materials included in the Doppler Feild Monitor Antenna Kit (part no. 470178-0002). Refer to figure 9-14.

a. Set a 10 foot tower section (2) on foundation tower section, buried in concrete. Insure that bottomof tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flatwashers (1 x 1/4"), and hex nuts (1/4-20). Insure that terminal lug (grounding strap) (3) is attachedto the tower. Attach the No. 6 AWG Copper Wire (part no. 146006-0000) to the tower terminal lug.

b. Set the last 10 foot tower section (2) on first tower section (2). Insure that bottom of tower is down.Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"),and hex nuts (1/4-20).

c. Set the top tower section (8) on second tower section (2). Insure that bottom of tower is down.Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"),and hex nuts (1/4-20).

d. Assemble the single Yagi antenna assembly (6) per instructions supplied with the antenna. Installclamps, U-bolts, and attaching hardware to the antenna boom.

Figure 9-13. DVOR Field Monitor Antenna and Tower (Part No. 470178-0001)Parts Location Diagram

Model 1150 DVOR Antenna

Rev. A April, 1993 9-23

Figure 9-14. DVOR Field Monitor Antenna and Tower (Part No. 470178-0002) Parts

Location Diagram


9-24 Rev. A April, 1993

THIS SHEET IS INTENTIONALLY BLANK



SECTION 10. SOFTWARE



Rev. A April, 1993 11-1

SECTION 11. TROUBLESHOOTING SUPPORT DATA

11.1 INTRODUCTION.- This section contains parts location illustrations for the DVOR antenna array.Table 11-1 contains a list of assembly and installation drawings necessary to install the DVOR antenna array.

Table 11-1. Assembly and Installation Diagrams.

Description Drawing Number Figure Page

Assembly, DVOR Antenna Kit 470165 11-1 11-3


11-2 Rev. A April, 1993


vor antenna

Documents

airport systems international

dvor antennarev

revision highlightspages

latest revision

revised pages

issue page

record of revisions

streetoverland park