Kenwood TL-911 User manual

Ample

2KW

PEP

input

provides

high

power

operation

SSB.

class

grounded-grid

configuration

with

the

regulated

screen

grid

voltage

employed

assure

stable,

distortion-free

SSB

transmission.

‘The

linear

switch

can

set

for

additional

safety

(A1)

operation,

ree

overcurrent

detection

type

protection

circuit

added

prevent

heat

trouble

caused

abnormal

operations

and

assure

safe

tuning,

which

would

difficult

with

the

TV-application

tubes.

The

plate

currents

the

power

amplifier

tubes

can

monitored

individually

facilitate

determining

which

tube

defective

when

they

develop

flashing,

low-emission

trouble,

etc.

dynamic

balance

circuit

employed

make

power

sharing

uniform

among

the

power

amplifier

tubes.

This

enables

all

power

tubes

serve

with

full

efficiency

and

safety.

The

ALC

circuit

dual

type

which

centrols

both

Igi

and

Ig2

for

quality

transmission

over

extended

dynamic

range.

| |

SWR

meter

provided

for

quick

matching

the

antenna.

final

tube

box

with

efficient

heat

radiation

and

large,

powerful

cooling

fan

(with

6-vane)

are

employed

double

the

life

power

tubes.

TL-911

designed

desk

top

type,

the

same

construction

TS-515

transceiver

that

they

can

put

together

space-limited

table.

Switching

between

exciter

and

linear

amplifier

operations

simple

and

accomplished

switching

antenna-through

relay

means

the

linear

switch.

CONTENTS

ETERNAL

VIEW

ssc

seecc

dad

sitetenaesscete

reece

teats

TOP

CHASSIS

VIEW.......

eee

cee

eee

ene

eneete

sen

enaees

BOTTOM

CHASSIS

VIEW

.....

cece

eee

erent

teen

tees

CIRCUIT

DESCRIPTION

.....

0.0202

cece

eee

cert

eee

ents

6~8

TROUBLESHOOTING

.........0

cece

eee

ete

teen

eenes

neat

CONNECTING

REMOTE

CABLE

.........--+++++::

ree

ADJUSTMENT.

oouasulawiseugs

die

yyeuaeen

ude

aaa

aes

12~

VOLTAGE

MEASUREMENTS

TUBES

AND

TRANSISTORS

........---

—

PARTS

LIST

.....-

ere

BOARD

cctees

tten

oder

etewesw

bbe

noes

seeeeaeens

ene,

92.23

SCHEMATIC

DIAGRAM

......-.--ecseeceeeeeeeeeeeees

SPECIFICATIONS

COLOR

CODE

....

see

ence

eee

ene

Knob

Meter

(B31-0114-05)-—

(K21-0226-03)

Knob

(K21-0210-03)

Toggle

switch

Knob

(S44-2009-00)

(K21-0213-04)

Panel

(A20-0466-02)

Lampholder

Toggle

switch

(E15-0040-00)~~

(S44-2009-00)

Name

plate

VARA

(B40-0425-04)

2024-00).

eos

ante

che

Msi

ees

Receptacle

type

VR6

(RO3-2024-00)

(ar

(eomeaTieon)

Fan

(T40-0002-00)———_——

Case

(A01-0147-01)

ABoicaves

spcxseatc

sooo

sassac

eed

faa

eaabon

otc

aStaraleioeaicissonesnes

LEALLE

HORI

WKS

28340x

Receptacle,

type

Our

ane

Ho)

(E04-0115-05)

e.2.

Fuse

holder

~~~

VR5

(RO3-3048-00)—

(E15-0041-00)

eeeenene

anes

Nut

(M14-0053-00)

C44

(C90-0095-00)

C43

(C90-0094-00)

C28

(CE62AD2H

470

C29

(CE62AD2H

470

(6LQ6)

(LO9-0095-00)

awn

(6LQO6)

VR8

(R12-3001-05)

_——-

Fan

(T40-0002-00)

VR7

(R12-3001-05)

——

VR6

(1.P.L

SET)

cttw

LBL

OG)

(R12-3001-05)

Pana

VR5

(R12-3001-05)

——

VR4

(R12-3001-05)-————

—

(6L.Q6)

VR3

(RO3-2023-00)

—————!_

Pr}

vars

(R03-2023-00)

O45

296-00)

Wie

sae

6.0

yo)

Sewers

ee,

Pian

Seem

(S19-2003-00)

(6CWS5)

Pare

eae

eee

Bsasacesutitrcanieeasapnimneatceacencrnanoasasmnietsecsaoavanisicn

meena

(6LQ6)

BOTTOM

CHASSIS

VIEW

VR5

(RO3-3048-00)

Fan

(T40-0002-00)

VR6

(RO3-2024-00)

L10

(L33-0156-00)

Receptacle

type

(E04-011

5-05)

SBS

LRES4

FRF442.dTK5

Cbetrs

ssees

TCS

(CO5-0029-05)

(SO01-1008-00)

R1,

R3,

R5,

R7,

(RW

98G3D1004)

(S01-1007-00)

™

VR1

(R12-3031-00)

RL2

(S51-301

0-00)

C29

(CE62AD2H

470

.C44

(C90-0095-00)

eee

socket

"(EO01-0801-05)

-Nut

(N14-0053-00)

—————

(LO9-0095-00)

Fuse

holder

(E15-0041-00)

——————

(S44-2009-00)

RECTIFIER

UNIT

(S45-2001-09)

—-C28

(CE62AD2H

470

ome

C27

(CE62AD2H

470

-VC2

(CO1-016

1-00)

CIRCUIT

DESCRIPTION

OUTLINE

TL-911

linear

amplifier

circuit

shown

the

block

diagram

Fig.

The

hybrid

type

amplifier

employs

vacuum

tubes,

transistors,

diodes,

and

thyristor.

The

unitized

sections

are

arranged

that

each

unit

performs

different

function

the

amplifier,

thus

permitting

the

final

amplifier

section

completely

shielded,

and

the

rectifier

and

control

units

independently

mounted

the

printed

circuit

boards,

etc.

FINAL

POWER

AMPLIFIER

SECTION

The

five

6LQ6

tubes

are

enclosed

shielded

box

containing

powertul

cooling

fan.

The

tube

operation

Class

for

SSB

and

Class

for

grounded-grid

configuration.

The

required

bias

switching

accomplished

means

the

LINEAR

switch.

The

screen

grid

voltage

obtained

from

regulated

power

supply,

thus

assuring

freedom

from

distortion.

addition,

dynamic

balance

circuit

which

maintains

uniform

dynamic

characteristics

among

the

power

tubes,

dual

type

ALC

circuit

for

improved

linearity,

and

SWR

meter

circuit

are

included.

POWER

SUPPLY

SECTION

The

individual

supply

voltages

from

large

power

transformer

having

current

capacity

than

actually

required

are

rectified

rectifier

unit

X43-1010-00.

The

high

voltage

for

the

tube

plates

obtained

from

bridge

rectifier

composed

diodes

(10D

10);

voltage

for

the

screen

grids,

bias

circuit

and

relays

are

supplied

10D4

and

10D1.

OPERATION

PROTECTION

CIRCUIT

109

resistors

R1,

R3,

R5,

R7,

and

are

inserted

into

the

cathode

each

power

tube.

When

current

flows

through

the

cathodes,

the

resistors

develop

voltages,

which

are

fed

the

protection

circuit

through

the

diode

matrix.

Operation

the

protection

circuit,

therefore,

determined

the

cathode

current.

The

protection

circuit

designed

operate

when

cathode

current

240

continues

for

seconds

more,

400

flows

instantaneously

through

power

tube.

240

current

flows

through

the

cathode

one

the

power

tubes,

voltage

(2.4

develops

across

the

cathode

and

applied

the

input

the

protection

circuit

increase

the

potential

across

capacitor

C16

(220uF).

When

this

voltage

increases

1.2

causes

transistor

produce

approximately

0.7

across

the

emitter,

which

turns

the

thyristor

on.

The

thyristor

turn-on

results

actuation

relay

RL1

connected

the

collector

the

transistor.

Relay

RL1

turn

removes

the

supply

from

relay

RL2,

which

then

supplies

high

negative

voltages

the

screen

and

control

grids

the

power

tubes

cut

the

tubes

off.

The

relay,

the

same

time,

lights

the

protection

lamp.

Under

this

condition,

the

antenna

output

automatically

switched

exciter

output.

This

operation

shown

Fig.

When

400

greater

flows

through

tube,

the

thyristor

turned

the

collector

current

transistor

Q2.

The

400

causes

the

tube

develop

across

the

cathode,

and

the

voltage

applied

the

emitter

through

the

diode

matrix.

This

voltage

the

emitter,

however,

the

transistor

adjusted

base

voltage

3.0

the

transistor

develops

CIRCUIT

DESCRIPTION

0.7

across

the

base-emitter

junction

—

the

same

level

produced

the

240

fault

current.

Thus,

the

thyristor

turned

this

voltage

energize

relay

RL1,

and

protect

the

power

tubes.

reset

the

protection

circuit,

shift

the

exciter

stand-by

switch

the

receive

mode

turn

the

LINEAR

switch

off.

This

procedure

necessary

-since

relay

RL2

has

been

self-heid

“make”

contacts

since

operation

relay

RL1,

The

thyristor

however

has

been

automatically

reset.

Fig.

shows

the

operating

characteristics

the

protection

circuit.

Power

Amp.

ANT

Detector

Switching

~~~.

Regulated

70V

Rectifier

X43-1010-00

P.T

Linear

Remote

STBY

FIG.1

BLOCK

DIAGRAM

CIRCUIT

DESCRIPTION

RL1~

contact

RL2

RL2~2

resets

Thyristor

D10

short-circuited

Thyristor,

off

and

cathode

Thyristor,

RL1

Make

contact

operates

RL1

held

exciter

stand-by

switch

RL1~

6LO6

screen

receives

—115V

block

bias

RLi~4

Protect

lamp

lights

6LO6

screen

receives

between

anode

C16

time-constant

circuit

FIG.2

OPERATION

PROTECTION

CIRCUIT

MAX

100

CENTER

1..5

2.5

3.5

——»

Cathode

voltage

(V)

(50

200

250 300

350

400

———>

Power

tube

current

(mA)

FIG.3

PROTECTOR

CHARACTERISTICS

TROUBLE

SHOOTING

CAUSE

AND

CORRECTIVE

ACTION

(a)

Confirm

that

remote

calbe

connected

exciter.

External

stand-by

circuit

inserted

series

with

TL-911

linear-on

switch.

Linear

amplifier,

therefore,

will

not

operate

merely

turning

linear-on

switch

on.

Linear

amplifier

set

transmit

mode

connecting

remote

cable

exciter,

turning

linear-on

switch

on,

and

exciter

stand-by

switch

transmit

mode:

(b)

remote

cable

properly

connected

between

exciter

and

{linear

amplifier?

(Accessory

remote

cable

for

TS-515

TS-510.

For

use

with

other

exciters,

change

connections,

referring

CONNECTIONS

REMOTE

CABLE

page

11.)

Confirm

that

voltage

relay

circuit.

TROUBLE

(1)

Linear

amplifier

does

not

operate

transmit

mode.

(2)

Output

meter

does

not

(a)

SWR

SEN

knob

panel

fully

counterclockwise

position,

deflect.

meter

switch

not

FWD

position.

(SWR

meter

sensitivity

increased

turning

SWR

SEN

knob

the

clockwise

direction.)

(b)

SWR

detection

circuit

inserted

into

coaxial

cable

connecting

relay

RL2

and

antenna

connector.

Confirm

that

the

circuit

rectifying

voltage.

;

Also

check

meter

switch

circuit.

(3)

Overcurrent

protection

circuit

does

not

operate.

(a)

Protection

circuit

turned

off

since

PRO

TIME

knob

Fear

set

the

fully

counterclockwise

direction,

Note:

This

knob

should

not

adjusted

normal

operation.

Power

tubes

may

damaged

transmission

continued

with

protection

circuit

off.

(b)

Confirm

that

the

protection

circuit

powered.

(The

voltage

should

approximately

X53-1000-00.)

(c)

Protection

will

start

only

after

extended

period

plate

current

around

150

mA.

This,

however,

not

trouble

but

due

the

operating

characteristic

the

protection

circuit.

See

Fig.

(a)

Confirm

that

PRO

TIME

knob,

the

rear,

set

proper

operation

time.

(Refer

ALIGNMENT

for

the

time

adjustment.)

(b)

Rated

exciter

input

TL-911

100

driven

than

100

protection

will

trip

quickly

than

rated

due

increase

Ip.

See

Fig.

Protection

will

trip

quickly

transmission

continued

around

300

mA.

This,

however,

reduces

the

life

the

power

tubes,

and

drive

should

reduced.

(c)

linear

amp

tank

circuit

improperly

adjusted,

plate

dissipation

will

greater

under

this

condition.

will

rapidly

increase

with

the

increase

tube

temperature

and

protection

will

trip

quickly.

This

usage,

turn,

imposes

extreme

overload

the

tubes,

causing

them

flash.

The

tank

circuit,

therefore,

should

adjusted

until

tubes

deliver

maximum

output

for

given

rate

plate

current.

(4)

Overcurrent

protection

circuit

trips

too

quickly.

(a)

This

occurs

from

overdirve

which

whistling

instantaneously

swings

400

greater.

Although

instantaneous,

this

large

current

will

rapidly

consume

the

life

power

tube

cathodes

and

microphone

the

SSB

exciter

microphone

gain

should

reduced

avoid

this.

mode

talks

ina

(b)

Variable

resistor

VR6

contained

the

control

unit

set

stronger

voice.

instantaneous

protection

level

below

400

mA.

Readjust

the

potentiometer

referring

ALIGNMENT.

(5)

Protection

circuit

trips

instantaneously

when

operator

whistles

into

the

TROUBLESHOOTING

TROUBLE

CAUSE

AND

CORRECTIVE

ACTION

(6)

Linear

amp

output

cannot

(a)

Meter

switch

not

set

SWR

FWD

position.

tank

circuit

adjusted

FWD

scale

adjusted

with

improper

meter

switch

position,

lp,

plate

dissipation

peak

the

SWR

meter.

will

increase

proportion

meter

deflection

and

quite

dangerous

tubes.

(b)

BAND

switch

not

positioned

the

desired

frequency

band.

There

are

two

band

switches

—

one

the

exciter

and

the

other

linear

amplifier.

With

improperly

set

band

switch,

the

plate

cannot

tuned

and

all

plate

input

wil!

lost

plate

dissipation.

Transmission

should

interrupted

than

seconds

after

protection

circuit

has

tripped,

cool

power

tubes.

(c)

Tank

circuit

not

switched

correct

frequency.

Check

band

switch,

and

tank

coils

and

(d)

Plate

stopping

capacitor

C22

(0.002u/5kV)

not

electrically

connected

plate

choke

coil

and

tank

circuit.

Bias

control

potentiometer

improperly

set.

Readjust

referring

ALIGNMENT.

Note:

Bias

can

also

become

improper

when

line

voltage

not

100

line

voltage

low,

high

and,

high,

low.

(7)

One

two

tubes

drain

much

less

currents

(1p)

than

the

other tubes

the

absence

signal.

Plate

current

varies

little

with

adjustment

dynamic

balance

trimmers.

The

power

tube

defective.

This

trouble

often

occurs

with

flash-damaged

tubes.

Replace

with

new

tubes

and

readjust

bias

contro!

potentiometer

and

trimmer

while

referring

ADJUSTMENT.

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