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m2ke/13m

HARRIS

INTERTYPE

CORPORATION

M-6576

FM-

7.5H FM

TRANSMITTER

GATES

A

DIVISION

OF

HARRIS-INTERTYPE

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

manutactured

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

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

modify

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.

INSTRUCTIONS

FOR

INSTALLING

OPERATION

OF

FM-

7.5H,

7.5U

FM

TRANSMITTER

IB-888

0963

031

Gates

Radio

Company

Quincy,

Illinois

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

179.50 197.75

8

181.25

to

185.50 185.75

9

187.25

to

191.50

191.75

C10

193.25

to

197.50

197.75

11

199.25

to

203.50

203.75

12

205.25

to

209.50

209.75

13

211.25

to

215.50

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

4

%e

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

your

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

end

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

man

can

and

must

learn

how

to

do

this.

In

most

cases

it

works,

while

in

some

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

station

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.

o

Gates

Radio

Company

TABLE

OF

CONTENTS

SECTION

1 -

GENERAL

DESCRIPTION

1.1

Warranty

and

Safety

Notice

1

1.2

Purpose

of

Book

1

1.3

Purpose

of

Equipment

1

1.4

Description

1

1.5

Technical

Data

2

1.6

Vacuum

Tube

Table

3

SECTION

2 -

INSTALLATION

2.1

Inspection

3

2.2

Packing

Check

List

3

2.3

Installation

4

2.4

Handling

the

4CX5000A

5

2.5

Power

Connection

6

2.6

Cooling

6

SECTION

3 -

OPERATION

3.1

Pre-

operation - (

Also

see

Section

6)

3.2

Test

Data

3.3

Adjustment

3.4

Maintenance

SECTION

4 -

CIRCUIT

DESCRIPTION

4.1

Power

Amplifier

4.2

Intermediate

Power

Amplifier (

IPA)

4.3

Exciter

4.4

Power

Supply

4.5

Control

Circuits

4.6

Metering

7

7

8

10

11

12

12

12

13

14

SECTION

5 -

ADDITIONAL

INFORMATION

5.1

Remote

Control

14

5.2

Stereophonic

Operation

14

5.3 FM-

7.5H

Parts

List

15

SECTION

6 -

M-6425

EXCITER -

SECTION

7 -

ILLUSTRATIONS

7.1

FM-

7.511

Front

View,

Showing

Operating

Controls

7.2

Floor

of

Transmitter (

Rear

View).

7.3

RF

Output

Balun

7.4

RF

Cubicle

7.5

Installation

Drawing

7.6

Graph -

PA

Tuning

7.7

Block

Diagram,

FM-

7.5H

7.8

IPA

PA

Simplified

Block

Diagram

7.9

Graph -

PA

Efficiency

7.10

Overall

Schematic -

Transmitter

7.11

Low

Pass

Filter

7.12

2nd

Harmonic

Filter

FM-

7.5H

SECTION

1 -

GENERAL

DESCRIPTION

1.1

Warranty

and

Safety

Notice

This

equipment

is

guaranteed

under

the

liberal

Gates

Warranty,

terms

and

conditions

of

which

are

full

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

on

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

inter-

locked

you

should

not

rely

on

the

interlock switches

for

re-

moving

high

operating

voltages.

It

is

always

best

to

discon-

nect

the

primary

power

at

the

building

wall

switch

and

dis-

charge

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-

7.5H,

7.5KW

FM

transmitter.

1.3

Purpose

of

Equipment

The

Gates

FM-

7.5H

is

an

FM

broadcast

transmitter

with

7,500

watts

output

delivered

to

the

transmission

line.

The

operat-

ing

frequency

is

88-108

MHz

with

characteristics

exceeding

those

required

by

the

Federal

Communications

Commission

for

standard

FM

broadcast

service.

The

transmitter

is

designed

for

continuous

broadcast

operation

and

consists

of

the

exciter,

intermediate

power

amplifier,

and

the

power

amplifier,

plus

their

associated

power

supplies.

1.4

Description

Only

one

cabinet

is

required

to

house

the

entire

transmitter.

This

cabinet

is

42"

wide

x

78"

high

x

32-3/4"

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

transmitter

is

accomplished

by

removable

rear

door,

hinged

access panel,

and

cover

of

the

exciter

unit. Front

doors

-1-

FM-

7.5H

arc

provided

to

offer

a

pleasing

and

symmetrical

front

view

appearance.

The

following

controls

vre

located

on

the

front

panel (

see

Illustration

7.1):

a)

b)

c)

d)

e)

f)

g)

h)

i)

j)

k)

Filament

ON

Filament

OFF

High

Voltage

ON

High

Voltage

OFF

Power

Amplifier

Fila-

ment

Voltage

Control

PA

Screen

Voltage

Control

Multimeter

Selector

VSWR

Calibrate

Power

Calibrate

Power/VSWR

Selector

IPA

Screen

Voltage

Control

1.5 FM-

7.5H

Technical

Data

Power

Output

Frequency

Range

RF

Output

Impedance

Output

Termination

Frequency

Stability

Harmonic

Attenuation

Modulation

Capability

Audio

Input

Impedance

Audio

Input

Level

Audio

Frequency

Response

Audio

Distortion

FM

Noise

Level

AM

Noise

Level

Power

Source

Input

AC

Pwr

Require

Pwr

Line

Variation

(Slow)

Power Factor

Altitude

Ambient

Temperature

Range

Maximum

VSWR

Overall

Cabinet

Size

Weight

Front

Door

Swing

1)

m)

n)

p)

r)

s)

Remote/Local

Switch

Plate

Tuning

Control

Output

Loading

Control

IPA

Plate

Tuning

Control

IPA

Grid

Tuning

Control

Plus

Five (

5)

Potentio-

meters

for

Adjustment

of

PA

Plate,

Current

Remote

Reading,

Recycle

Adjustment,

IPA

Overload

PA

Plate Volt-

age

Remote

Reading

Adjustment

PA

Overload.

4.5

to

7.5

KW

88

to

108

MHz

50

ohms

Standard

EIA

3-1/8"

Flange

±.001%

-80

dB

±100

kHz

600

ohms

+10

dBm, ±

2

dB

±1

dB -

30-15,000

Hz

1/2%

or

less -

30-15,000

Hz

65

dB

below

100%

FM

modulation

50

dB

below

equivalent

100%

AM

modulation

08/24V,

3

pi),

60

Hz,

115V,

1

ph,

60

Hz.

15

KW -

240

V.,

500

Watts -

115

V.

±5%

90%

7500 Feet

20

oC

to 45

o

C.

1.7

to

1

42"

x

78"

H x

32-3/4"

D*

1100

Lbs.

21"

*32-3/4"

is

overall

depth

dimension.

With

rear

door,

front

door

handles,

and

meter

trim

strip

removed

minimum

depth

is

29-3/4".

Filter

and

RF

plumbing

extends

9-1/2"

above

cabinet

top.

-2-

FM-

7.5H

1.6

Vacuum

Tube

Table

The

following

tubes

are

employed

in

the

transmitter.

Symbol

Designation

Tube

Type

Function

V1

4CX5000A

Power

Amplifier

V2

4CX250B Intermediate Power

Amplifier

SECTION

2 -

INSTALLATION

2.1

Inspection

The

FM-

7.5H

is

carefully

packed

at

the

Gates

plant

to

ensure

safe

arrival

at

its

destination.

The

equipment

is

packed

in

a

number

of

heavy

cartons

and

wooden

crates.

Open

the

crates

and

cartons

carefully

to

avoid

damaging

any of

the

contents.

Remove

the

packing

material

and

search

for

possible

small

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

material

must

be

preserved.

A

damage report

must

be

filed

to

collect

for

shipping

damages.

Gates Radio

Company

is

not

responsible

for

damage

occuring during

shipment.

Parts

or

components

shipped

to

replace

those

damaged

in

transportation

will

be

billed

to

the

customer

plus

transportation

expenses,

the

cost

of

which

should

form

a

portion

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

components,

broken

insulators,

etc.,

that

may

have been

damaged

in

shipment.

Make

sure

all

relay

contacts

are

free

and

in

good

mechanical

condition.

Make

sure

all

mechanical

connections

arc

tight.

Check

with

a

screw

driver

or

a

wrench,

all

mechanical

and

electrical

connections

that

are

mechanically

bolted

together.

All

tie

downs

or

blocking

used

for

shipping

purposes

should

be

removed.

A

good

overall visual

inspection

may

save

time

and

trouble

in

placing

the

transmitter

into

operating

condition.

2.2

Packing

Check

List

Certain

components

of

the

transmitter

have

been

removed

for

shipment

and

are

packed

separately

to

ensure

safe

handling.

These

parts

on

the

FM-

7.5H

have been

kept

to

a

bare

minimum

are

are

plug-in

units

and

heavy

components.

Tubes

that

are

not

clamped

down

for

normal

operation

are

also

removed.

The

following

components

have

been removed

from

the

transmitter

for

shipping

purposes:

-3-

FM-

7.5H

Quantity

Part

Number

Description

1

404

0073

000

Chimney

SK606 (

4CX250B)

1

813

9383

001

Exhaust

Tubing

and

0

Rings (

4CX250B)

1

472

0397

000

Power

Transformer,

T4

1

374

0081

000

Tube,

4CX250B

1

Assy.

942

3928

001

Notch

Filter &

RF

Output

Balun

1

Assy.

992

1600

001

Low

Pass

Filter

As

various

components

are

removed,

the

wires

connecting

each

component

are

numbered

or

tagged

for

placement

of

these

parts.

After

determining

that

all

these

components

are on

hand, you

are

ready

to

proceed

with

the

installation

in

an

orderly

manner.

2.3

Installation

In

advance

of

actual

placement

of

the

equipment,

certain

plan-

ning

should

be

accomplished.

The

use

of

illustrations

7.2

and

7.5

will

assist

in

locating

the

power

and

audio

input

terminals

of

the

transmitter.

Either

side of

the

transmitter

may

be

placed

against

a

wall

or

other

equipment.

Complete

accessibility

for

maintenance

and

installation

is

provided

in

the

FM-

7.5H

by

access from

the

front

or

the

rear

of

the

transmitter

cabinet.

Mount

the

power

transformer (

T4)

through

the

back

door

of

the

transmitter.

It

would

be

wise

to

remove

the

ceramic

fuse

block

temporarily

when

doing

this

to

prevent

accidental

damage

to

this

part.

Orient

the

transformer

so

that

the

secondary

taps on

the

coils

face

inward.

Connect

the

primary

power

leads

from

contactor

K2

to

the

marked

terminals

at

the

top

of

T4.

Secondary

leads

are

tagged

for

connection

to

their

proper

taps

on the

coils.

Install

the

plug-in

capacitor

in

the

transmitter

bias supply.

Refer

to the

TE

-1

Exciter

Installation

Instructions

for

proper

module

placement

-

in

the

exciter

cabinet.

Unblock

the

blower

assembly.

The

RF

output

balun

assembly

installs

from inside

the

transmitter

enclosure.

Before

mounting,

temporarily

remove

both

monitor

coupling

loops

from

the top

portion

of

the

balun.

With

the

innerconductor

removed

and

the

balun

sleeve

up,

bolt

the

unit

beneath

the top

of

the

enclosure (

as

shown

in

Figure

7.3).

Insert

the :

innerconductor

from

the

top.

-4-

FM-

7.5H