Harris GATES M-6573 Manual de usuario

mImanatmI

N-6573

FM-1H

1KW

TRANSMITTER

HARRIS

INTERTYPE

CORPORATION

a A

TES!

WARRANTY

Seller

warrants

new

equipment

manufactured by

Gates

Radio

Company

against

defects

material

work-

manship

the

time

for

delivery

thereof,

that

develop

under

normal

use

within

period

one

year

months

moving

parts)

from

the

date

shipment,

which

Purchaser

gives

Seller

prompt

written

notice.

Other

manufacturers'

equipment,

any,

including

electron

tubes,

and

towers

shall

carry

only

such

manufacturers'

standard

warranty.

Seller's

sole

responsbility

for

any

breach

the

foregoing

provision

this

contract,

with

respect

any

equipment

parts

not

conforming

the

warranty

the

description

herein

contained,

its

option,

(a)

repair

or replace

such

equipment

parts

upon

the

return

thereof

f.o.b.

Seller's

factory

within

the

period

aforesaid,

(b)

the

return

thereof

f.o.b.

Purchaser's

point

installation,

whereupon

Seller

shall

either

(1)

issue

credit

Purchaser's

account

hereunder

amount

equal

equitable

portion

the

total

contract

price,

without

interest,

(2)

the

total

contract

price

has

been

paid,

refund

Purchaser

equitable

portion

thereof,

without

interest.

the

Equipment

described

used,

sold

and

where

is.

the

contract

covers

equipment

not

owned

Seller

at this

date

sold

subject

Seller's

acquisition

possession

and

title.

Seller

assumes

responsibility

for

design

characteristics

special

equipment

manufactured

specifications

supplied

behalf

Purchaser.

Seller

shall

not

liable

for

any

expense

whether

for

repairs,

replacements,

material,

service

otherwise,

incurred

Purchaser

modifications

made

Purchaser

the

Equipment

without

prior

written

consent

Seller.

EXCEPT

SET

FORTH

HEREIN,

AND

EXCEPT

TITLE,

THERE

ARE

WARRANTIES,

ANY

AFFIRMATIONS

FACT

PROMISES

SELLER,

WITH

REFERENCE

THE

EQUIPMENT,

MERCHANTABILITY,

INFRINGEMENT,

OTHERWISE,

WHICH

EXTEND

BEYOND

THE

DE-

SCRIPTION

THE

EQUIPMENT

THE

FACE

HEREOF.

RETURNS

AND

EXCHANGES

not

return

any

merchandise

without

our

written

approval

and

Return

Authorization.

will

provide

special

shipping

instructions

and

code

number

that

will

assure

proper

handling

and

prompt

issuance

credit.

Please

furnish

complete

details

circumstances

and

reasons

when

requesting

return

mer-

chandise.

Custom

built

equipment

merchandise

specially

ordered

for

you

not

returnable.

Where

return

the

request

of,

for

the

convenience

the

customer,

restocking

fee

15%

will

charged.

All

returned

merchandise

must

sent

freight

prepaid

and

properly

insured

the

customer.

When

writing to

Gates

Radio

Company

about

your

order,

will

helpful

you

specify the

Gates

Factory

Order

Number

Invoice

Number.

WARRANTY

ADJUSTMENTS

the

event

equipment

failure

during

the

warranty

period,

replacement

repair

parts

may

provided

accordance

with

the

provisions

the

Gates

Warranty.

most

cases

you

will

required

return

the

defective

merchandise

part

Gates

f.o.b.

Quincy,

Illinois

for

replacement

repair.

Cost

repair

parts

replacement

merchandise

will

billed

your

account

the

time

shipment

and

compensating

credit

will

issued

offset

the

charge

when

the

defective

items

are

returned.

MODIFICATIONS

Gates

reserves

the

right

modiry

the design

and

specifications

the

equipment

shown

this

catalog

without

notice

withdraw

any

item

from

sale

provided,

however,

that

any

modifications

shall

not

ad-

versely

affect

the

performance

the

equipment

modified.

INSTRUCTIONS

FOR

INSTALLING

AND

OPERATION

GATES

FM-1H,

TRANSMITTER

•

I B -

888

0960

001

GATES

RADIO

COMPANY

QUINCY,

ILLINOIS

•

HARMONICS

THE

BAND

The

sharp

upsurge

broadcasting

has

some

instances

developed

unlooked

for

interference

with

local

reception.

every

instance

this

interference

so-called

fringe

areas

for

reception

and

where

the

strength

the

signal

weak

enough

that

outside

highly

directional

home

antennas

are

necessary.

When

this

condition

develops,

the

viewer

quickly

learns

from

his

service

man

that

the

local

station

the

offender.

----

The

broadcaster

immediately

deluged

with

requests

eliminate

the

interference.

some

instances

CATV

(Community

Antenna

Television)

systems

are

also

offended

they

pick

weak

distant

stations.

-----

What

the

broadcaster's

responsibility?

Answer:

meet

FCC

rules

and

regulations

harmonic

radiation

his

equipment

but not

guarantee

perfect

reception.

Below

chart

showing

the

picture

and

sound

frequencies

stations

between

Channels

7-13

inclusive.

Channels

2-6 are

not

shown.

harmonics

not

fall

these

Channels.

fact,

commercial

station

harmonics

will

affect

only

Channels

and above

----

look

the

chart.

Channel

Picture

Frequency

Band

---Mc---

Sound

Frequency

175.25

179.50

181.25

185.50

187.25

191.50

193.25

197.50

199.25

203.50

205.25

209.50

211.25

215.50

197.75

185.75

191.75

197.75

203.75

209.75

215.75

The

frequency

range

for

commercial

broadcasting

92.1

107.9

Mc:

---

determine

the

second

harmonic

your

frequency,

just

multiply

your

frequency

Example:

your

frequency

99.9

Mc,

multiplied

would

make

second

harmonic

199.8

Mc.

consulting

the

above

chart,

you

will

note

the

second

harmonic

falls

the

picture

portion

the

Channel

11.

Correct

Harmonic

Radiation

The

FCC

stipulates

that

transmitters

3000

watts

power

and

over

must

have

harmonic

attenuation

db.

For

1000

watts,

db.,

and

for

250

watts,

66.9

db.

All

reputable

manufacturers

design

their

transmitters

meet

exceed

these

specifications.

Fringe

Area

Strength

Versus

Harmonics

Let's

take

typical

station

that

radiates

70,000

microvolts

per

meter

mile.

db.

harmonic

attenuation

(as

called

for

FCC),

this

station

will

radiate

approximately

microvolts

per

meter

mile on

the

second

harmonic.

the

case

our

Channel

example,

estimated

that

fringe

area

station

from

miles

distance

would

have

signal

strength

from

microvolts

per

meter.

can

then be

easily

understood

that

a 7

microvolt

signal,

well

within

FCC

specifications,

would

definitely

interfere

with

the

signal,

yet

with

the

broadcaster's

equipment

performing

normally.

This

sometimes

further

aggravated by

the

station

being

located

between

the

station

and

the

receivers.

this

instance

the

antennas

are

focussed

not

only

the

station

but

yoür

station

well.

The

home

antennas

are

beamed

your

legal

second

harmonic

well

the

fringe

station.

What To

When

interference

occurs,

will

develop

ragged

horizontal

lines

the

picture

varying

with

the

program

content.

the

sound

portion

interfered

with

(usually

not

the

case),

then

the

signal

will

heard

addition

the

sound.

not

the

broadcaster

the

defensive.

did

not put

the

station

miles

away

nor

did

select

the

Channel.

----

most

instances

the

condition

natural

phenomena

that

neither

you,

the

station,

nor

the

FCC

can

correct.

not

adjust

the

harmonic

"T"

notch

filters

supplied

with

the

transmitter.

These

are

factory

adjusted

and

most

stations

not

have

the

expensive

equipment

necessary

for

correct

adjustment.

Tampering

with

this

calibrated

adjustment

will

probably

make

the

condition

worse.

not

rely

service

men's

types

measuring

equipment.

They

are

not

built

accurately

measure

harmonics

and

invariably

give

erroneous

readings

that

invite

the

CATV

local

service

men's

association

say

told

you

so."

Remember

difficult

radiate

harmonics

the

equipment

built

suppress

the

harmonics

and

is.

many

instances

interference

may

caused

overloading

the

front

the

receiver.

This

problem

usually

occurs

when

the

receiver

located

the

transmitter.

This

problem

can

overcome

installing

trap

tuned

the

frequency

the

carrier.

The

service

can and

must

learn

how

this.

most

cases

works,

while

,me

instances,

not

properly

installed

tuned,

will

not

completely

eliminate

the

interference.

one

case

where

interference

of this

type

existed,

station

put

traps

for

the

fundamental

frequency

nearly

every

set

town.

Not

the

transmitter.

Summary

The

FCC

well

acquainted

with

this

nation-wide

problem.

viewers

write

FCC,

complaining

about

your

station,

remember

the

FCC

has

received

few

thousand

similar

letters.

not the

obligation

the

broadcaster

assure

fringe

area

reception

station

any

than

the

obligation

the

statirsn

assure

the

broadcaster

perfect

reception

his

city.

Probably

your

installation

will

not

have

problems

outlined

above.

they

exist,

don't

blame

the

equipment.

Every

transmitting

device

puts

out

second

harmonic,

even

the

stations.

The

fact

that

these

harmonics

legally

fall

into

the

spectrum

station

many

miles

distant

coincidental,

but not

your

fault.

•

Gates

Radio

Company

•

FM-1

.H 1

TRANSMITTER

TABLE

CONTENTS

SECTION

1 -

GENERAL

DESCRIPTION

PAGE

1.1

Warranty

and Safety

Notice

1.2

Purpose

Book

1.3

Purpose

Equipment

1.4

Description

1.5

Technical

Data

1.6

Vacuum

Tube

Table

SECTION

2 -

INSTALLATION

2.1

Inspection

2.2

Packing

Check

List

2.3

Installation

2.4

Handling

the

4CX1000A

2.5

Power

Connection

2.6

Cooling

SECTION

3 -

OPERATION

3.1

Pre-Operation

3.2

Test

Data

3.3

Adjustment

3.4

Maintenance

SECTION

4 -

CIRCUIT

DESCRIPTION

4.1

Power

Amplifier

4.2

Exciter

4.3

Power

Supply

4.4

Control

Circuits

4.5

Metering

SECTION

5 -

ADDITIONAL

INFORMATION

5.1

Remote

Control

5.2

Stereophonic

Operation

5.3

Spare

Oven

and

Crystal

5.4

Complete

Tune-Up

Procedure

5.5

FM-1H

Parts

List

1-4

SECTION

6 -

M-6425

EXCITER

FM-1H

TABLE

CONTENTS

DRAWINGS

FM-1H

Transmitter

•

Installation

Outline

Low

Pass

Filter

2nd

Harmonic

Filter

Block

Diagram

Simplified

Schematic

Efficiency

Curve

Coarse

Tuning

Overall

Schematic

PHOTOGRAPHS

Transmitter

Front

View

(Open)

Back View

(Open)

Control Panel

(Front)

Control

Panel

(Rear)

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

FM-1H

SECTION

GENER&L

DESCRIPTION

1.1

Warranty

and

Safety

Notice.

This

equipment

guaranteed

under

the

liberal

Gates

warranty,

terms

and

conditions

which

are

fully

set

forth

the

standard

Gates

warranty,

available

upon

request.

Most Gates

manufactured

items

are

guaranteed

for

one

year,

with

the

exception

tubes

and

moving

parts,

which

are

subject

specific

warranties

based

upon

hours

usage.

The

warranty

does

not

extend

"no

charge"

service

the

field.

Switch

Safety

This

equipment

employs

voltages

which

are

dangerous

and

may

prove

fatal

contacted

operating

personnel.

Extreme

caution

should

exercised

when

working

with

the

equipment.

Observe

safety

regulations.

not

change

tubes

make

adjustments

inside

equipment

with

any

voltages

ON.

While

your

Gates

transmitter

fully

interlocked,

you

should

not

rely

the

interlock

switch

for

removing high

operating

voltages.

always

best

disconnect

the

primary

power

the

building

wall

switch

and

discharge

all

capacitors

with

the

grounding

stick

provided.

1.2

Purpose

Book

This

instruction

book

has

been prepared

assist

the

installation,

operation

and

maintenance

the

Gates

FM-1H,

KW FM

transmitter.

1.3

Purpose

Equipment

The

Gates

FM-1H

broadcast

transmitter

with

1,000

watts

output

delivered

the

transmission

line.

The

operating frequency

8S-108

mHz.

with

character-

istics

exceeding

those

required

the

FCC

for

standard

broadcast

service.

The

transmitter

designed

for

continuous

broadcast

operation

and

consists

the

exciter

and

power

amplifier,

plus

associated

power

supplies.

-1-

FM-1H

1.4

Description

Only

one

cabinet

required

house

the

entire

transmitter.

This

cabinet

29"

wide

78"

high

33"

deep.

All

necessary

metering

provided

four

meters

located

meter

panel

the

top

the

cabinet.

Ready

access

the

complete

trans-

mitter

accomplished

the

removable

rear

door.

The

front

door

provided

offer

pleasing

and

symmetrical

front

view

appearance.

The

following

controls

are

located

the

front

panel.

Filament

OFF

Plate

OFF

Filament

Voltage

Adjust

Screen

Raise/Lower

Voltage

Adjust

Bias

Voltage Adjust

VSWR

Calibrate

Power

Calibrate

Power/VSWR

Selector

Remote/Local

Switch

)

Grid

Tuning

Control

Plate

Tuning

Control

Output

Control

(4)

Potentiometers

for

adjustment

Plate

Current

Remote

Reading,

Recycle

Adjustment,

Overload,

Plate

Voltage

Remote

Reading

Neutralizing

Adjust

1.5

FM-1H

Technical

Data

Power

Output:

Frequency

Range:

Output

Impedance:

Output

Termination:

Frequency

Stability:

Harmonic

Attenuation:

Modulation

Capability:

Audio

Input

Impedance:

Audio

Input

Level:

Audio

Freq.

Response:

Audio

Distortion:

Noise

Level:

Noise

Level:

Power

Source:

kW.

108 mHz

ohms.

Standard

EIA

1-5/8"

Flange.

.001%

dB.

100

kHz.

600

ohms.

dBm,

+ 2

+ 1

dB,

30-15,000

Hz.

less,

30-15,000

Hz.

65 dB

below

100%

FM modulation.

below

equiv.

100%

modulation

208/240

phase,

50/60

Hz,

3-wire

service.

115

phase

50/60

Hz.

-2-

FM-1H

Input

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

6 WI

115

(slow)

+5%.

500

ft.

-20°

45°

1.7

29"

78"

33"

D.*

600

lbs.

29".

*33"

overall

depth

dimension.

With

rear

door,

front

door

handle,

and

meter

trim

strip

removed

minimum

depth

30".

Filter

and

plumbing

extends

above

cabinet

top.

1.6

Vacuum

Tube

The

following

tube

employed

the

transmitter.

V-1

4CX1000A

Power

Amplifier

SECTION

INSTALLATION

2.1

Inspection

The

FM-1H

carefully

packed

the

Gates

plant

ensure

safe

arrival

its

destination.

The

equipment

packed

heavy

carton

and

wooden

crate.

Open

the

crate

and

carton

carefully

avoid

damaging

any

the

contents.

Remove

the

packing

material

and

for

possible

loose

items such

pilot

lights,

fuses,

loose

screws and

bolts.

damage should

occur

during

shipment

all

claims

should

filed

promptly

with

the

transportation

company.

claim

filed,

the

original

packing

case

and

ma-

terial

must

preserved.

damage

report

must

filed

collect

for

shipping

damages.

Gates Radio

Company

not

responsible

for

damage

occurring

during

shipment.

Parts

components

shipped

replace

those

damaged

transportation

will

billed

the

customer

plus

trans-

portation

expenses,

the

cost

which

should

form

por-

tion

your

claim

the

transportation

company.

complete

visual

inspection

should

made

the

equipment.

Determine

that

there

are

loose

connections,

loose

com-

ponents,

broken

insulators,

etc.,

that

may

have

been

dam-

aged

shipment.

Make

sure

all

relay

contacts

are

free

and

good

mechanical

condition.

Make

sure

all

mechanical

connections

are

tight.

Check

with

screw

driver

wrench

all

mechanical

and

electrical

connections

that

are

-3-

FM-1H

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