Collins 900C-1 Instruction Book

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Cedar Rapids Division I Collins Radio Company, Cedar Rapids, Iowa

j

•

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7

Rev.

8-62

The

equipment

Collins
defective
portation prepaid,

Collins
µc,wer output

as

a g

uar

The

authorized

No

foregoing

In

no

event shall

or

indirectly

tion

w1

How

0

1·

otherwise,

applicable.

and

identification
suggest
Up

on

advice

in

the

agrees

as

to

(a)

Notice
ar e

(b)

Equipment,
are

(c)

No equipm
m
proper

further guarant

at

antee

guarantee

service cein

other

warranties,

shall

arising

th

other equipment

to Return

If

the

that your

receipt

prior

handling

of

to the

of your

described herein

to

repair

design,

provided

of

the

returned

accessories,

subject

ois

the

of

any

constitute

Collins

to only

ent

ture in the

manner.

antenna lead

definite

of these

er.

have

from

Mate

you

sho

uld

item

1s thought to

(including part

adjustmen

such notice, Collins

forwarding

returned

or

workmanship

claimed

in

accordance

or

atmosphere

ees

coverage

paragraphs

expressed

the

Buyer's

any

the use

ot

materials,

rial

notify

ts

can

of

111

is

sold under

replace,

or

defect

tub

such

adjustments

accessory

that

any

when

connected
or r

is

or

sole

liability

of the

products,

or

or

Equipment

us,

be

defective,
number
be

speeded

will

the

goods

erchandise

Guarante

the

following

wiU1out

material,

1s

given

with

Collins

es,

and

shall

or oth

radio

ange

void

if

implied,

right

for

consequential damages,

from

giving

if

possible)

up

promptly

or

failure

.

charge, any

and

Collins

instructions.

batteries

as

Collins

be

deemed

erwise aft

transmitter

to a suitable

of

said

apparatus.

equipment

shall

be

and

remedy

or

any

inability

any

othe

1·

full

particulars including

such notice

of

part

if

you give notice

advise you r
to

provide

e

guarantee

equipment, parts,

which

are

within

one

not

manufactur

may

obtain from

to

be

er

delivery,

described

load, but

is

altered

applicable

under

the

to

cause.

If

,

for

mat

erial or equipm

must
considered

of
espec

full

:

returned

(1)

year

ed

defective

it shall

herein

such

or

repaired

to

any

agreements

or

for

use

them eith

any

reason, you

give

full

defective.

defect

ting

particulars

to

Collins

from

by

Collins
the

supplier thereof.

ii,

due

fail

will

deliver

guarantee

by

equipment

in

loss,

damage

er

ent, whether

the

details

information

directly

the

return.

may

or

accessories

at

date

of

delivery

or

from

to

exposure

to

operate

full

shall

others

sold

hereuncter,

this

paragraph

or

separately

should

und

listed

as

to

(With

respect

to

the

tube

Failur

cause

unnecessary

which

its

factory,

and

Collins

or

excessive

in a

normal

radio

frequency

not

be

con

than

Collins

contained

expense

or

in

combina-

wish

to

er

the

guarantee

below,

insofar

nature

of

to

tubes

manufacturer.)

e to

secure our

are

trans-

goods

designs

or

strued

or

its

and

the

directly

return

as

defect

we

delay

.

ADDRESS:

How

ti

on

insofar

complete

ADDRESS:

Collins
Service
Cedar

Rapids,

to

Order

as

information.

Co

llins
Service
C

edar

Rapids, Iowa

Radio

Company

Division

Iowa

Replacement

applicable.

Radio

Company

Division

To

enable

INFORMATION

(A)

Type number,

(B)

Date

of

(C)

Date pla

(D)

Number

(E)

Nature

(F)

Cause

(G) Part

thought

(H) Item

list

or

(I)

Collins
volved

(J)

Remarks

Wh

en

Parts

us

to

give

INFORMATION NEEDED:

ordering

order

as

you

better

(A)

Quantity

(B)

Collins
descriplion

(C) Item

schematic

(D)

Collins type
pal

(E)

Unit

indi

equipment

subasse

NEEDED:

name

delivery

ced

in servi

of

hours

of

trouble

of tro

uble 1f

number

or

schematic

in

or symb

(9

to

be

causing

symbol

number

trouble

replacement

catl'd

below

replacement ser

required

part

ol

number,

mbly number

of

equipment

ce

of

service

known

or

10

troubl

number

(and

nam

and

number

number

name

and

serial

digit

number)

e

of

same

e)

of

parts,
furnish the

vice, please

(9

or 10

obtained from

and

(where

number

and

obtained

unit

subass..:mblies

you

should
following

be sure to

digit

serial

number

applicable)

of equipm

name

of

from

direct your

informa

give

number)

parts

list

of

princi-

ent

part

parts

in-

-

us

and

or

www.SteamPoweredRadio.Com

523-0756372-0

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Radio

book

Company

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Cedar Rapids Division

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Rad

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Iowa

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www.SteamPoweredRadio.Com

~.

www.SteamPoweredRadio.Com

table

of

contents

Section

1

2

3

GENERAL

1.1

1.2

1.3

1.3.1

1.3.2

1.4

1.5

1.6

1.6.1

1.6.2

1.7

INSTALLATION

2.1

2.2

DESCRIPTION.

Purpose
Purpose
Des

Equipment
Equipment
Equipm

Se

mi

Unp

a

In

sta

2.2.1

2.2.2

2.2.2.1

2.2.2

.2

2.2.3

OPERATION.

of

Instru

of

Equipment.

c

ripti

on

of

Physi

ca

l D

Ele

ctrica

Supplied

Requir

e

nt

Specifi

Mechanical

Electri

co

ckin

llati
Mountin
Ext

In

c

nductor

. .

g
on

Procedures

g

e

rnal
Po

wer

In

pu

stallation

. . . . .

c

tion

Book

Equipment

escription

l D

esc

ription

. . . .

ed

but

ca

tions

. . . . . . . . .

al

and

Fus

e

.....

Connections

Connecti

t-Output

Connections

Adjustm

.

.
.

not

Supplied

Co

mplement

o

ns

and

e

nt

Pr

Change

oced

.

. . .

ur

es

Pa

ge

1-1

1-1
1-1
1-1
1-1
1-2
1

-2
1- 2
1-3
1-3

1-3
1-

5

2-1

2-1
2-1
2-1

.

2-1
2-1

2-1

.

2-1

3-1

3.1

3.1.1

3.1.2

3.

1.3

3.1.4
3

.1.5

3.1.6

3.1.

7

3.1.8

3.1.8.1

3.1.8.2

3.1.9

3.1.10

3.1.10.1

3.1.10.2

3.1.11

3.

1.12

3.1.13

3.1.14

3,2

4

PRINCIPLES

4- 1

Ge

neral

Sub

SCA

Norma

OF

Gene

R-F

Level

Modulation

Monaur

AM No
Fr

Distortion
Phas

Stereo

Chann
Cr

Excit
Pilot

ral . .

al

900

C-

1B

ise

e

qu

e

ncy

900C-1C).

e C

alibrat

No

Left

Ri

g

ht

el Separ a

oss

talk
Transmit
Tr

ansmit

ca

rrier

er

Pi

Car

Inj

ect

l

Op

e

rati

OPERATION.

..

Adjustm

Met er

Si

g

,

900C

M

eas

R

espo

M

eas

ise

Chann

Ch

M

eas

Suppression

l

ot

ri

er Le

ion

on

e

nt

(900C

-l

,

900C-1A,

Calibrate

na

l/

Nois

e

- 1

C)

urem

e

ns

e Me

. . . . . . . . . . . . . . . . . . . . . . . .

ur

em e

e (9

00

Me

anne

Carrier

Lev

. .

C- 1,

as

ur

e

ment

el

Noise

l

Nois

tion

(900C - l ,

urements

Main

Ch

Subchanne

vel

M

el M

(900C- 1,

Rati

o

Measur

...

nts

nt

Phasing
eas
eas

.

(900C - 1,

asur

eme

s

(900

C-

900C

s (900C- l ,

Measurement

e M

eas

900C-1A)

(900C-

a

nn

el , Me

l, M

eas

(900C

-l

ur

em e

ur

em

..

900C-1A

nts

1,

- 1A) .

ur

eme

1,

900C

asur

ur

e Ma

,

900C-1A)

(9

00

C-l,

nt

(900C - 1,

ents

.

900C-1A,

(900C-

900

900C-1A,

e

ments

............

(900C- 1,

..

..

900C-1A)

.

nt

. . .
. . .

-1A).

e

Subchann

in

Channel

900C

l ,

C

-1B,
900C-1B

(900C- 1,

,

900C-1B,

900C-1A

900C

-

1B,

.

el

Cro

Crossta

.....

- 1A)

..

900C-1A).

900C-

1

B)

900C

900C-1A

900C-1C)

,

ss

- 1C) .

,

900C-1C)

900C

900C

talk.

l

k.

,

-

1B

- 1C).

3-1
3-1

.

.
.

,

3- 1

3-2
3-2

3-2

3-3
3-3
3-3

3-3

3-3
3- 3
3-3

3-3

3-4
3-4
3-4
3-4
3-4
3-4

4-1

4-1

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table

of

contents

(cont)

Section

5

4.2

Block

4.2.1

4.2.2

4.3

Detailed

4.3.1

4.3.1.1

4.3.1.2

4.

3.1.3

4.3.1.4

4.3.1.5

4.3.1.6

4.3.2

4.3.2.1

4.3.2.2

MAINTENANCE

5.1

5.2

General
Transistor

5.2.1

5.2.2

5.2.3

5.3

5.4

Trouble
Adjustment

5.4.1

5.4.2

5.4.3

5.4.4

5.4.5

5.4.6

5.4.7

5.4.8

5

.4.9

5.4.10

5.4.

11

5.4.12

Main

Subchannel
SCA
Peak
19-Kc
Pilot
38-Kc
Stereo

Diagram
Monaural
Stereo

Circuit

Monaural

Mixing
Pulse

Phase-Splitter
Peak
Peak

Average

Stereo

19-Kc

Stereo

Transistor
Testing
Testing

Shooting

Test
Oscillator-Tripler
Modulation

900C-1C)

Modulation

900C-1C).

900C-1C).

Modulation

Discussion.

Operation

Operation

Discussion

Circuits

and

Counting

Voltmeter
Light

Voltmeter

Circuits

Amplifier-Doubler

Demodulator

Testing

Testing

PNP

Transistors

NPN

Transistors

. . . . . .

Procedures

Equipment

Meter

.. ..

Polarity

. . . . . . . . . . . . . . . . . . . . . . . . .

Channel Modulation

. . . . . . . . . . . . . . . . . . . . .

Modulation

Light

Adjustment

Tuning

Modulation

Tank

Demodulator

Adjustmen

Circuit

. •

. . .

. .

AM

Detector
Demodulator

and

Filter

Circuit

Circuits.

. . . . . . . .

Techniques

. . .

. • .

Required

Tuning

Calibration

.

...

Equalizing

Adjustment

Adjustment

Tuning

Adjustments

. .

. . .

Circuit

and

Amplifier

.

(900C-l,

..

Adjustment

Adjustment

(900C-1,

(900C-l,

ts

{900C-l,

(900C-l,

(900C-l,

Circuits.

Circuits

Circuits

and

38-Kc

900C-1A,

Adjustment

...

Adjustment

(900C-1,

(900C-l,

900C-1B

900C-1A,

900C-1A

900C-1A

900C-1A

(900C-1,

.

Phasing

Circuits

(900C-l,

...

900C-1B, 900C-1C).

900C-1A

Circuits

900C-1B,

....

(900C-l,

900C-1A,

900C-1A

Only)

Onl

y) ...

Only)

Only)

900C-1A,

900C-1A, 900C-1B

Only)
..

..

Only)

900C-1C)

900C-l

.. ..

900C

-l

..

...

B,

. . . .

B,

Page

4-1

4-1

4

-2
4-2
4-2
4-2
4-5
4-5

4-6

4-6

4-6

4-7
4-7
4-7

5-1
5-1

5-1
5-1
5-1
5-2
5-2
5-2
5-2
5-2

5-2

,

5-5

5-6
5-6
5-6
5-7
5

-7
5-7
5-7

5

-8

6

7

ii

PARTS

ILLUSTRATIONS

LIST

6

-1

7-1

www.SteamPoweredRadio.Com

li~t

of

illustrations

Figure

1-1
2-1
2-2
2-3
3-1
4-1

4-2

4- 3
4-4
4-5

5-1
5-2
5-3
5-4
5- 5
5-6
6-1
6-2
6-3
6

-4
6-5
6-6

6-7
6-8

6-9
6-

10

6- 11

6-12

6-

13

6-14

6-15
6-16
7- 1

7-2

7-3

7-4

7- 5
7- 6

7-7
7-8
7-9

7-10

7-11

900C-1()
900C-1()

Test
Local
Front

900C-1B

and

900C

Stereo,

Pulse
Stereo
Elementary
Typical

Typical
Factory
Test
Test
Test
Front
Top

Bottom
Rear
Left
Oscillator-Tripler-Mixer
Pulse
Phase
Peak
Peak
Average
19-Kc
Amplifier
Stereo
Stereo
Audio
Oscillator-Tripler-Mixer
Pulse
Phase
Peak

Peak
Average
19-Kc
Amplifier-Doubler
Stereo
Audio
900C-1()

(Cl021-13

FM
FM

Point

and
Oscillator
Panel

Control

and

900C

SCA)

-1

Setup
Switch for
Setup

View,

View,

Side View,

Voltmeter

Light

Voltmet

Light

(Cl02

and

900C-1A

and

SCA) (C1021-

Counting

Demodul

Time
900C-l()
Wide-Band

Adjustment

for

for

View,

Parts

Parts

View,

Parts

Counting

Splitter

A5,

Voltmeter

Amplifier

Doubler

Demodulator
Demodulator

Amplifier

Counting

Splitter

er

Card

Voltmeter

Amplifier

Demodulator

Amplifier

FM

-6B) . .

Modulation
Modulation

Adjustment

Crystal Location

and

- 1C

FM

1-15-5) ...

FM

Demodulator
ator 19-Kc and 38-

Division

Waveforms

Output

Locations

Modulation

Obtaining

Stereo

Parts

A3,

Card

Modulation

Demodulator

Location

Location

Location

Location

Parts

Location

Demodulator

Parts

A4,

Parts

Parts

Location

A6,

Parts

A7,

Parts

AS,

Parts

A9,
A9,

Al0,

Parts

Demodulator

A3,

Card

A4,

A5,

Schematic

Card

Card A 7,

Card

Card

Cards

Al0,

...........•...............

Monitor
Monitor,

Locations

Indicat

or

Modulation

. .

Modulation

02-6)

Waveforms

Multiplex

(Cl021-19-P2)

Waveforms

(C1021-14- 2)

Meter

Stereo

Al,

Location

Parts

Rear View

Schematic

Schematic

A6,

A8,

A9,

Monitor

Signals

(C1021-34-P)

(C1021-37-P)

(C1021-41-P)

(C1021-40-

Parts

A2,

Location

(Cl021

Location

Location

Location

Location

Location

Card

Al,

Card

Diagram

Schematic

Schematic

Schematic

Schematic

All,

(C1021-35-P)

Outline

(C1021-36-P)

Locations

. . . . . . . . . . . . . . . . . .

Kc

Calibration

Adjustments

(C1021-38-P)

Parts

(C1021-30-P)

with

Schematic

A2,

Diagram

Schematic

Chassis,

and

of

Oscillator-Tripler-Mixer

Monitor,

..

...

Monitor, Block

with

Outputs

System

(C1021-18-P)

(Cl021-20

.

..

P)

.

Loc

atio11

Location

(Cl021-42-P)

- 33-

P)

(C1021-27-P)

(C1021-29-P)

(Cl021-32-P)

(C1021 - 31 -

Shield

(C1021-24-P)

Schematic

Diagram

(C1021-12-4)

Diagram

Diagram

Diagram

Diagram

Schematic Dia

.....

Mounting

. . . . . . . . .

(C102

1-39-P)

Block

Diagram

..

....

Diagram

Sine

Wave

with

Phase

(Cl02

1-17-3)

. .

..

.

.....

Adjustment

-3)

(Cl021-23-4)

(C

1021-

(Cl021-25-P)

.

. .

.....

.

..

.

P)

Removed,

....

Diagram

Diagram

(C1021-09-4).

(Cl021-04-4)

(Cl021

(Cl021-06-3)

(C1021

(C1021-07-4)

Diagram

.

Dimensions

. . . .

(Monaural
.
(Monaural,

Modulation

Changes

.

(Cl021

28-P)

Parts

.

(1021-01-5)

(Cl021-ll-4)

..

. . . .

- 03 - 4)
. .

-08-4).

(Cl021-10

gram

......

Al

..

. . .

(Cl02

- 21- 3)

Location

....

- 4)

(C102

...

(Cl021-05-4)

(C1021-

(C1021-22-3)

..

1-1

26-P)

1-16-3)

. . . . . . .

(C-1021-43-P)

.

3-6A)

Page

.
.

.

1-1
2-2
2-5
2-5
3-2

4-3

4-4
4- 5
4-7
4-8
5-4
5-5
5-5
5- 6
5

-8
5-9
6-9

6-10

6- 11

6-12
6-13
6-

14
6-15
6-16
6-17
6-18
6-

19
6-20
6-21
6-22
6- 23
6-24

7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9

7-10

7-12

iii

www.SteamPoweredRadio.Com

list

of

tables

Table

1-1

1-2

1-3

2-1

2-2

3-1

5-1
5-2

Available
Equipment
Diode,
Terminal
Local
Control
Typical
Test

Transistor,

Oscillator

Test

Equipment

Equipment

Supplied

Strip

TBl

Functions

Point

Required

. . . . . . . . . . . .

for

Each

900C-1( ) Model

and

Fuse

Complement

Functions

Crystal

. . . . . . . . . . . . . . . .

Voltage

. . . . . . . .

Frequencies

Measurements

for

Adjustment

and

.

...

Part

. . . . .

Procedures

Numbers

Page

1-2
1- 2
1-5
2- 3

.

2-3

3-1

5-3

5-4

iv

www.SteamPoweredRadio.Com

.,,---...

,

1.1

Purpose

This

instruction

sary

for
900C-l(
book

used
m

odu

1.2

The Collins

to
a

stereo

)
also
as

an

lation monitor.

Purpose

measure
commercial

multiplex,

of

Instruction

book contains

installing,

FM

contains a theory

aid

of

900C-l()

transmitt

ope

rating,

Modulation

in

und

erstan

Equipment.

FM

er

mod

FM

broadcast station,

opera

ting in the

Book.

the info

and

Monitor.

of

operation

ding the

Modulation

ulati

on

standard

rmati

on

neces

maintaining the

This instru

section

operation

Monitor

characteristics

monaural

ction
to

of

is

used

frequency

be

the

of

or

section

general

modulated
In

addition, the

-

tremely
station

1.3

Description

1. 3.1

The

900C-1()
1-1,
a

nd

is
inches
pending
constructed

broadcast

900C-1

accurate

's audio monitors.

PHYSICAL

is

constructed

19

inches

deep

on equi

FM

of

Equipment

DESCRIPTION.

FM Modul

wide,

and

weighs

pment

on

wired circu

band

of

( )

demod

ation

on a standard

10-15

/ 32 in

approximately

type. Individual

descr

88

to

108

megacycles.

may

be

used

ula

tor

for driving the

.

Monitor,showninfigure

19-in

ch r

ack

ches high,

35

pounds

circuits are

it

cards

mounted

iptio

as

an ex-

mount

14-1

5/ 32

in a

1

n

de-

1'?) •

~

Plf<'

. t

"IT

¥-00lh.4'f

~

~-

;

,""'

"'~

~-

¾

.

""

Figure

1-1.

900C

- l ( )

FM

Modulation

Monitor

1-1

www.SteamPoweredRadio.Com

SECTION!
General

Description

separate

shield

ed
is located within the
controls

with
hind a hin
are located
l

ower chassis. Th

p

uts
chassis,
bl

ock

1.3.2

The
sensitivity,
monaural
tering
modulation
cha r
modulation lig

average

c

hann

p

ilot

injection leve

(ster

models
subchannel
circuit
th

ese function

modulati

Outputs

monaural out
onl
a d
a

19-kc pil

a

frequency
900C-1( ) may
light
l

ong

are located

seldom used

ged

front

within the

and

outputs

on

are located on

individual

.

ELECTRICAL DESCR

900C-1( ) is

crystal con

or

stereo

and

testing

monitor to

acte

risti

cs.

ht,

reading

el

separation

carrier

voltmeter,

injection level (stereo

l (SCA

eo

models onl

onl

y),

main

audio

(stereo

to

set

the incoming

s , the

on

in

both

obt

ain

ed

from

put

, a l

y) , a

right

channel audio

istorti

on

meter

ot

carrier

meter

be

and

the

modulation mete

remote

loop.

compartment.

900C-

l ( )

case.

on the

controls

panel

front

and

door.

test

monitor · dust

e a-c

power

input

the

connectors,

IPTIO

basically a fully

trolled,

multi

plex

provisions

superheterodyne,

receiver.

are

measure transmitter

Th

ese

provisions

a

peak

reading

and

and crossta

lk

models only),

y),

right

channel audio

channel

aud

io

models

r-f

900C-1()

pos

itive and

the

eft cha

output, a

outp

is

designed

modulation

nnel

output

outp

ut

wide-band

ut

(st

ereo
output. Remote
externally

provided

r, eith

This

compartment

Most oft

panel of

Factory

points

the

900C-

located

adjustments

cover

and

monitor

rear

of the

900C-1

or

on a rear

terminal

N.

transistoriz

Various

contained

includ

within

e a

voltmeter,

methods

of

(stereo models

mode

ls

only),

left channel audio

(stereo
only),

leve

models

andametering

l.

In

addition

to

measure

negative dire

monitor

incl

(stereo

(stereo

models only),

audio output,

models

only),

monitoring

for

the

er

in a short

en

used

l ( )
be-

on

the
in-

( )

ed

low

FM

me-

the

outp

ut

peak

an

reading

only),

SCA

(stereo

only),

to

ctions.

ude a

models

and

of

the

peak

or

1.4

Equipment Supplied.

The 900C-l( ) is
Each

model cons
circuit
chassis
letion

fun
f

or
1-2
cards

1.5

The

complete

cards

and

of these

ctions.

each

lists

and

Table

model

the

filters

Equipment Required but not Supplied.

900C-1( )

unit
operation. See
interconnec

ting cabling required.

TYPE

900C-l

Contains
stereo,
toring

900C-1A

C
stereo

available

ists

of a main

placed

in

removeable

cards

cha n

1-1

gives

and a short

different

supp

lied

FM

Modulation

and

requires

section 2 of

TABLE

AVAILABLE

FUNCT

monaural,

and

SCA

functions

ontains

monaural

monitoring

in

four

chassis,

the

card

SCA

filt

ges

the

the

description

models

with each

Monitor

no

external

this

1-1

EQUIPMENT

ION

moni-

and

different

optional

holder

of

ers. Addition

modulation

Collins

and

the

part

of

eac

wired

.

is supplied

equipment

instructi

on

COLLINS

PART

NUMB

522-3275-00

522-3483-00

models.

wired

the

main

or

de-

mon

itor

numbers

h.

Table

circuit

as

for

book

for

ER

a

functions

900C-1B

Contains
SCA

monitoring

monaural

and

522-3484-00

functions

a

900

C-1C

Contains monaural

522-3485-00

monitoring functions

TABLE

CIRCUIT

AND

CARDS

FILTERS

Oscillator­Tripl

er-Mixer

Al

Pulse

Counting

D

emodulator

Phase Sp

litt

A2

er

A3

eak

Voltmeter

P

A4

Peak

Lig

ht

A5

1- 2

1-2.

EQUIPMENT

COLLINS

NUMBER

528

-0430-00

5

28-0431-00

528-

0432-00

528-0433-00

528- 0

434-00

PART

SUPPLIED

900C-1

FOR

EACH

900C-l()

EQUIPMENT

900C-1A

X X X X

X X

X X X

X

X X

X X X

MODEL

TYPE

900C-1B

X X

X

900C

- 1C

X

,,--....

X

www.SteamPoweredRadio.Com

General

SECTION

Description

1

CIRCUIT

AND

Average

Voltmeter

19-Kc
A7

Amplifier-Double
AS

Stereo
lator

Audio
Al0

Audio
A

ll

Filters

FL4,

CARDS

FILTERS

A6

Amplifier

Demodu-

A9

Amplifier

Amplifier

FLl,

FL5

FL2,

TABLE

r

1-2.

EQUIPMENT

COLLINS

528-0435-00

528-0436-00

528-0437-00

528-0438-00

528-0439-00

528-0439-00

PART

NUMBER

SUPPLIED

900C-l

X

X

X

X

X

X

X

FOR

EACH

900C-l()

EQUIPMENT

900C-1A

X

X

X

X

X

X

X

MODEL

900C-1B

(Cont)

TYPE

X

X

900C-1C

X

X

Filter

1.6

1.6.1

Size

Weight:

900C-1

900C-1A.

900C-1B.

900C-1C.

Ambient

Ambient

Altitude.

FL3

Equipment Specifications.

MECHANICAL.

• • • • • • •

temperature

humidity

rang

range

e .

5/ 32

X

inches

knobs

F).

high,

and

14-15

rear

/ 32

fuse

X

19

inches

inches long

holder).

38.5

37. 7 pounds.

33.4

32.6

0°C (32°

0

to

10,000

pounds.

pounds

pounds.

F)

95

percent

ft

maximum.

wide,

10-1

(including

.

to

+50°C (+122°

relative humidity.

Mounting

1.6.2 ELECTRICAL.

Power

source

. . .

Standard

19-inch

100 to 125 volts

50-60

cps.

rack

rms

pane

or

l.

200

to

240

volts

rms,

1-3

www.SteamPoweredRadio.Com

SEC'.l'ION 1
General

Input

Frequ

R-f

R-f

Description

power

ency

input

input

. . .

ran

ge

impedance

voltage

range.

. .

50

watts

Any
from

50

ohms,

4

to

one

88

10

of

volts

maximum.

to

100

FM

broadcast

108

megacycles.

unbalanced.

rms.

channel

frequencies

Oscillator

Local

Reference

Intermediate

deviation:

. . . ±35

. ±50

frequency.

Modulation meter

Peak

modulation

Frequency

Monaural

Stereo

Signal-to-noise

Monaural

response:

.....

(900C-l

ratio:

.....

accuracy

indi

cator

and

. . . . . . . . . . . . . . .

900C-1A

only)

cps,

cps,

500

kc.

Better
centage

Peak

light

tive

peaks

±0.5

db
standard
can

be

±1.0

db
standard
can be

75

db

with

0°C

to

+50°C (+32°F

0°C

to

+50°C (+

than 5 percent

of

modulation

adjustab

50

from

to

120

50

le

cps

75-microsecond

switched

from

in

50

or

cps

75-microsecond

switched

in

or

75-microsecond

32°F

modulation

up

to

to read

percent.

to

out

as

to

out

as

to

+122°F).

to

+122°F).

at

133

percent.

positive

15

kc

equipped with

de-emphasis

desired.

15

kc

equipped

de-emphasis

desired.

de-emphasis.

any

or

per-

nega-

which

with

which

Stereo

Distortion:

Monaural

Stereo

Channel

(900C-1

Crosstalk
and

900C-1A

Output

Wide

voltage

band

Monaural

Stereo

Distortion

(900C-1

(900C-1

separation
and

900C-1A

measurement

only).

and

aud

io

audio

meter

and

900C-1A

and

900C-1A

measurement

only)

only)

......

capab

ility (900C-l

only)

capability

. . . . . . . . . . .

impedance:

. .

55

db

0.25

percent

percent

0.5

percent

percent

40

db

45

db

channel

400

mv

775

0.

0.775

10

volts

with

75-microsecond

maximum,

modulation.

maximum,

modulation.

from

50

main

channel to

to

main

peak

to

volt

rms

volt

rms

rms

cps

to

channel.

peak

at

600

at

600

at

50

15

kc.

subc

at

600

ohms,

ohms,

10,000

de-emphasis.

50

cps

to

15

cps

to

15

hannel , 45

ohms, unbalanced

unbalanced

unbalanced

ohms,

unbalan

kc,

kc,

db

(O

(0

at

100

at

sub-

dbm).

dbm).

ced.

90

.

~

1-4

www.SteamPoweredRadio.Com

1. 7

Semiconductor

Table

1-3

shows

and

Fuse

Complement.

the

diode, transistor, and

fuse

complement

of

the

900C-1()

FM

Modulation

General

Monitor.

SECTION

Description

1

SYMBOL

OSCILLATOR-TRIFLER-MIXER

CRlO0

Ql00

Ql0l

Ql02

Ql03

~ --

PULSE

CR150

CR151

CR152

Q150

Q151 2N706

Q152

Ql53

Q154

Q200

Q201 2N697
Q202
Q203

CR250
CR251
C

R252

Q250

Q251

Q252

TABLE

TYPE

1N716A

2N2380

2N2362

2N2362

2Nl225

Voltage

Mixer

Local

Tripler

Reference oscillator

COUNTERING

1N270

1N270

Switching

Triggering

1N3022A Vo

2N706

One-half

One-half

2N706

2N706

2N2380

PHASE

2Nl225

One-half

One-half

Buffer

SPLITTER

Amplifier

Phase
2N697
2Nll

PEAK

1

N270
1N270
1N270

2N1225

2Nl225

2Nl285

Amplifier

75A

Amplifi

VOLTMETER

Blocking
Cl
Rectifier

Amplifier

Emitt

Peak dete

1-3. DIODE,

FUNCTION

limiter

oscillator

DEMODULATOR

ltage

limiter

pulse

generator

pulse

generator

multivibrator

multivibrator

A3

splitter

er

A4

amp

er

follower

ctor

TRANSISTOR, AND

Al

A2

FUSE

SYMBOL

TYPE

PEAK

Q253
Q254

2N1225
2N1225

Q255 2N1225

Q300

Q301

Q302

Q303

Q304

Q305
Q306

Q307

2N697

2Nl605

2Nl605

2Nl605

2N1605

2N697
2N526

2N526

AVERAGE

CR350

CR351

CR352
CR353

Q

350

Q351
Q352

Q353

Q354

1N270

1N270

1N270

1N270

2Nll

2Nl225
2N1225

2N1225

2Nl225

AUDIO

(900C-1

Q400

Q401

Q402

2N526

2N526

2N526

COMPLEMENT

VOLTMETER

Feedback
Peak

amplifier

Emitt

er

PEAK

LIGHT

Amplifier

One-half

One-half

One-half

One-half

Switching
Amplifier

Buffer

VOLTMETER

Rectifier

Rectifier

Rectifier
Rectifier

75A

Amplifier

Amplifier
Emitter foll

Amplifi

Amplifier

AMPLIFIER

. AND 9

00C-1A

Amplifier

Amplifier

Amplifier

FUNCTIO

A4

(Cont)

bias

follower

A5

pulse

generator

pulse

generator

multivibrator

multivibrator

ower

er

Al0,

ONLY)

N

A6

All

1-5

www.SteamPoweredRadio.Com

SECTION

ral

ene

G

1

on

ripti

esc

D

SYMBOL

CR450

Q450

Q451 2N

CR500

1 1N270

CR50

Q500

Q501

TABLE

1-3.

TYPE

MODULA

STEREO

(900C-1

FA4000

2N706

706

DE

900C

AND

od

Dem

Amplitude

Amplitude

ulati

AMPLIFIER-DOUBLER

900C-1A

(900C-l

1N270

2N1285

2Nl285

AND

Doubl

Doubl

Amplifi

Phas

er

er

e s

DIODE,

FUNCTION

TOR

A ONLY)

-1

on

correc

correction

ONLY)

er

er

plitt

TRANSISTOR, AND

A9

amplifier

tion

amplifier

AB

FUSE

SYMBOL

Q550

Q551

CRl

CR2

CR3

CR4

CR5

Fl

COMPLEMENT

TYPE

19-KC

(900C-1

2N526

2N526

AMPLIFIER

AND

Amplifier

Buffer

MAIN CHASSIS

1N830A

D

1N538 R

1N538

10Ml02Bl

1Nll24A

1/ 8 a

Rectifier

Vo

Re

COMPLEMENT

FUSE

Oven

mp

(Cont)

900C-1A

tor

etec

ectifie

ltage

fier

cti

heat

FUNCTION

A 7

ONLY)

r

limiter

protection

er

Q502

2N1285

Am

lifier

p

F2

1/ 2

amp

D

emo

dul

ator

protection

1-6

www.SteamPoweredRadio.Com

king.

c

Unpa

2.1

npacking

u

en

Wh
equipment

ma

da

uld

co

equipment

the

ng

ki

c

pa
promptl

ack

p

equipm

m

2.2

2.2.1

y

mat

g

in

nt

e

be

as

h

ent

Installation Procedures.

MOUNTING.

throu

ge

for

e

with

er

aga

en r

gh

e

th

hysical

p

quipm

th

ial

inst

ece

900C-1 (

the

e of

us

equipment

damage

ent.

transport

e

pro

for

packin

the

.

ved

i

careless

damage

If

of of

avoid

},

any

in

immedi

n

tio

a

damage

slip

g

amag

d

procedures

way. I

te

a

,

ts

is

ex
compan

im.

cla

sure

be

to

nspect

after

ly

e a c l

fil

y.

Check

a

in

which

Save

equ

ll

g

th

ll

a

n-

u

aim

all
the
ip-

2

secti

on

installation

-

con

which

Tl

er

rm

o

nsf

a

tr

om

fr

wires

ct

nne

co

Dis

b.

terminals

nect

sfo

The

ope

a

er

rm

900C-1()

ra

e

4

se
to

c.

of

Connect
tran
es.

ri

cps

60 -

to

1

jump

Tl

tion.

and

3

wire

er

toplacethetw

WARNING

220-volt

ch

equ

at

anged

pm

i

220-volt

to

to
th

e r

e

to 220

nt

changed

en

Wh

ocated

3 l

Jl

also

is

volt

-

115
converted

4.

to

2

te

from

eady

now r

is

er

op

900C-1 ( )

the

of

r

ea

volts.

to J13 when

ope

ion.

at

r

rm
o

a

pri

the

ina

for

I

on

ti

Do

l 1 to te
ariesofTl

m

220-

n

con

,

chassis
connect

not

900C-1

rminal

volt

tor

ec

()

in

50-

is

e 900C-1

Th

mounted

be

ed

t

oun

m

or

ove

ab

modulation

the

by

monitor

on

ti

eq
sideration
which

around

bi

50
thi
heter
ac

Mo

no. 10

w

and

ent

uipm

a

ch

nt

e

degrees

mperatu

s te

odyn

uracy.

c

th

unt

hers.

as

mountin

EXTERNAL

2.2.2

2.2.1

2.
era

op

for

sis

as

ch
powe r

part

as
operation

60 cps .

to

50

115

fo r
220-volt

Remov

a,

resistor

This

chass

the

FM

()

a

in

ra

a

in

th

below

is

such

shou

fr

a

llow

900C-1

e

th

temp

s

ssi

a

C (122 d

r e w

crystal

g

in

e 900C- l ( )

screws

Refer to

dim

g

POWER

of

tion

thr

panel

whi

le

cab

e m

th

of

ith

is e

The

50-

volt

­operation,

the

e

s.

i

Mo

standard

k,

c

unit

e

monitor.

mount

vacuum-tube

as

ld be g

mov

ee

( ).

er

and

figur

en

CONNECTIONS.

CONNECTIONS AND CHANGE.

e 900C

th

ugh

o

fast

ch

ulation

od

er

to

wir

located

is

cooling

no

as very

above

ed

en

iv

ment

e

In

e be

ur

at

ree

eg

cause

ill

ult

es

r

the

to

ht

eig

e

drawing.

on

si

-1

a r

ens

volts

115
900C-l

cps

60-

perform

e sh

19

H

no

s

ac

r

no,

2-1

( }

eces

to

on

m

()

orting

in

r

inch

­a

are

little

r,

oweve

gh he

hi
power

coo

to

coo

of
instance

allowed

An

F).

quency

e

fr

in

ing

unt

k mo

unt

co

10

an

for

on

c

is

male

ed

s

connecto

s

thi

itor.

to

50

received

as

ation.

per

o

followingprocedures:

the

25- wa

lower r

the

oun

k m

ac

be

d

nee

is

t

ea

h

th

en

wh

at

supplies,

eq

ng r

li

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SECTION

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SECTION
Installation

2

TERJ.vIINAL

CONNECTION

NUMBER

These

same

customer's
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STRIP

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TABLE

CRYSTAL

FREQ FREQ

(me)

29.53333
29

.60000

29.66666

29.

73333,

29.80000

29.86666

29.93333

30.00000

30.06666

30.13333 89.9 289-6229-00 30.80000 91.9 289-6239-00

2-2.

LOCAL

CHANNEL

(me)

88.1

88.3

88.5

88.

7

88.9

89.1

89.3

89.5

89.7

OSCILLATOR

COLLINS

PART

NUMBER

289-6220-00
289-6221-00
289-6222-00
289-6223-00
289-6224-00
289-6225-00
289-6226-00
289-6227-00
289-6228-00

CRYSTAL

FREQUENCIES

CRYSTAL

FREQ

(me)

30.20000

30.26666
30

.33333

30.40000

30.46666

30.53333

30.60000

30.66666

30.

73333

AND

PART

CHANNEL

FREQ

(me)

90.1

90.3

90.5

90.7

90.9

91.1

91.3

91.5

91.

7

NUMBERS

COLLINS

PART

289-6230-00
289-6231-00
289-6232-00
289-6233-00
289-6234-00
289-6235-00
289-6236-00
289-6237-00
289

-6238

NUMBER

-00

2-3

www.SteamPoweredRadio.Com

SECT

ION 2

Installation

T

ABLE 2-2.

LOCAL

OSCILLATOR

CRYSTAL

FREQUENCIES

AND

PART

NUMBERS

(Cont)

CRYSTAL

FREQ FREQ

(me) (me)

30.86666

30.93333

31.00000

31.06666

31.13333

31.20000

31.26666

31.33333

31.40000

31.46666

31.53333

31.60000

31.66666

31.

73333

31.80000

31.86666

31.93333

31.00000

32.06666

32.13333

32.20000

32.26666

32.33333

32.40000

32.46666

32.53333

32.60000

32.66666

32. 73333

32.80000

32.86666

32.93333

33.00000

33.06666

33.13333

33.20000

33.26666

33.33333

33.40000

33.46666

CHANNEL

92.1

92.3

92.5

92.
92

.9

93.1

93. 3

93.5

93.7

93.9

94.1

94.3

94.5

94.7

94.9

95.1

95.3

95.5

95.7

95. 9

96.1

96.3

96.5

96.7

96.9

97.1

97.3

97.5

97.7

97.9

98.1
98

.3

98

.5

98.

98.9

99.1

99.3

99.5

99.7
99

.9

CO LLINS

PART NUMBER

289

-6240-

00
289-6241-00
289-6242-00

7

7

289

-6243­289-6244-00
289-6245-00
289-6246-00

289

- 6247 -

289-6248-00
289

- 6249 -

289-6250-00
289-6251-00
289-6252-00
289-6253-00
289-6254-00
289-6255-00
289-6256-00
289

-6257-

289-6258-00
289-6259-00
289

-6260-

289-6261-00
289-6262-00
289-6263-00
289-6264-00
289

- 6265 -

289

- 6266­289-6267-00
289

- 6268­289-6269-00
289-6270-00
289-6271-00
289-6272-00
289-6273-00
289-6274-00
289

-6275­289-6276-00
289-6277-00
289-6278-00
289-6279-00

00

00

00

00

00

00
00

00

00

CRYSTAL

FREQ FREQ

(me) (me)

33.53333

33.60000

33.66666

33.

73333

33.80000

33.86666

33.93333

34.00000

34.06666

34.13333

34.20000

34.26666

34.33333

34.40000

34.46666

34.53333

34.60000

34.66666

34.

73333

34.80000

34.86666

34.93333

35.00000

35.06666

35.13333

35.20000

35.26666

35.33333

35.40000

35.46666

35.53333

35.60000

35.66666

35.

73333

35.80000

35.86666

35.93333

36.00000

36.06666

36.13333

CHANNEL

100.1

100.3

100.5
100

. 7

100.9

101.

1

101.3

101.5

101.

7

101.9

102.1
102

.3

102.5
102

.7

102.9

103

.1

103.3

103.5
103

.7

103.9

104.1

104.3
104

.5

104.

7

104.9

105.1

105.3
105

.5

105.

7

105

. 9

106.1

106.3

106.5

106.

7

106.9

107.1

107.3
107

.5

107

.7

107.9

COLLINS

PART

NUMBER

289-6280-00
289-6281-00
289-6282-00
289-6283-00
289-6284-00
289-6285-00
289-6286-00
289-6287-00
289-6288-00
289-6289-00
289-6290-00
289-6291-00
289-6292-00
289-6293-00
289-6294-00

289-6295-00
289-6296-00
289-6297-00
289-6298-00
289-6299-00
289-6300-00

289-6301-00
289-6302-00
289-6303-00

289-6304-00
289-6305-00
289-6306-00
289-6307-00
289-6308-00
289-6309-00

289-6310-00
289

-6311­289-6312-00
289-6313-00
289-6314-00
289-6315-00
289-6316-00
289-

6317-00
289-6318-00
289-6319-00

00

2-4

www.SteamPoweredRadio.Com

--

MIXER

OUTPUT

TPIO2

LOCAL

OSCILLATOR

TUNING

Figure

MIXER
INPUT

Cll8

2-2.

Test

TP

IOI

Point

and

Oscillator-Tripler-Mixer

TRIPLER

TUNING

Cll9

Adjustment

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Locations

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REFERENCE

OSCILLATOR

OUTPUT

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SECTION
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2

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,-------s.

www.SteamPoweredRadio.Com

,,.--..,,._

General.

3.1

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Th

operate

to

used

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900C-

stereo

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models

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proc

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first
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signal

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panel

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the

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PHASE

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RF LEVEL control

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percentage),

over

the

perform

all

­following

the

monitor

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gain

procedures.

3-1

www.SteamPoweredRadio.Com

SECTION 3

Operation

METER

SWITCH

SI

DECIBELS

SWITCH

S7

METER

ADJUST

CONTROL

R47

L

I

METER

Ml

PEAKS

INDICATOR

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POWER

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CONTROL

S6

MODULATION

METER

CALIBRATION

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Figure 3-1.

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SUB

CARRIER

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OFF

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TOT

AL

MOD

position.

b.

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the

MODULATION

ON

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3.1.3

MONAURAL SIGNAL/ NOISE RATIOMEASURE-

MENTS

Perform
monaural

a.

Place
position
0

position.

b.

Apply a monaural,
mitter

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the front

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the

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and

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to

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MAIN CHAN AUDIO

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to

the

rotate

indicated

MODULATION

METER

CALIBRATION

ADJUSTMENT

RII

Panel

Control

to

to

the

to

control

switch

-1C

).

the

MOD

to

the

trans-

on

the

switch

the

on

SUBCARRIER

CALIBRATION

1

and

d.

the

DECIBELS

is

observed
noise
switch

3.1.4

To

measure

output,

a.
RF
the

RF

b.
an

rms
located
be

referenced

3.1.5

The

may

procedures.

SUBCARRIER

PHASE
SWITCH

S5

Indicator

Remove

ratio

and

the

the

on
is

meter

PHASE

CALIBRATION

ADJUSTMENT

Locations

400-cps

switch

the

meter.

the

algebraic

indication.

L2

monaural

clockwise

The

sum

AM NOISE MEASUREMENTS

900C-1B,

perform

Remove
LEVEL

LEVEL

The

AM

reading

on

the

all

and

noise

the

subpanel.

900C

-1C

AM

noise

the

following

modulation,

set r-f level

control.

may

be

vtvm

on

).

present

procedures.

turn

measured
the

AM NOISE

The

AM

to a carrier

FREQUENCY

(900C-l,

frequency

be

900C-1A,

response

measured

RESPONSE MEASUREMENTS

900C-1B,

of

the

transmitting

by

performing

signal

until

monaural

of

(900C-1,

on

METER

to

100

directly

noise

level

900C

and

an

indication

signal-to-

the

DECIBELS

900C-1A,

the

transmitted

switch

percent

by

jack,

which

voltage

of 1 volt

-1C

).

equipment

the

following

rotate

to

with

placing

is

should

rms.

---------

3-2

www.SteamPoweredRadio.Com

SECTION 3

Operation

a.

Place
position
modulation
Monitor

b.

Change
the

standard

400,

1000, 5000, 7500,

the

modulation

c.

The

,

standard
specified

d.

The

measured
only

or

given

in

3.1.6

DISTORTION MEASUREMENTS

900C-1A,

Channel
900C-1
ternal

( )

distortion
TORTION
subpanel.
the

METER

either

the

CHAN AUDIO

the

METER

and

adjust

at

400

the

output

of

the

signal

FCC

percentage

vtvm

indication

75-microsecond

by

the

FCC.

right

and

for

frequency

left

only

signal

step

b.

900C-1B,

distortion

FM

Modulation

measuring

METER

Each

channel

front

panel

LEFT

AUDIO, RIGHT AUDIO,

position.

switch

the

transmitter

cps

using a signal

the

signal

generator

modulating

10,000

constant

in

de-emphasis

left

stereo

response

and

repeating

900C-1C).

may

be

Monitor

jack

located

is

switch

in

the

for

generator

frequency

frequencies,

and

15,000

at

db

should

channels

by

inserting a right

the

measured

by

connecting

equipment

on

measured

to a selected

TOT

AL

MOD

100

percent

generator.

with a vtvm.

to

each

50,

cps,

keeping

100

percent.

follow

curve

may

frequencies

(900C-l,

using

to

the

DIS-

the

monitor

by

rotating

position,

or

MAIN

of

100,

the

as

be

the

ex-

This

monitor

3.1.12
phase

3.1.8

3.1.8.1

a.

Turn
Adjust
signal

at

400

b.

Turn
AUDIO
the

IN

until

c.

Remove
the

PECIBELS

the

meter.
sum

of

3.1.8.2
Repeat
and

right

NOTE

procedure

19-kc

for

adjustments.

STEREO

transmitter

NOISE MEASUREMENTS

calibrates

phase

the

only. Refer

stereo

generator

·

modulation

toparagraph

19-kc

(900C-l,

900C-1A).

LEFT

the

plus

CHANNEL NOISE MEASUREMENT.

the

DECIBELS

transmitter

pilot

carrier

switch

output

(100

to

for a left

percent

the O position.

total

channel

modulation

cps).

the

position.

position.

the

front

the

METER

panel

the

The

DECIBELS

front

Place

Turn

the

meter

transmitted

switch

left

until
channel
switch

panel

switch

the

DE-EMPHASIS

METER

indicates O db.

left

audio

an

indication

noise

and

the

meter

to

the

ADJUST

signal

and

is

is

the

algebraic

indication.

switch

control

noted

RIGHT CHANNEL NOISE MEASUREMENT.

paragraph

for

left.

3.1.8.1

substituting

left

for

LEFT

to

rotate

on

right

3.1.7

PHASE CALIBRATE (900C

To

calibrate

the

19-kc

accomplished,

Modulation
during

Be
0
PHASE CAL
may

a.

Adjust

carrier

b.

Turn

the

NOR

c.

Switch

to

the

d.

If

turn

the
between
When no
two

signals

e.

Return

to

the

pilot

this

sure

position

result.

the

at

the

position

the

REV

position

a

difference

ADJ
the
difference

are

OFF

position.

the

phase

carrier so

perform

may

procedure.

that

the

before

switch

station's

approximately

SUB

SUB

control

readings

exactly

the

SUB

of

the

the

NOTE

be

applied

DECIBELS

turning

or

transmitter

CARRIER

and

note

CARRIER

and

again

exists

until

in

the

between

in

CARRIER

-1,

monitor

exact

following

to

switch

the

damage

10

percent

PHASE CAL

the

reading

PHASE

note

between

there

NOR

the

readings

phase.

PHASE CAL

900C-1A).

subcarrier

zero

crossing

procedures.

the

900C-1(

is

in

the

SUB CARRIER

to

the

meter

to

transm

it a pilot

modulation.

switch

on

the

meter.

CAL

switch

the

meter

the

is

and

two

readings,

no

difference

REV

is

noted,

reading.

position.

switch

with

)

the

is

to

3.1.9

CHANNEL SEPARATION (900C

To

measure

the

right

a.

Apply

plus

pilot

b.

Place

LEFT

c.

AUDIO

Place
rotate
the

meter

d.

Switch
channel

in a clockwise
on

the

is

the

markings
To

obtain
applied
in

the
substitute
instructions

3.1.10

channel

channel,

100

carrier

the

separation with

perform

percent

from

METER

modulation

position.

the

DECIBELS

the

METER

indicates

from

modulation

front

algebraic

and

ADJUST

O db.

left

and

direction

panel

meter.

addition

the

front

channel

switch

until

panel

channel separation

to

the

left

channel

right

left

are

channel,

for

indicated.

right

repeat

and

CROSSTALK MEASUREMENTS
900C-1A).

To

measure

crosstalk,

3.1.10.1

a.

Turn

signals.

the

magnitude

perform

the

following

TRANSMIT MAIN CHANNEL, MEASURE

SUBCHANNEL

off

the

Turn

the

CROSSTALK.

transmitted

DECIBELS

-l,

audio

the

the

front

switch

front

following

station

panel

in

left

channel

transmitter.

switch in

the O pos

panel

control until

procedures.

modulation

the

DECIBELS

an

indication

The

of

the

meter

channel

DECIBELS

is

indication.

measurements

and

measurements

steps a through d and

right

for

left where

(900C-1,

of

main

and

procedures.

pilot

carrier

switch

to

0.

900C-1A).

applied

only

the

iti

on

and

to

right

switch

observed

separation

switch

with

audio
taken

these

subchanne

and

SCA

3-3

to

l

www.SteamPoweredRadio.Com

SECTION

3

Operation

METER

the

e

Plac

b.

adjust

MOD

position

percent

Turn

c.

rotat

and

indicat

as

Switch

d.
AUDIO
clockwise

met

panel

of

sum

modulation

position

e

th

and

METER

the

METER

the

e

th

on

ed

METER

the

an

until

e

Th

er.

DECIBELS

with

front

e

and

indication

crossta

indication.

.2 TRANSMIT SUBCHANNEL,

3.1.10
CHANNEL CROSSTALK.

transmitt

the

off

Turn

a.

DECIBELS

the

Turn

nals.

g

si

Plac

b.
MOD
percent

Do

c.

The

low
will

position

not

METER

the

e

and

modulation

METER

r es et

will

ter

me

tim

this

at

calibrated

be

adju

with

read

e.

for

panel

front

the

L

an

switch

ADJUST

l

pane

switch

rotate

value

lk

switch

ed

panel

nt

o

fr

the

st

L

an

ADJUST

NOTE

approximately

owe

H

db.

O

the

switch

transmitt

+R

=

MAIN CHAN AUDIO

to

in

er

signal.

control

meter.

SUB CHAN

the

to

DECIBELS

e

th

on

noted

is

e

th

is

db

in

indication

pilot

switch

-R

=

and

ME

carrier

O.

to

switch

transmitt

signal.

ASURE MAIN

th

in

er

control.

4.5

peak

the

ver

TOTAL

90

for

O

for

switch

front

the

algebraic

met

the

SCA

and

TOTAL

e

for

db

value

db

er

90

EXCITER

1.12

3.
900C-1A).

brin

To

nne

ubcha

s

a.

b. M

procedures

Brin

carrier

of

od

lowing

pilot

steps

signal.

btaining

for o

Pla

c.

AUDIO

Adjust

d.

er

i

carr

l ( )

900C-

3.1.13

eas

m

To

the

turn

th

ad

re

e p

th

is

14 SCA

3.1.

easure

To m

following

ereo

e st

th

g

gna

si

l

900C-1(

the

g

xactly

e

paragraph

the

ulate

figur

See

s

thi

monitor

e

th

ce

RIGHT AUDIO

or

e

th

e

has

p

pane

front

ure

C-l,

th

CA

e l

PILOT

(900

METER

output

e

carrier

ilot

INJECTION

(900C-1,

the

procedures.

PILOT

CARRIER

generator

exactly

ls

.

) s

in

7.

3.1.

transmitter

for

e 5- 5

of

type

METER

transmitter

maximum

a

for

meter.

l

l

sw

out

SCA

of

ch

it
the

A)

ut

p

LEVEL

the

injection

RRIER

900C-1

eve

on

00C-1B).

9

il

p

phase,

in

ubcarrier

e

phas

with

xample

e

an

stereo

position.

stereo

.

tran

PILOT

to

30

to

O

l.

e

lev

LEVEL

and

er

rform

transmitted

formin

er

=

L

test

a

of

(900C-l,

th

-R

PHASING

carri

ot

pe

and

p

by

an

signal.

the

switch

to

generator

tion

ca

i

ind

MEASUREMENT

carrier,

MOD

nt

e

rc

pilot

po
scal

siti

e.

mitted

s

pe

MEASUREMENTS

perform

l,

eve

l

stereo

fol

e

the

g

stereo
switch

LEFT

pilot

the

on

and

on

This

the

-

Switch

d.

eter

th

position
until
.

e

AUDIO

wise
m
of
indication

3.1.11

SUBCARRIER

900C-1A}.

measur

To

e following

th

Switch

a.

Turn

off.

Turn

b.

and app

MOD
Adjust

Turn

c.

position

MOD

e meter

th

until

Turn

ct.

METER

the

Rot

e.

tion

ec

dir
subcarrier

and

eter

m

METER

the

and

indication

an

ossta

cr

e

Th

DECIBELS

.

subca

the

e

procedures.

transmitt

the

DECIBELS

the

METER

e

th

an

ly

transmitter

the

METER

e

th

and

indi

e L

th

off

switch

DECIBELS

the

ate

a m e

until

suppression

DECIBEL

switch

DECIBELS

the

e

rotat

noted

is

db

in

e

lu

va

lk
switch

indicati

SUPPRESSION

pr

sup

er

rri

pilot

er

itch

sw

panel

front

ign

s

+R

=

L

90

for

switch

just

ad

tes

ca

+R

=

e SUB CHAN AUDIO

th

to

to

METER

the

db.

O

transmitter

switch

indication

ter

S

is

switch

the

in

dic

MAIN CHA N

the

to

switch

e

th

on

algebraic

the

is

and

on

(900C-l,

in

n

essio

carrier

0.

to

itch

sw

the

to

al

percent

e MAIN CHAN

th

ADJU

input

th

in

obs

is

algebraic

ation.

clock

panel

front

sum
ete

m

the

perform

db,

SCA

and

AL

TOT

to

transmitter.

modulation.

control

ST

ta

ro

and

clockwise

e

rv

e

um

s

po

ed

siti

.
of

on.

Th

the

te

SCA

to 30

O

dula-

check

at

od

m

MOD

ft

meter

any

e

e

th

.

on

.

of

-

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in

transmitter

e

th

into

t

inpu

Read

front

the

ope

set

en

th

g

li

S

allows

s

mo

of

METER

e

PERCENT

POLARITY

The

NEG

or

th

e

e

th

present

SCA

nt

fro

e SCA le

th

pan

,

on

rati

the

to

indicate

se

is

ht

the

im

st

dulation.

mo

m

for

switch

position.

ual

act

e
PEAKS

over

OTE

N

ch to

swit

panel

on

vel

meter.

el

900C-1(

e

th

rate

nt

ring

to

MDD

of

at
operator
function,

percent

e

th

TOTAL

percent

ope

to

t

station

ta

por

to

i

on

MODULATION

ma

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swi

front

The

of

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ht

g

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percent.

100

the

e

th

METER

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position.

mo

total

percent

100

to

th

of

TOTAL

control

y be le

el

n

pa

transmitter

icat

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normal

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a.

METER

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MOD

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3.2

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e m

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During
sw

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900C-1(

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ulation,

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er

th

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modulation
modulation

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turn

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3-4