Engineering Copy

7 1_3/

ENGINEERING SUPPLEMENT

AMENDED APPLICATION

KFAC-FM

BY

LOS ANGELES BROADCASTING COMPANY, INC.

OF

LOS ANGELES, CALIFORNIA

INDEX TO ENGINEERING SUPPLEMENT

PAGE

General Engineering Statement 1 2

Method of Determing Area and Population Served 3

Qualification Sheet 4

Affidavit 5

Coverage Map - Exhibit 1, Figure 1 6

Profile Graphs - Exhibit 1, Figure 2-A, 2-B 7 - 8

Topographic Map - Exhibit 1, Figure 3 9

Map Showing Character of Area and other 10 Radio Stations

Exhibit 1, Figure 4

Map Showing Location of KFAC Main Studio and 11 Transmitter

Exhibit 1, Figure 5

Vertical Drawing of Antenna - Exhibit 2, Figure 6 12

Aerial Photograph - Exhibit 2, Figure 7 13

U.S.G.S. Hollywood Quadrangle Sheet, Exhibit 2, 14

Horizontal Plan KFAC Transmitter Property, 15 Exhibit 2, Figure 9

Exhibit No. 1 pertains to FCC 'orm 301, Section V -B Exhibit No. 2 pertains to FCC Form 301, Section V -G

-1 -

ENGINEERING STATEMENT

The engineering data contained in this supplement

refers to the application by the Los Angeles Broadcasting Co...

Inc. for a modification of Construction Permit, File No. BMPH--

3097, call letters KFAC-FM.

It is requested that permission be granted to chan,-

the transmitter location from:

34 Degrees, 13 minutes, 47 seconds North Latitude

118 Degrees, 04 minutes, 06 seconds West Longitude

to

34 Degrees, 01 minute, 10 seconds North Latitude

118 Degrees, 20 minutes, 48 seconds West Longitude

The coverage requested in this application is for

3009 square miles within the fifty microvolt contour and an

effective antenna height of 191.6 feet.

It is proposed to utilize a 3000 watt transmitter

operating at full output. The coaxial transmission line will

be 619 feet long. The manufacturer's rated efficiency for 619

feet of 1 5/8 inch line is 73.5%. .1 four section Collins ring

antenna having a rated power gain of 4.1 will be used. The

effective rated power is then (3.0)(.735)(4.1) or 9.0405

kilowatts.

It is proposed to use the 370 foot high west tower

of the present KFAC directional antenna to support the FL

antenna. The center of the FM antenna will be 355 eet above

ground level and 1455 feet above mean sea -level.

-2 -

The preceding figures of 9c0) K`1 at 455 feet

above sea -level were used in determining the location of the

contours shown as Figure 1. The contours were located using

the method outlined in the Commission's Standards of Good

Engineering Practice Concerning FM Broadcast Stations. It

should be pointed out that the contours on radials A and H are

shown to be at zero distance since the terrain rises to give

negative effective elevation. In the present interim operation

of KFAC-FM from the same site as proposed in this application,

good service is supplied to the crest of the Hollywood Hills,

a distance of about seven miles and all within line of sight

from the transmitter.

The FM line is taken across the base insulator and

carried up the inside of the tower for a quarter -wave at the

AM frequency to isolate the line at 1330 KC. The completo FM

installation has been made and is in 24 hour operation for

interim FM service. The adjustment of the directional antenna

has been approved by the Commission.

The profile graphs shown as Figure 2 were drawn

using elevations obtained from U.S.G.S. quadrangle Sheets,

Scale 1/24,000.

METHOD OF DETERMINING AREA AT\TD POPULATION SERVED

The areas within the 1000 and 50 uv/m contours

were measured with a planimeter.

The areas are as follows:

1000 uv/m contour - 720 square miles

50 uv/m contour - 3009 square miles

The population to be served within the predicted

contours was estimated by drawing the contours on a

U.S. Minor Civil Division Map, census of 1940. When

a contour cut through a Minor Civil Division, the popu-

lation within the division was assumed to be uniform.

Cities having populations in excess of 10,000 persons

and were within the 50 uv/m contour but outside the

1000 uv/m contour were not considered as receiving service.

The number of persons receiving service as determined by

the above method is as follows:

1000 uv/m contour - 2,196,529

50 uv/m contour - 2,329,12O

The actual number of houses was determined within

0.5 and 0.25 miles of the transmitter. Using a factor

of 3.2 persons per house the population is as follows:

lithin 0.25 miles - 272 persons

Mithin 0.5 miles -1772 persons

(tALIFICATION SHEET

The engineering material herein contained,

and the engineering information contained in the

accompanying F.C.C. Form 301, were prepared under

the direction of Mr. Ron Oakley, 2785 Cedar Avenue,

Long Beach, California. Mr. Oakley is Chief Engineer

of the Los Angeles Broadcasting Company, Inc., and

is California Registered Electrical Engineer No. 3196.

Mr. Oakleyts qualifications arc a matter

of record with your Commission, having been accepted

in many previous AM and FM applications, sky wave

and ground wave field intensity measurements, antenna

resistance measurements, and directional antenna proof

of performance reports.

STATE OF CALIFORNIA )

SS: COUNTY OF LOS ANGELES)

Ron Oakley, being duly sworn, upon

his oath deposes and says that the facts stated in

the foregoing, together with the exhibits attached

thereto, are true of his own knowledge, except as

to such statements as therein stated to be on infor-

mation and belief, and as to such statements he believes

them to be true.

Ron Oakley (Affiant)

Sworn and subscribed before me this day of

1949.

Notary Public

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