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mImanatmI

N-6573

FM-1H

1KW

FM

TRANSMITTER

HARRIS

INTERTYPE

CORPORATION

a A

TES!

WARRANTY

Seller

warrants

new

equipment

manufactured by

Gates

Radio

Company

against

defects

in

material

or

work-

manship

at

the

time

for

delivery

thereof,

that

develop

under

normal

use

within

a

period

of

one

year

(6

months

on

moving

parts)

from

the

date

of

shipment,

of

which

Purchaser

gives

Seller

prompt

written

notice.

Other

manufacturers'

equipment,

if

any,

including

electron

tubes,

and

towers

shall

carry

only

such

manufacturers'

standard

warranty.

Seller's

sole

responsbility

for

any

breach

of

the

foregoing

provision

of

this

contract,

with

respect

to

any

equipment

or

parts

not

conforming

to

the

warranty

or

the

description

herein

contained,

is

at

its

option,

(a)

to

repair

or replace

such

equipment

or

parts

upon

the

return

thereof

f.o.b.

Seller's

factory

within

the

period

aforesaid,

or

(b)

to

accept

the

return

thereof

f.o.b.

Purchaser's

point

of

installation,

whereupon

Seller

shall

either

(1)

issue

a

credit

to

Purchaser's

account

hereunder

in

an

amount

equal

to

an

equitable

portion

of

the

total

contract

price,

without

interest,

or

(2)

if

the

total

contract

price

has

been

paid,

refund

to

Purchaser

an

equitable

portion

thereof,

without

interest.

If

the

Equipment

is

described

as

used,

it

is

sold

as

is

and

where

is.

If

the

contract

covers

equipment

not

owned

by

Seller

at this

date

it

is

sold

subject

to

Seller's

acquisition

of

possession

and

title.

Seller

assumes

no

responsibility

for

design

characteristics

of

special

equipment

manufactured

to

specifications

supplied

by

or

on

behalf

of

Purchaser.

Seller

shall

not

be

liable

for

any

expense

whether

for

repairs,

replacements,

material,

service

or

otherwise,

incurred

by

Purchaser

or

modifications

made

by

Purchaser

to

the

Equipment

without

prior

written

consent

of

Seller.

EXCEPT

AS

SET

FORTH

HEREIN,

AND

EXCEPT

AS

TO

TITLE,

THERE

ARE

NO

WARRANTIES,

OR

ANY

AFFIRMATIONS

OF

FACT

OR

PROMISES

BY

SELLER,

WITH

REFERENCE

TO

THE

EQUIPMENT,

OR

TO

MERCHANTABILITY,

INFRINGEMENT,

OR

OTHERWISE,

WHICH

EXTEND

BEYOND

THE

DE-

SCRIPTION

OF

THE

EQUIPMENT

ON

THE

FACE

HEREOF.

RETURNS

AND

EXCHANGES

Do

not

return

any

merchandise

without

our

written

approval

and

Return

Authorization.

We

will

provide

special

shipping

instructions

and

a

code

number

that

will

assure

proper

handling

and

prompt

issuance

of

credit.

Please

furnish

complete

details

as

to

circumstances

and

reasons

when

requesting

return

of

mer-

chandise.

Custom

built

equipment

or

merchandise

specially

ordered

for

you

is

not

returnable.

Where

return

is

at

the

request

of,

or

for

the

convenience

of

the

customer,

a

restocking

fee

of

15%

will

be

charged.

All

returned

merchandise

must

be

sent

freight

prepaid

and

properly

insured

by

the

customer.

When

writing to

Gates

Radio

Company

about

your

order,

it

will

be

helpful

if

you

specify the

Gates

Factory

Order

Number

or

Invoice

Number.

WARRANTY

ADJUSTMENTS

I;

In

the

event

of

equipment

failure

during

the

warranty

period,

replacement

or

repair

parts

may

be

provided

in

accordance

with

the

provisions

of

the

Gates

Warranty.

In

most

cases

you

will

be

required

to

return

the

defective

merchandise

or

part

to

Gates

f.o.b.

Quincy,

Illinois

for

replacement

or

repair.

Cost

of

repair

parts

or

replacement

merchandise

will

be

billed

to

your

account

at

the

time

of

shipment

and

compensating

credit

will

be

issued

to

offset

the

charge

when

the

defective

items

are

returned.

MODIFICATIONS

Gates

reserves

the

right

to

modiry

the design

and

specifications

of

the

equipment

shown

in

this

catalog

without

notice

or

to

withdraw

any

item

from

sale

provided,

however,

that

any

modifications

shall

not

ad-

versely

affect

the

performance

of

the

equipment

so

modified.

4

e

INSTRUCTIONS

FOR

INSTALLING

AND

OPERATION

OF

GATES

FM-1H,

1

KW

TRANSMITTER

•

I B -

888

0960

001

GATES

RADIO

COMPANY

QUINCY,

ILLINOIS

•

le

•

i)

FM

HARMONICS

IN

THE

TV

BAND

The

sharp

upsurge

in

FM

broadcasting

has

in

some

instances

developed

unlooked

for

interference

with

local

TV

reception.

In

every

instance

this

interference

is

in

so-called

fringe

areas

for

TV

reception

and

where

the

strength

of

the

TV

signal

is

weak

enough

that

outside

highly

directional

home

TV

antennas

are

necessary.

When

this

condition

develops,

the

TV

viewer

quickly

learns

from

his

service

man

that

the

local

FM

station

is

the

offender.

----

The

FM

broadcaster

is

immediately

deluged

with

requests

to

eliminate

the

interference.

In

some

instances

CATV

(Community

Antenna

Television)

systems

are

also

offended

as

they

pick

up

weak

distant

TV

stations.

-----

What

is

the

FM

broadcaster's

responsibility?

Answer:

To

meet

FCC

rules

and

regulations

as

related

to

harmonic

radiation

of

his

FM

equipment

but not

to

guarantee

perfect

TV

reception.

Below

is

a

chart

showing

the

picture

and

sound

frequencies

of

TV

stations

between

Channels

7-13

inclusive.

Channels

2-6 are

not

shown.

FM

harmonics

do

not

fall

in

these

Channels.

In

fact,

commercial

FM

station

harmonics

will

affect

only

Channels

8

and above

----

look

at

the

chart.

TV

Channel

Picture

Frequency

Band

---Mc---

Sound

Frequency

7

175.25

to

179.50

8

181.25

to

185.50

9

187.25

to

191.50

10

193.25

to

197.50

11

199.25

to

203.50

12

205.25

to

209.50

13

211.25

to

215.50

197.75

185.75

191.75

197.75

203.75

209.75

215.75

The

frequency

range

for

commercial

FM

broadcasting

is

92.1

Mc

to

107.9

Mc:

---

To

determine

the

second

harmonic

of

your

FM

frequency,

just

multiply

your

frequency

by

2.

Example:

If

your

frequency

is

99.9

Mc,

multiplied

by

2

would

make

a

second

harmonic

of

199.8

Mc.

By

consulting

the

above

chart,

you

will

note

the

second

harmonic

falls

in

the

picture

portion

of

the

TV

Channel

11.

Correct

FM

Harmonic

Radiation

The

FCC

stipulates

that

transmitters

of

3000

watts

power

and

over

must

have

a

harmonic

attenuation

of

80

db.

For

1000

watts,

73

db.,

and

for

250

watts,

66.9

db.

All

reputable

manufacturers

design

their

FM

transmitters

to

meet

or

exceed

these

specifications.

Fringe

Area

TV

Strength

Versus

FM

Harmonics

Let's

take

a

typical

FM

station

that

radiates

70,000

microvolts

per

meter

at

1

mile.

At

80

db.

harmonic

attenuation

(as

called

for

by

FCC),

this

station

will

radiate

approximately

7

microvolts

per

meter

at

1

mile on

the

second

harmonic.

In

the

case

of

our

Channel

11

example,

it

is

estimated

that

a

fringe

area

TV

station

from

60

to

90

miles

distance

would

have

a

signal

strength

of

from

5

to

25

microvolts

per

meter.

It

can

then be

easily

understood

that

a 7

microvolt

signal,

well

within

FCC

specifications,

would

definitely

interfere

with

the

TV

signal,

yet

with

the

FM

broadcaster's

equipment

performing

normally.

This

is

sometimes

further

aggravated by

the

FM

station

being

located

between

the

TV

station

and

the

TV

receivers.

In

this

instance

the

TV

antennas

are

focussed

not

only

on

the

TV

station

but

yoür

FM

station

as

well.

The

home

TV

antennas

are

beamed

at

your

legal

second

harmonic

as

well

as

the

fringe

TV

station.

What To

Do

When

interference

occurs,

it

will

develop

ragged

horizontal

lines

on

the

TV

picture

varying

with

the

FM

program

content.

If

the

TV

sound

portion

is

interfered

with

(usually

not

the

case),

then

the

FM

signal

will

be

heard

in

addition

to

the

TV

sound.

1.

It

is

not

up

to

the

FM

broadcaster

to

go

on

the

defensive.

He

did

not put

the

TV

station

75

miles

away

nor

did

he

select

the

TV

Channel.

----

In

most

instances

the

condition

is

a

natural

phenomena

that

neither

you,

the

TV

station,

nor

the

FCC

can

correct.

2.

Do

not

adjust

the

FM

harmonic

or

"T"

notch

filters

supplied

with

the

FM

transmitter.

These

are

factory

adjusted

and

most

FM

stations

do

not

have

the

expensive

equipment

necessary

for

correct

adjustment.

Tampering

with

this

calibrated

adjustment

will

probably

make

the

condition

worse.

3.

Do

not

rely

on

TV

service

men's

types

of

measuring

equipment.

They

are

not

built

to

accurately

measure

harmonics

and

invariably

give

erroneous

readings

that

invite

the

CATV

or

local

service

men's

association

to

say

"I

told

you

so."

Remember

it

is

difficult

to

radiate

harmonics

if

the

equipment

is

built

to

suppress

the

harmonics

and

it

is.

4.

In

many

instances

interference

may

be

caused

by

overloading

on

the

front

e

ri

of

the

TV

receiver.

This

problem

usually

occurs

when

the

receiver

is

located

close

to

the

FM

transmitter.

This

problem

can

be

overcome

by

installing

a

trap

tuned

to

the

frequency

of

the

FM

carrier.

The

TV

service

r

an

can and

must

learn

how

to

do

this.

In

most

cases

it

works,

while

in

,me

instances,

if

not

properly

installed

or

tuned,

it

will

not

completely

eliminate

the

interference.

In

one

case

where

interference

of this

type

existed,

a

TV

station

put

traps

for

the

fundamental

FM

frequency

on

nearly

every

TV

set

in

town.

Not

the

FM

transmitter.

Summary

The

FCC

is

well

acquainted

with

this

nation-wide

problem.

If

TV

viewers

write

FCC,

complaining

about

your

FM

station,

remember

the

FCC

has

received

a

few

thousand

similar

letters.

It

is

not the

obligation

of

the

FM

broadcaster

to

assure

fringe

area

reception

of

a

TV

station

any

more

than

is

the

obligation

of

the

TV

statirsn

to

assure

the

FM

broadcaster

perfect

reception

in

his

TV

city.

Probably

your

installation

will

not

have

problems

as

outlined

above.

If

they

do

exist,

don't

blame

the

equipment.

Every

transmitting

device

puts

out

a

second

harmonic,

even

the

TV

stations.

The

fact

that

these

harmonics

legally

fall

into

the

spectrum

of

a

TV

station

many

miles

distant

is

coincidental,

but not

your

fault.

•

Gates

Radio

Company

e

•

FM-1

.H 1

KW

FM

TRANSMITTER

TABLE

OF

CONTENTS

SECTION

1 -

GENERAL

DESCRIPTION

PAGE

1.1

Warranty

and Safety

Notice

1

1.2

Purpose

of

Book

1

1.3

Purpose

of

Equipment

1

1.4

Description

2

1.5

Technical

Data

2

1.6

Vacuum

Tube

Table

3

SECTION

2 -

INSTALLATION

2.1

Inspection

3

2.2

Packing

Check

List

4

2.3

Installation

4

2.4

Handling

the

4CX1000A

5

2.5

Power

Connection

5

2.6

Cooling

6

SECTION

3 -

OPERATION

3.1

Pre-Operation

7

3.2

Test

Data

7

3.3

Adjustment

7

3.4

Maintenance

9

SECTION

4 -

CIRCUIT

DESCRIPTION

4.1

Power

Amplifier

10

4.2

Exciter

11

4.3

Power

Supply

11

4.4

Control

Circuits

11

4.5

Metering

12

SECTION

5 -

ADDITIONAL

INFORMATION

5.1

Remote

Control

12

5.2

Stereophonic

Operation

13

5.3

Spare

Oven

and

Crystal

13

5.4

Complete

Tune-Up

Procedure

14

5.5

FM-1H

Parts

List

1-4

SECTION

6 -

M-6425

FM

EXCITER

FM-1H

TABLE

OF

CONTENTS

DRAWINGS

-

FM-1H

Transmitter

•

e

Installation

Outline

Low

Pass

Filter

2nd

Harmonic

Filter

Block

Diagram

Simplified

Schematic

Efficiency

Curve

Curve

-

Coarse

Tuning

Overall

Schematic

PHOTOGRAPHS

-

Transmitter

Front

View

(Open)

Back View

(Open)

Control Panel

(Front)

Control

Panel

(Rear)

PA

Chamber

Base

Figure

7.10

Figure

7.11

Figure

7.12

Figure

7.13

Figure

7.14

Figure

7.15

Figure

7.16

Figure

7.17

Helpful

General

Information--A

thru

E

FM-1H

e

e

SECTION

1

GENER&L

DESCRIPTION

1.1

Warranty

and

Safety

Notice.

This

equipment

is

guaranteed

under

the

liberal

Gates

warranty,

terms

and

conditions

of

which

are

fully

set

forth

in

the

standard

Gates

warranty,

available

upon

request.

Most Gates

manufactured

items

are

guaranteed

for

one

year,

with

the

exception

of

tubes

and

moving

parts,

which

are

subject

to

specific

warranties

based

upon

hours

of

usage.

The

warranty

does

not

extend

to

"no

charge"

service

in

the

field.

Switch

to

Safety

-

This

equipment

employs

voltages

which

are

dangerous

and

may

prove

fatal

if

contacted

by

operating

personnel.

Extreme

caution

should

be

exercised

when

working

with

the

equipment.

Observe

safety

regulations.

Do

not

change

tubes

or

make

adjustments

inside

equipment

with

any

voltages

ON.

While

your

Gates

transmitter

is

fully

interlocked,

you

should

not

rely

on

the

interlock

switch

for

removing high

operating

voltages.

It

is

always

best

to

disconnect

the

primary

power

at

the

building

wall

switch

and

discharge

all

capacitors

with

the

grounding

stick

provided.

1.2

Purpose

of

Book

-

This

instruction

book

has

been prepared

to

assist

in

the

installation,

operation

and

maintenance

of

the

Gates

FM-1H,

1

KW FM

transmitter.

1.3

Purpose

of

Equipment

-

The

Gates

FM-1H

is

an

FM

broadcast

transmitter

with

1,000

watts

output

delivered

to

the

transmission

line.

The

operating frequency

is

8S-108

mHz.

with

character-

istics

exceeding

those

required

by

the

FCC

for

standard

FM

broadcast

service.

The

transmitter

is

designed

for

continuous

broadcast

operation

and

consists

of

the

exciter

and

power

amplifier,

plus

associated

power

supplies.

-1-

FM-1H

1.4

Description

-

Only

one

cabinet

is

required

to

house

the

entire

transmitter.

This

cabinet

is

29"

wide

x

78"

high

x

33"

deep.

All

necessary

metering

is

provided

by

four

meters

located

on

a

meter

panel

at

the

top

of

the

cabinet.

Ready

access

to

the

complete

trans-

mitter

is

accomplished

by

the

removable

rear

door.

The

front

door

is

provided

to

offer

a

pleasing

and

symmetrical

front

view

appearance.

The

following

controls

are

located

on

the

front

panel.

a)

Filament

ON

h)

Filament

OFF

c)

Plate

ON

d)

Plate

OFF

e)

Filament

Voltage

Adjust

f)

Screen

Raise/Lower

Voltage

Adjust

g)

Bias

Voltage Adjust

h)

VSWR

Calibrate

i)

Power

Calibrate

j)

Power/VSWR

Selector

1)

Remote/Local

Switch

)

Grid

Tuning

Control

m)

Plate

Tuning

Control

n)

Output

Loading

Control

o)

(4)

Potentiometers

for

adjustment

of

PA

Plate

Current

Remote

Reading,

Recycle

Adjustment,

PA

Overload,

PA

Plate

Voltage

Remote

Reading

p)

Neutralizing

Adjust

1.5

FM-1H

Technical

Data

-

e

Power

Output:

Frequency

Range:

RF

Output

Impedance:

Output

Termination:

Frequency

Stability:

Harmonic

Attenuation:

Modulation

Capability:

Audio

Input

Impedance:

Audio

Input

Level:

Audio

Freq.

Response:

Audio

Distortion:

FM

Noise

Level:

AM

Noise

Level:

Power

Source:

.5

to

1

kW.

88

to

108 mHz

50

ohms.

Standard

EIA

1-5/8"

Flange.

+

.001%

-

80

dB.

+

100

kHz.

600

ohms.

+

10

dBm,

+ 2

dB

+ 1

dB,

30-15,000

Hz.

or

less,

30-15,000

Hz.

65 dB

below

100%

FM modulation.

50

dB

below

equiv.

100%

AM

modulation

208/240

V.

1

phase,

50/60

Hz,

3-wire

service.

115

V,

1

phase

50/60

Hz.

-2-

FM-1H

e

e

e

Input

AC

Power

Requirement

Power

Line

Variation

Power

Factor

Altitude

Ambient

Temp.

Range

Maximum

VSWR

Overall

Cabinet

Size

Weight

Front

Door

Swing

2.6

KW,

208/240

V,

6 WI

115

V.

(slow)

+5%.

71

500

ft.

-20°

C

to

45°

C.

1.7

to

1.

29"

W.

x

78"

H.

x

33"

D.*

600

lbs.

29".

*33"

is

overall

depth

dimension.

With

rear

door,

front

door

handle,

and

meter

trim

strip

removed

minimum

depth

is

30".

Filter

and

RF

plumbing

extends

5"

above

cabinet

top.

1.6

Vacuum

Tube

The

following

tube

is

employed

in

the

transmitter.

V-1

4CX1000A

Power

Amplifier

SECTION

2

INSTALLATION

2.1

Inspection

-

The

FM-1H

is

carefully

packed

at

the

Gates

plant

to

ensure

safe

arrival

at

its

destination.

The

equipment

is

packed

in

a

heavy

carton

and

a

wooden

crate.

Open

the

crate

and

carton

carefully

to

avoid

damaging

any

of

the

contents.

Remove

the

packing

material

and

search

for

possible

loose

items such

as

pilot

lights,

fuses,

loose

screws and

bolts.

If

damage should

occur

during

shipment

all

claims

should

be

filed

promptly

with

the

transportation

company.

If

a

claim

is

to

be

filed,

the

original

packing

case

and

ma-

terial

must

be

preserved.

A

damage

report

must

be

filed

to

collect

for

shipping

damages.

Gates Radio

Company

is

not

responsible

for

damage

occurring

during

shipment.

Parts

or

components

shipped

to

replace

those

damaged

in

transportation

will

be

billed

to

the

customer

plus

trans-

portation

expenses,

the

cost

of

which

should

form

a

por-

tion

of

your

claim

to

the

transportation

company.

A

complete

visual

inspection

should

be

made

of

the

equipment.

Determine

that

there

are

no

loose

connections,

loose

com-

ponents,

broken

insulators,

etc.,

that

may

have

been

dam-

aged

in

shipment.

Make

sure

all

relay

contacts

are

free

and

in

good

mechanical

condition.

Make

sure

all

mechanical

connections

are

tight.

Check

with

a

screw

driver

or

a

wrench

all

mechanical

and

electrical

connections

that

are

-3-

FM-1H