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ENGïNïsLitING SUPPLEMENT for APPLICATION FOR PROPOSED P M BROADCASTING S TATI ON by LOS ANOELES SROA.DCA:3TI10G CO., INC. of Loa Angeles, Cal if .

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Page 1: ENGïNïsLitING SUPPLEMENT - americanradiohistory.com · 2019. 7. 17. · effective radiated tower wee u2ed with the new e.e.e. 2e3 'lc Charts to lecate the one teeueand microvolt

ENGïNïsLitING SUPPLEMENT for

APPLICATION FOR PROPOSED P M BROADCASTING S TATI ON

by LOS ANOELES SROA.DCA:3TI10G CO., INC.

of Loa Angeles, Cal if .

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2,11E8X TO ENGIN'iRINe ngum

General ,j..lvim9.6ring iitent

Metliod ,J1kting yjír Contours

Ur13IT :.ACE

1, 2

3, 4

Method of liti n, Lepulation und Area :srvlbd 5

Contour ap 1 6

Profile Grapha

Aeronautical L:hurt

2142B 2C,2D

3

6,7, 8,9,10

11

Transmitter jiwa and Known 7i -adio Stations 4 12

Aerial Photoraphs 5 13-14

Topographic !Jap 6 15

(dialification Sht3et 7 16

Tabulation 1 Avera¡ie Llevations 8 17,16

Tgibulation of ;:)itanles to PrcJdicted Uootours 19

daviL ln 20

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Ya7e 1.

GENERAL ENGINEERING CTAMMENT

The Engineering data contained in this supplement

refers to the application by the L,s Ans.el es Broadcasting Company,

Inc., of Los Angeles, California, for a construction permit for a

High Frequency Broadcast Station using Frequency Modulation.

The station will have its Main Studio at 645 South

Mariposa Avenue, in Los Angeles.

The Transmitter is to be located on a mountain north-

east of Pasadena, California. The exact location of the trans-

mitter will be at

34 degrees 12 minutes ,3.8 second North Latitude

118 degrees 4 minutes 14 seconds West Longitude.

The transmitter site is in the :Mount ;;"ilson area of the ..an labriel

4lountains at an elevation of 4300 feet above mean sea level.

The coverage requested in this application is for 10,760

square miles within the 50 uv/m con toi_ r as based on average

elevation prediction mes -hods. when "line of sight" conditions are

met, the coverage is estimated at 7,240 square miles w ithin the

50 uv/m meter contour.

It is proposed to use a thousand watt transmitter operat-

ing with one thousand watts output. It is assumed that the trans-

mitter and antenna will be so located that the coaxial transmission

line will be 100 feet long. The manufacturer's rated efficiency

of a line of this length is 93%, thus 930 watts will de cielivered

to the antenna. A six bay turnstile antenna is proposed uvinz- a

field gain of two. The effective power radiated thus will be

3,720 watts.

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i'ae Y.

It is prepoeed to support the turnstile anteena on

a self-sueportine steel derrick fifty feet hieh. The radiat-

ine elements are teenty-five feet eient inches high aee weee

feur feet of elearance at the bottom, and one foot tee ifl3[IB

at he top, the over-all heient is thus eiehty-one feet eleehe

ielhes. The height froel te ereend to the center ee eee

radiatiee elements is thus stety-one feet aeove he round

level, and 4367 feet above mear sea level.

fhe ereceedine figures of 3720 watts o power at an

elevetion of 43G7 feet above :lean sea level weru used in coe-

putin the expected covera e.

There are three airports within ton elles of the pro-

posed transmitter site. The distances and bearinee fro tee

transmitter site follow:

Monrovia Airport 5.5 miles at 1400 true.

El Monte Airport 8.0 miles at 1580 true.

Tosemead Aireore 9.5 miles at 1800 true.

The proposed site is 18 miles from the center of ren

airay N. 5, and 19 miles from tee center of weber airwae N.

1. (Airports and. Airways are shown on xhibit eo.3).

Twe etanard eroadcast 3tatioes are lthin ebeht miles

of the proposed transmitter site. They are eeeC and KWKW, both

located in SCesaena, ealifornia. The weather station of the

e.e.Theieeers, eCeJ, also is within eieht miles of the proposed

'21-lere are no ldines or markires for air navleation

he vicleity of the site.

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eace 3

VETHOD OF. ESIMIZATING SERVICE CONTOURS

The method outlined in the Commission's 'Yrozosed

.tan lards of Good .enElneeriee H-actice Concernine F

Broadcast 'etetIons, Jul- 2e, U45, W6.3 used for estieating

the service contours.

laevations ear° 'aeon alon ten radiale from the

transmitter site. These elevations were tabulated from

3.Geoloeical eurvey Topogreehic aps havine a scale of

1/24,000.

The averaee elevation of the twe to ten mile

sector on each radial ra calculated and sübtracted froe

the transmitter antenna height. 2he effective heieht

of the transmitter antenna thus ebtained and the

effective radiated tower wee u2ed with the new e.e.e.

2e3 'lc Charts to lecate the one teeueand microvolt per

meter and fifty microvolt nor meter aontours.

or the averaee elevation for adial A in the

two to ten mile sector was calculated, it was found that

the eff ctive elevation of the antenna w as necative.

This indicated zero sienal to tee earth and inspection

of hadlal A eeows teat this is probably the case siece

the mountain rises to :ore than five theeeand feet in

this direction. "Line of eight" transeibigion is possible

in this direction for a distance of only 1.5 miles.

"Line of nieht" transmission occurs for only .5

milee alone Radial e, b.4 alene hadial C, and 2.65 miles

al n eadial J. Since the terrain Is verei irreeular wì

centaine deep caeyons aloe eedials C, and tes,

avereee elevation predletioe eethozi indtetes a good sienal

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coverine quite a luree area in tease directions. Any ser-

vice received ale; adials A, 0, or J woull be several

hu. .:rd feet below the "lineo sieht." ihere ie practically

no populatien involved In teese areas aril tee only questiee

is in the matter of square miles covered. Lehleit eo. I

shove the service area as predicted by tee elevation

method and tee dotted line is an approximate line eheee

the transmission eocomee "lene of silet" to the predicted

contours.

eeriebit eo. 3 so ee only the centours as predicted

by tne averle:e elevation method.

oblique aerial photoeraph of exhibit No. 5 shoes

the transmitter location ane. the ridge of ..nouetalne Jirecte

ly to tee north of the proposed site. The observer is look -

in e northeast to the transmitter site.

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j

METHOD OF Je.TViMININC FOPULTION AN AEU 3ERVED

The aroa within the 1000 and 50 uv/m contours for

both predicted and limited service areas shown in Exhibit

Eo. I was measured it a planimeter. 'ileac areas are as

follows:

Uevation Prediction sthod.

1000 uv/M contour 5,000 square miles

50 uv/uz contour 10,760 square miles

Uevation i'rediction -Jethod less area lefinitely out of line of iht.

1000 uv/M contour 4,240 square miles

50 uvf-J contour 7,240 square miles

ihe population within the predicted contours was

estimatod by drawn, the contours on a U.;G. inor Civil

jivision .:ap. Uniform distribution of population was

assumed when one of the contours passed thro10) a civil

division. Populations follow:

ay UovnUon 'rediction Method.

1000 uvill contour 3,003,389 persons

50 uv/m contour 3,061,572 persons *

hj Elevntion .rediction .10thod loss area efinitely out of line of 914?Ilt.

1000 uv/m contour 2,2,2eG persons

50 uv/ m contour 3,045,763 persons *

* Cities of over 10,000 persons within the 50 uv/m co tour

and outsile the 1000 uv/m contour excl uded.

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EXHIBIT NO. I

COVERAGE MAP

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elevations tgbuÍátél from

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'C,uadrenclP Sheets. i-1 i

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5 6 7 8 9 IO

DISTANCE IN MILES

KEUFFEL & ESSER GO. N Y.

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All elevations tabulated from U.S. Geological Survey Topography +.;uadr>gn .ìe Sheets.

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PACIFIC GCEAN

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M ILE S

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Fase 13-14 EXHIBIT #5

AERIAL PHOTOGRAF HS

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TRANSMITTER SITE

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, TRANSMITTER SITE

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age 16 EXBIBiT #7

QUALIFICATION SHEET

All of the enJlnearing hifermation contained in

application was compiled by Trzl üakley, 2785 Cedar Ave.,

Lnnj 72each, 3alif-rnia.

clualifications follow:

'1,evious or presented to we accepted by

your (7ommisaion.

Entered radio as amateur in 1924, roceivin

call letters GJA. .Lctive as amateur operator

until U31 during Which time also worked in

rc:lio service and set manfacturin,.

Lntered commercial radio broadcasting in 1931

and employed (371tinuously since then in he

radio broadeastine

L:xperience IncluAs transmitter and studio con-

s field strenE,th measurements, sky -wave

measurements, and esin anj adjustment of

dircctional anterna system. Appointed KGLJ

trannetter supervisor in 1937 and has been

L,nincer of ).fl since tebruary 1943.

ormal eduction at Leach Polytechnic A.gh

chool and tle jr1 ersity of bouthern jalUernla.

Member of the Institute of fidio Lneneers.

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TABULATION OF AVERAGE ELEVATIONS

INTERVAL ADIAL RADIAL RADIAL RADIAL RADIAL RADIAL RADIAL RADIAL OF SECTOR A C D B F G H

NOL 45E N90E N110E N135E N180E N225ì N245E

0 to 1 mile 5900 1400 4100 3760 3000 3200 3600 3480

1 to 2 4800 4400 3780 3060 2940 2000 1840 2100

2 to 3 4520 4000 2700 2720 1460 1000 1050 1220

3 to 4 3820 3300 3080 2000 760 780 950 1220

4 to 5

t 5 to 3

4740

5120

3040

3300

4100

4260

2000

1700

610

505

570

500

875

360

1070

970

6 to 7 4115 4100 3260 2320 120 430 860 910

7 to 8 3620 4080 2560 2380 435 360 700 1360

8 to 4135 4120 2790 146c 435 300 560 1100

9 to 10 4370 5700 2300 780 430 250 50 7,1J0

- 10 to 11" 620

11 to 12 rt 400

12 to 13 " 300

13 to 14 2A)

14 to 15 305

15 to 16 250

16 to 17 220

17 to 18 180

18 to 19 " 160

19 to 20 " 140

00 to 21 n 140

21 to 44. n, 170

22 to 23 130

23 to 24 " 110

24 'Go '" 102

r).5 to 26 100

26 to 27 120

27 to 23 118

to 96

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Page 18 EXHI T 8 Continued

INTERVAL OF STM011.

TABULATION OF AVERAGE ELEVATIONS (continued)

RADIAL RADIAL

N270E N315E

0 to 1 mile 3600 3300

1 to 2 miles 2360 35B0

2 to 3 it 2180 4960

3 to 4 n 1600 4650

4 to 5 " 1440 4650

5 to 6 II 1220 3900

5 to 7 n 1260 3620

7 to B " 1270 3680

8 to 9 " 1380 3500

9 to 10 tt 1200 2760

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Pet,e 19 9

RADIAL

TABUUTION 3-17TXUCUI, TO PREDICTED CONTUIliS

7,Istance to 50 uv/m Contour

Dietance to 1000 uv/m Coto,2T

Effective Antenna Elevation

-41liated

A 0 0 -0.5 ft. 3720 watts

8 50 miles 19.5 miles 350 lf tt 3720

C 70.5 it 35.0 tt 1236 3720 "

J0.0 44.0 " 2447 " 3720 "

it 105.0 60.5 3687 t t 3720

tf 107.0 " 61.03720 3843 ei t/

O 104.0 0 60.0 0 3553 " 3720 "

H ....58.032893720 101.0 " " " "

I 97.0 " 54.00 " 2723 " 372 U CI

J. 51.0 " 22.0 11 414 ti 3720. "

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STATE OF C.1.I.SI°'OF:idI1'. )

) SS: COUNTY OF LOS ANU,:L:S)

Pon Onkley, being duly sworn, upon his oath

e3pnoses and. days that the facts stated in the- foregoing,

together 17th al/ the exhibits attached thereto, are true

of his own knorledge, except as to such statements am

therein stated to be on inforrir.t1 on and hei 1_ef, and PO

to such statements he believes them to be true.

Sworn and subscribed before me this _2,7 - , 1945.

My commission expires

day ,-,p

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