Kenwood TL-922A User manual

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QKENWOOD

LINEAR

AMPLIFIER

Model

TL-922A

INSTRUCTION

MANUAL

AFTER

UNPACKING

It

is

advisable

to

save

all

original

packing

cartons

(inner

and

outer)

to

protect

your

valuable

Linear

Amplifier

from

damage

should

you

wish

to

transport

it

for

remote

opera-

tion

or

ship

it

for

after-sales

service.

The

following

explicit

definitions

apply

in

this

manual.

Be

sure

to

read

these

definitions:

NOTE

=

If

disregarded,

inconvenience

only

—

no

damage

or

personal

injury.

CAUTION

=

equipment

damage

may

occur,

but

not

personal

injury.

WARNING

=

personal

injury

may

occur

—

do

not

dis-

regard.

CONTENTS

TL-922A

SPECIFICATIONS

.

.

SECTION

1

FEATURES

..

. .

SECTION

2.

PREPARATION

FOR

USE

2.1

Accessories

2.2

Installation

of

Power

Tubes

2.3

General

Tips

on

Installation

2.4

AC

Power

Source

2.5

Line

Voltage

Change

2.6

Power

Cable

2.7

Exciter

2.8

Antenna

2.9

Interconnection

2.9.1

Grounding

2.9.2

Cable

Connection

SECTION

3

CONTROLS

AND

THEIR

FUNCTIONS

.

9

3.1

Front

Panel

3.2

Rear

Panel

SECTION

4

OPERATION

......

wee

ee

ee

eeeee

11

4.1

Prechecks

4.2.

CW

Operation

4.3

SSB

Operation

4.4

RTTY

Operation

4.5

Setting

the

ALC

ADJ

Control

4.6

Adjusting

the

RF

Output

Meter

4.7

High-Voltage

Transformer

Protection

4.8

Carrying

Your

TL-9224

SECTIONS

CIRCUIT

DESCRIPTION.........

13

5.1

Linear

Power

Amplifier

5.2

Power

Supply

5.3

Fan

Motor

Delay

Stop

Circuit

5.4

Meter

Drive

Circuit

5.5

Spark

Suppressor

CAUTION

Read

Operating

Manual

Section

2

before

proceeding

to

unpack

and

assemble

your

amplifier.

WARNING

LETHAL

VOLTAGES

PRESENT.

SECTION

6

MAINTENANCE...............-

15

6.1

Internal

Cleaning

6.2

Replacing

Power

Fuses

6.3

Replacing

Power

Tubes

6.4

Input

Matching

Circuit

SECTION

7

TROUBLESHOOTING

HINTS

.

PACKING:

iiss:0

ics

eis

Sa

tower

aa

oat

ILLUSTRATIONS

Fig.

2-1

Upper

Case

Cover

Assembly/

Disassembly

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

5

Fig.

2-2

Correct

Power

Tube

Handling

5

Fig.

2-3

Parasitic

Suppressor

Coil

Mounting

6

Fig.

2-4

Input

Voltage

Terminal

Boards

7

Fig.

2-5

Power

Cable

Color

Code

.

.

8

Fig.

2-6

Exciter

Connections

for

RL

and

ALC

Controls

.........

oii

eee

»

8

Fig.

2-7

Interconnection

of

the

TL-922A

......

8

Fig.

3-1

Front

View.......

beciegtsade

hice)

8

Fig.

3-2

Rear

View

Cees

eae

eehae

es

.

10

Fig.

5-1

Linear

Power

Amplifier

Circuit

.......

13

Fig.

5-2

Transformer

Primary

Current

Flow.....

14

Fig.

5-3.

Fan

Mogpr

Delay

Stop

Circuit

........

14

Fig.

5-4

Meter

Drive

Circuit................

14

Fig.

7-1

Packing

for

Shipment

.

17

Fig.

7-2,3Top,

Bottom

Views

18

TABLES

1.

Front Panel

Controls

Set-Up

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

11

2.

Tune

and

Load

Initial

Settings

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

11

Transmit

Frequency

Range:

Excitation

Energy

Required:

Mode

and

Duty

Cycle:

Rated

Plate

Input:

Plate

Voltage:

(at

No

signal)

Circuit

Type:

3rd

Order

Intermodulation

Distortion:

Input

Impedance:

Output

Impedance:

Cooling:

Interlock

Safety

Features:

Thermal

Protector:

Fan

Motor

Delay

Stop

Time:

ALC:

Power

Tubes

Used:

Semiconductors:

Power

Requirements:

Cables

Supplied:

Dimensions:

Weight:

sansa

-atnscnnctny

tans

ateesanntanectte

satan

stances

tate

tanta

taintedeity

satan

TL-922A

SPECIFICATIONS

sauicaap

tt

-ctacnastettttcn

att

enact

ta

anne

nnn

santa

sents

caat

an

-ant-atto

160m

through

15m

Amateur

Bands

80

W

nominal,

120

W

maximum

SSB,

continuous

for

30

minutes.

CW

and

RTTY,

key-down

continuous

for

10

minutes.

2

kW

P.E.P.

SSB,

1

kW

CW

RTTY

3.1

kV

SSB,

2.2

kV

CW

RTTY

Class

AB2

grounded

grid

linear

amplifier

Below

—30dB.

50 2,

unbalanced

at

better

than

1.5

SWR

50

to

75 2,

unbalanced.

Forced

Air.

Primary

high

voltage

circuit

cut-off.

Secondary

high-voltage

circuit

grounding.

Locks

out

transmit

relays

if

H.V.

power

transformer

overheats.

140

+

30

seconds.

(at

room

temperature)

Negative

going,

adjustable

threshold

-8V

DC

maximum

output

(typical).

Eimac

3-500Z,

two

pieces

Diodes,

18

pieces

Zener

diode,

1

piece

120V,

28A;

240V,

14A;

50/60Hz;

for

maximum

SSB

input.

Signal

cable

(coaxial)

with

UHF-type

connector,

1.5m.

Control

cable,

1.5m.

390mm

x

190mm

x

407

mm

(15-3/8

x

7-1/2

x

16”)

Net

31

kg

(68

Ibs.)

Shipping

38

kg

(83

Ibs.)

The

above

specifications

are

subject

to

change

without

notice

due

to

technical

im-

provement.

agate

statesman

att

The

TL-922A

is

a

Class

AB2,

grounded

grid

linear

amplifier

developed

by

Trio-Kenwood

through

ad-

vanced

high-power

technology

using

two

high-per-

formance

Eimac

3-500Z

power

tubes.

It

covers

all

bands

160

m

through

15

m

for

SSB,

CW

and

RTTY

modes

of

operation.

Unprecedented

Reliability

The

TL-922A

is

designed

to

provide

stable,

high

RF

output

power

for

extended

periods

of

continuous

use.

Engineered

with

Trio-Kenwood’s

advanced

circuit

and

mechanical

technology,

the

TL-922A

employs

two

rugged

3-500Z

power

tubes

to

their

full

advantage.

Low

Intermodulation

Distortion

Intermodulation

distortion

(IMD)

is

minimized

through

the

use

of

negative

R.F.

feedback.

Quick

Turn-On

Warm-up

is

not

necessary.

The

3-500Z

tubes

are

fast

heating.

Full

Safety

System

To

protect

you

against

any

possible

high

voltage

elect-

ric

shock,

your

TL-922A

has

a

double

safety

system

comprised

of

interlocking

switches.

One

interrupts

the

high

voltage

primary

circuit

while

the

second

directly

grounds

the

secondary

high

voltage

circuit.

Also

provided

are

bleeder

resistors

for

discharging

the

high

voltage

capacitors

and

“DANGER”

warnings

at

high

voltage

positions.

Please

observe

all

warnings,

they

are

for

your

protection.

Newly-Developed

Fan

Motor

Delay

Stop

Circuit

To

reduce

power

tube

deterioration,

your

TL-922A

has

a

newly-developed

fan

motor

delay-stop

circuit

comprised

of

a

thermal

delay

relay.

The

cooling

fan

will

normally

run

for

140

seconds

(Typ)

after

power

is

removed

from

the

unit

and

will

measurably

ex-

tended

tube

life.

Mode

Switch

for

Efficient

Linear

Operation

MODE

switching

is

provided

to

select

between

the

SSB

Mode

for

the

maximum

PEP

output

with

good

SECTION

1.

FEATURES

sustenance

canna

ta

10.

11.

12.

13.

linearity,

and

the

CW

Mode

for

low

power

consump-

tion

and

heat

generation

during

extended

periods

of

operation.

Linear

Amplification

Control

Switch

This

switch

is

capable

of

setting

your

TL-922A

in

the

straight-through

state

irrespective

of

the

standby

control

on

the

exciter.

Variable

Threshold

Level

(ALC

Detector)

The

ALC

circuit

will

accommodate

exciters

of

80

w

to

120

w

(nominal)

by

varying

the

ALC

threshold

level.

This

effectively

prevents

overdriving

the

final

power

tubes,

limiting

the

Amplifier

to

its

linear

range

and

guaranteeing

low

distortion

at

maximum

power.

Two

Panel

Meters

In

adjusting

or

monitoring

your

TL-922A,

one

meter

always

indicates

the

(Ip)

plate

current;

while,

with

the

other,

you

may

read

(Ig)

grid

current,

(RF)

relative

output,

or

(HV)

high

voltage.

This

facilitates

ease

of

operation

of

your

TL-922A.

Rigid

Mechanical

Structure

The

die-cast

side

panels

effectively

support

the

weight

of

the

amplifier

against

shocks

and

jarring

during

transportation.

Recessed

side

panel

handles

are

pro-

vided

so

the

Amplifier

can

be

easily

carried.

Vernier

Plate

Tuning

Dial

The

PLATE

tune

dial

is

equipped

with

a

reduction

gear that

facilitates

easy

tuning,

particularly

for

the

higher

bands.

It

also

effectively

prevents

accidental

miss-tuning

during

operation.

Controls

and

panel

arrangement,

designed

to

human

_

engineering

standards,

provide

superior

ease

of

operation.

Neat,

Contemporary

Appearance

Mechanical

arrangement

and

sophisticated

design

to

match

any

Trio-Kenwood

transceiver

or

transmitter.

Your

TL-922A

can

also

be

used

as

a

high-quality,

general

purpose

Amateur

band

linear

amplifier

with

any

exciter

capable

of

8OW

to

120W

RF

output.

2.1

ACCESSORIES

Carefully

unpack

your

TL-922A

Linear

Amplifier

and

check

that

it

is

supplied

with

the

following

accessories.

1,

Instruction

manual

B50-2587-00

1

copy

2.

Coaxial

cable,

1.5m,

with

UHF-type

connectors

X42-

1100-00

1

piece

3.

Control

cableW/8Pin

Plug

1

piece

(For

TS-520,

TS-820

Series)

X42-1110-10

4.

Control

cable

W/7

Pin

Plug

1

piece

(For

TS-120,

TS-130,

TS-180,

TS-430,

TS-530,

TS-830,

TS-930

Series)

X42-1110-11

5.

Spare

fuse,

15A

FO5-1533-05

2

pieces

6.

Extension

foot

JO2-0049-14

2

pieces

7.

Screws,

4

x

12mm

long

N30-4012-46

2

pieces

8.

Plate

cap

FO2-0407-04

2

pieces

9.

Parasitic

suppressor

coil,

right

hand

1

piece

L39-0401-05

10.

Parasitic

suppressor

coil,

left

hand

1

piece

L39-0402-05

11.

Screw,

3

x

6mm

long

N30-3006-46

4

pieces

12.

Plain

washer

N15-1030-46

4

pieces

13.

Spring

washer

N16-0030-46

4

pieces

2.2

INSTALLATION

OF

POWER

TUBES

To

protect

the

power

tubes

in

your

TL-922A

against

vibration

and

shock

during

transport,

they

were

packed

separately

from

the

amplifier.

For

insertion,

follow

the

procedures

below.

Prepare

the

following

mounting

hardware

and

tools:

Mounting

Hardware

Power

tube,

3-500Z

2

pieces

Plate

cap

2

pieces

Parasitic

suppressor

coil,

right

hand

and

left

hand

1

piece

each

Screw,

3

x

6

mm

long

4

pieces

Plain

washer

4

pieces

Spring

washer

4

pieces

Tools

Phillips

screwdriver

1

piece

Small

standard

screwdriver

1

piece

NOTE:

A

parts

tray

to

prevent

loss

of

metric

hardware

is

helpful.

WARNING:

Before

proceeding,

make

sure

that:

The

power

cable

is

NOT

plugged

in

the

wall

out-

let.

The

METER

switch

is

at

the

HV

position

and

the

multimeter

reads

OV.

Proceed

as

follows:

(Refer

to

Fig.

2-1)

1.

Remove

the

four

4

mm

Phillips

screws

holding

the

upper

case

cover.

2.

Remove

the

upper

case

cover.

3.

Remove

the

four

3

mm

self-tapping

Phillips

screws

and

four

flat

head

self-tapping

Phillips

screws

holding

the

inside shield

on

the

power

tube

enclosure.

Se

ee

SECTION

2.

PREPARATION

FOR

USE

teases

t-tests

=

sgtt-cnt-sun-tt

a

>

Remove

the

shield

plate.

5.

Take

the

tubes

out

of

their

case

(Refer

to

Fig.

2-2).

In

handling,

be

sure

to

hold

them

by

the

glass

envelope,

not

the

plate

cap.

6.

Carefully

index

the

pins

of

each

tube

into

its

socket

and

insert

gently

without

excessive

force.

INSERT

UPPER

4mm

CASE

COVER

r

ia

v

ical

LEADING

EDGE

INTO

FRONT

|

PANEL

TOP

LIP

HIGH

VOLTAGE

|

PRIMARY

PROTECTION

SWITCH

PLUNGER

}

3mm

FLAT

HEAD

Z

SELF-TAPPING

\,

wT

|

¥

SCREW

(4

PCS)

B

an

cree

INsiDe

42

HIGH

VOLTAGE

|

184

!

:

[SHIELD

PALTE

SECONDARY

PROTECTION

SWITCH

|

PLUNGER.

UPPER

CASE

Figure

2-1

COVER

INSERT

Upper

Case

Cover

D

ata

\2

Assembly/Disassembly.

SWITCH

USE

#2

Phillips

PLUNGER

Screwdriver.

Figure

2-2

—

Correct

Power

Tube

Handling

CAUTION

Particular

care

should

be

taken

not

to

strike

and

break

the

glass

tubes

during

installation.

Tube

break-

age

due

to

negligence

is

not

warranteed

th

(Refer

to

Fig.

2-3)

Temporarily

fix

each

parasitic

sup-

pressor

coil

on

the

plate

cap

with

the

letter

“R’”

or

“L”

facing

up.

At

this

time,

do

not

tighten

the

4

mm

screw

and

spring

washer,

but

snug

them

so

the

coil

may

be

adjusted.

8.

Mount

the

plate

cap

with

parasitic

suppressor

coil

on

each

tube

observing

the

right

hand

and

left

hand

coil

designations.

If

the

screw

holes

do

not

align,

shape

the

coil

by

slight

bending

or

extending

by

hand

for

precise

installation,

keeping

the

coil

below

the

level

of

the

plate

cap.

CAUTION:

Particular

care

should

be

exercised

in

not

applying

excessive

force

to

the

tubes.

9.

Carefully

tighten

the

screws

at

each

end

of

the

coil

while

holding

the

plate

cap

by

hand.

10.

Tighten

the

plate

cap

screw

using

the

small

standard

screwdriver.

11,

Check

to

assure

correct

installation

by

reference

to

Fig.

3-3.

NOTE:

1:

Before

installation,

check

each

parasitic

suppressor

coil

for

good

alignment

to

prevent

the

application

of

excessive

force

to

the

tubes.

:

Letters

“'R’

and

“’L”

on

the

coils

should

face

up.

:

Temporarily

install

each

coil

on

their

plate

caps

before

final

tightening.

Use

#

Philips

screwdriver.

Figure

2-3

—

Parasitic

Suppressor

Coil

Mounting

Tube

Installation

Checkout

1.

To

avoid

damage

necessitating

tube

replacement,

please

check:

a.

Power

tubes

are

free

from

scratches

or

other

physical

defects.

Tubes

are

fully

inserted

into

their

sockets.

Plate

cap

screws

tightened

securely.

d.

—

Screws

at

both

ends

of

the

parasitic

suppressor

coils

are

tightened

securely.

e.

Washers,

screws,

drivers

and

any

other

unneces-

sary

material

is

not

left

inside

the

unit.

ra

Refer

to

Fig.

2-1.

The

inside

shield

plate

includes

the

high

voltage

secondary

protection

switch

plunger

(a

bakelite

bar.)

Position

the

plate

so

that

the

plunger

will

securely

engage

the

spring

plate

for

ungrounding

the

plate

high

voltage.

3.

Install

the

upper

case

cover

with

its

leading

edge

in-

serted

(approximately

1

mm)

into

the

front

panel

lip.

This

cover

has the

high

voltage

primary

protective

switch

plunger.

Position

the

cover

so

the

plunger

will

engage

the

microswitch.

os

2.3.

GENERAL

TIPS

ON

INSTALLATION

Install

in

a

dry,

well-ventilated

area,

shaded

from

direct

Sunslight.

Your

TL-922A

must

have

a

minimum

clearance

of

15

cm

to

the

rear

to

allow

hot

air

at

50

to

70°C

to

exhaust.

Choose

an

operating

position

capable

of

safely

supporting

the

weight

of

the

TL-922A

(31

kg),

plus

all

the

other

station

equipment.

Level

your

TL-922A

in

operation.

The

heated

electrodes

in

each

power

tube

will

be

distorted

by

gravity

resulting

in

shortened

service

life,

if

slanted

beyond

10°.

2.4

AC

POWER

SOURCE

Use

an

AC

power

line

having

sufficient

current

capacity

or

the

performance

of

your

TL-922A

will

be

adversely

affected

by

inadequate

line

regulation.

In

the

worst

case,

do

not

deviate

more

than

+10%

from

the

rated

input

voltage

for

which

your

Amplifier

has

been

set.

2.5

LINE

VOLTAGE

CHANGE

WARNING

DISCONNECT

THE

AC

INPUT

POWER

CABLE

FROM

THE

TL-922A

BEFORE

PROCEEDING.

The

input

voltage

can

be

changed

to

either

240V

or

120V

as

required,

by

changing

the

power

transformer

input

links

located

in

the

duct

on

the

rear

panel.

NOTE:

The

TL:922A

was

factory

set

in

the

240V

position.

To

change

link

positions,

remove

the

access

cover

by

the

two

black

snap

fasteners.

Loosen

the

screws

holding

the

shorting

bars,

a

few

turns

only.

(Do

not

loosen

excessively

as

they

could

drop

into

the

Amplifier.)

Draw

each

shorting

bar

upward

for

removal.

Replace

the

shorting

bars

for

the

operating

voltage

desired

as

illustrated

in

Fig.

2-4.

Tighten

firmly.

Also,

be

sure

to

tighten

the

screws

from

which

the

shorting

bars

were

removed.

NOTE:

Fuses

need

not

be

changed

in

current

rating

when

the

input

voltage

is

changed.

CAUTION:

Excess

force

may

break

the

terminal

strip.

2.6

POWER

CABLE

The

power

cable

supplied

with

your

TL-922A

has

no

plug

at

its

end.

Connect

a

plug

mating

with

the

wall

outlet.

The

blue

and

brown

leads

are

power,

the

green

lead

ground

as

illustrated

in

Figure

2-5.

2.7

EXCITER

An

HF

Amateur

band

SSB

or

CW

transmitter

or

transceiver

having

an

RF

output

impedance

of

502

and

output

power

of

80W

to

120W

is

sufficient

to

drive

the

TL-922A.

Exciter

output

exceeding

120W

will

cause

overdrive,

resulting

in

shortened

power

tube

life

and

distorted

output.

To

limit

the

power

level

above

120W,

use

an

exciter

having

an

external

ALC

input

terminal.

CAUTION:

BE

SURE

TO

TIGHTEN

ALL

LOOSENED

SCREWS.

Use

#

Philips

screwdriver.

Spare

shorting

bars

are

secured

at

terminals

3

and

4.

a:

240V

setting

b:

120V

setting

Figure

2-4

—

Input

Voltage

Terminal

Boards

Trio-Kenwood's

transceivers

Series

TS-930, TS-830,

TS-820,

TS-530, TS-520,

TS-430, TS-180, TS-130,

TS-120

and

TS-900

and

transmitters

Series

TX/T-599

are

all

suitable exciters

and

will

match

the

TL-922A

in

de-

sign

as

well

as

appearance.

2.8

ANTENNA

Your

TL-922A

requires

an

antenna

having

a

50

to

752

impedance

and

providing

it

is:

(1)

Rated

for

2

kW

P.E-P

input

power

(2)

and,

exhibits

a

low

standing-wave

ratio

(SWR)

Desired

SWR

is

1.5

to

1.

or

less.

A

higher

SWR,

2

or

3

to

1,

may

cause

difficult

matching

with

your

TL-

922A.

Excessive

SWR

could

melt

the

coaxial

cable

and

antenna.

To

protect

your

TL-922A

against

adverse

SWR

effects,

use

an

antenna

tuner.

Note

that

feeder

radiation

due

to

mismatching

will

cause

TVI,

BCI,

or

similar

RFI.

BLUE

BROWN

TO

240/120V

LINE

TO

GROUND

GREEN

Figure

2-5

—

Power

Cable

Color

Code

EXCITER

TbooA

TRANSMIT

|

RL

CONTROL!

at

ee

ae

a

ee

ea

IDO

ras

RELAY POWER

'

SOURCE

RECEIVE

TO

ALC

i

'

CIRCUIT

cea

CONTROL

ALC

=

>

Figure

2-6

Exciter

Connections

for

RL

and

ALC

Controls.

2.9

INTERCONNECTION

2.9.1

GROUNDING

Connect

the

GND

posts

of

the

TL-922A

and

exciter

RFI.

to

prevent

possible

electric

shock

and

The

wire

used

should

be

as

thick

and

short

as

possible

and

run

to

a

good

earth

ground.

2.9.2

CABLE

CONNECTION

Interconnect

your

TL-922A

and

exciter

with

the

supplied

cables

as

illustrated

in

Figure

2-7.

NOTE:

If

you

use

an

exciter

of

another

brand,

replace

the

supplied

connector

with

one

appropriate

to

your

exciter.

The

exciter

used

must

accept

the

negative-going

ALC

voltage

from

the

TL-922A.

(The

ALC

output

at

no

signal

input

is

normally

positive

when

not

connected

to

the

exciter.)

The

RL,

or

standby

control,

in

the

exciter

must

be

switched

to

ground

in

transmit

mode,

as

illustrated

in

Figure

2-6.

NOTE:

Use

RG-8/U,

RG-11/U

or

heavier

as

antenna

cable.

NOTE:

If

an

SWR

meter

is

connected

between

the

TL-922A

and

the

exciter,

total

co-

axial

cable

length

must

not

exceed

1.7

m.

7

8

9

1

10

Figure

3-1

Front

Panel

View

3.1

FRONT

PANEL

1.

IP

Meter

The

IP

meter

reads

the

plate

current

flowing

through

the

power

tubes.

ON

AIR

Indicator

The

ON

AIR

indicator

lights

up

in

the

on-the-air,

or

transmit

MODE.

PLATE

Tuning

Control

This

control

permits

you

to

tune

the

plate

circuit

to

the

desired

transmit

frequency,

and

is

equipped

with

a

reduction

gear

for

easy

tuning.

Multimeter

The

Multimeter

can

read

the

Ig

(grid

current),

RF

(relative

power

output),

or

HV

(plate

voltage)

as

selected

by

the

METER

switch

STBY

Indicator

With

the

unit

turned

on,

shows

unkeyed

or

receive

state.

LOAD

Control

Impedance

matches

the

pi

network

to

the

antenna.

POWER

Switch

A

double

pole

switch

completely

disconnects

the

AC

input

from

the

transformers.

MODE

Switch

Set

for

SSB

or

CW.

For

RTTY

operation,

set

the

switch

to

the

CW

position.

10.

11,

METER

Switch

Selects

Ig

(grid

current),

RF

(relative

power

output),

or

HV

(plate

voltage).

BAND

Selector

Set

for

the

Amateur

band

in

which

operation

is

desired.

LINEAR

Switch

In

the

STBY

position,

the

exciter

runs

straight

through.

In

the

OPERATE

position,

the

Amplifier

automatically

keys

with

the

exciter.

5

6

7

10

8

Figure

3-2

Rear

Panel

View

3.2

REAR

PANEL

1.

Cooling

Fan

The

Cooling

Fan

cools

the

power

tubes

and

effectively

keeps

the

inside

temperature

from

increasing.

Be

careful

of

hot

air

(50°

to

70°C)

at

the

exhaust

port.

Line

Voltage

Change

Terminals

These

terminals

are

located

behind

the

rear

cover,

which

is

removed

by

pulling

the

two

snap

fasteners.

For

input

voltage

change,

please

refer

to

Section

2.5.

Serial

No.

Plate

This

plate

is

stamped

with

the

Serial

Number

of

your

TL-922A.

RF

METER

Control

This

control

is

used

to

calibrate

the

RF

output

read-

ing.

For

calibration,

see

Section

4.6.

ALC

ADJ

Control

This

control

is

used

to

adjust

the

ALC

voltage.

For

adjustment,

see

Section

4.5.

ALC

OUT

Jack

This

jack

feeds

the

ALC

voltage

out.

RL

CONT

Jack

This

jack

inputs

the

transmit-receive

relay

switching

ground

from

the

exciter

10.

11.

12.

RF

INPUT

Connector

This

UHF-type

connector

inputs

the

RF

signal

fed

from

the

exciter.

Use

the

supplied

cable.

RF

OUTPUT

Connector

This

UHF-type

connector

feeds

the

RF

output

to

the

antenna.

GND

Post

Use

this

post

to

ground

the

TL-922A

to

your

exciter

and

station

ground.

FUSE

Holders

(2)

Each

contains

a

15

A

fuse.

If

either

or

both

fuses

are

blown,

determine

the

cause

before

replacement.

POWER

Cable

AC

power

is

supplied

to

the

amplifier

by

a

three-wire

cable.

(See

section

2.6)