engïnïsliting supplement - americanradiohistory.com · 2019. 7. 17. · effective radiated tower...
TRANSCRIPT
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 .
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
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.
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.
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
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.
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.
a
a
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EXHIBIT NO. I
COVERAGE MAP
e,,
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1.4tYf.thYl:I<II' } PV: 1, 1: ,,
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1000W/m < .i . ,-J , ,
- t'" ' . .. '^,1 - 6 I
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RANSMITTER SITE " "6,..,
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5000
1000
4000
3000
2000
1000
6000
5000
3000
2000
10, 1000
Ti
_
elevations tgbuÍátél from
'U.S. Geolorical Survey Topot hÿ
'C,uadrenclP Sheets. i-1 i
IT,
5 6 7 8 9 IO
DISTANCE IN MILES
KEUFFEL & ESSER GO. N Y.
6000
5000
4 000
3000
2000
1000
o
6000
5000
4000 r 9:! o.01. ' " 3 000 M r
2000 en
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A11 elevRtions tabulRte-' fr,,m U.:,. Geoi..4x -1 Survey ibpoRrb -hy ..uNcirf+rrle Sher.L-
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3 4 5
MILES
e 9 IO hEUFFF I 8 t SSE Fe CO N y
WU
»6000
5000
4000
. 3000
2000
1000
300
200
100
At -,-
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All elevations tabulated from U.S. Geological Survey Topography +.;uadr>gn .ìe Sheets.
H f
PACIFIC GCEAN
i . 0 15 16 17 18 19 20 21 22 23 24 25 26 27 28
M ILE S
KEUFFea. aSSER CO. N3 0
c vvv
a 5000
4000
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DANGER AREA
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GRADIENT OF
abons are ,n fee, ac -e r ear, ea ,Evel Contour Interval 1000 feet
FL
'TATUM 10 Mfl
3
NEWHALL //Po
SANTA MONICA.
O'34-
45
jh -
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e 4
17
-$9
Houses
Lake Hughes
Top of row., er. 60f
"41141444S2T
San Pedro (ISPV 3'
/-4249°
AVY) ro
AN«, ARIA // CATALINA Avalon
2.1 126 n
o
Lancaster
LF
PAIRDALE 414Y AIR FIE
(holdings
ri 4141iiilli
ALMAN RA grammes gwriliWatal 42v-
L
884 1 1
t
268 ,
e,
GREY PUTT NO 4
3050
347 126 1
\ Pi eitingten
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IOnI j;e1.ona
MarN
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ERO 3
1
Lag». reach
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AN TA A
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s
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ICRAGE NO
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ARM ORVILLE AIR FIELD'
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ington
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Lake .%luthews
OC EA NS ID
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EXHIBIT NO. 3
AERONAUTICAL CHART
East
-
Redlands 3
Yuca'
ly 7 Belem/
Lake.
1',/uevo
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te coo
Temecula ci
Fallbrook
Bon sali
CANCER A A
17"P Valley Center
T W
8- u '
Nth
\s ,
50 uvim Camp.
)447446 45
WiTer
4-0*E1/4, 78 126 I
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<<:, TRANSMITTER SITE
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Psudssu SAN FA . A T
BBAOWAT
ANACONDA
TO r!!N
KWKW
EXHIBIT NO. 4
. .N!
Fase 13-14 EXHIBIT #5
AERIAL PHOTOGRAF HS
TRANSMITTER SITE
, TRANSMITTER SITE
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~h 1ÌitdiiÌ % Illelar®11i!enlnI:.':
C.mu,ur inGTvu1250 feet . 1.dm a is mean sea level.
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.
a 42......41.40ALÜL..:.
coU2oreIgt et "to IIA uz1.3ar yd bell.77mot egm
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?lee 17 ',YTTI1TT 8
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
r e,Aev..!
"
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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
8/ eign, TV-IETZ,
beuelJno0
ibeise.Ztrioo)10 TTvLiaS01012VA 10 KO ITiklUVa
allasem
aa
oon .)8e3e;
MIZ1412
a f: a 4,
O8
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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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