Kenwood TL 922 Owners Manual

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LINEAR AMPLIFIE

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AFTER UNPACKING

It is advisable to save all original packing cartons (inner and
outer) to prevent 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 manualc Be
sure to read these definitions:

NOTE = 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-922 SPECIFICATIONS ................... 3
SECTION 1 FEATURES ................... 4
SECTION 2 PREPARATION FOR USE ......... 5

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 .................. 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-922
SECTION 5 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 SuppressSFm 1

an:

CAUTION

Read Operating Manual Section 2 before proceeding to
unpack and assemble your amplifier.

WARNING
LETHAL VOLTAGES PRESENT.

NOTE

This manual covers both the 240/120V and 220/240
versions of the TL-922. Please disregard those sections not
pertaining to your model.

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 ...... 16
INTERNAL PART LOCATIONS .............. 1B
SCHEMATIC DIAGRAM .................... 19-
ILLUSTRATIONS
Fig. I Upper Case Cover Assembly/Disassembly. . 5
Fig. 2 Correct Power Tube Handling ........ 5
Fig. 3 Parasitic Suppressor Coil Mounting ...... 6
Fig. 4 Input Voltage Terminal Boards ........ 7
Fig. 5 Input Voltage Terminal Boards ........ 7
Fig. 6 Power Cable Color Code ............ 8
Fig. 7 Exciter Connections for RL and ALC
Controls ....... '. ................ 8
Fig. 8 Interconnection of the TL-922 ........ 8
Fig. 9 Linear Power Amplifier Circuit ........ 13
Fig. 10 Transformer Primary Current Flow . , . . 14
Fig. 11 Fan Motor Delay Stop Circuit ........ 14
Fig. 12 Meter Drive Circuit ................ 14
Fig. 13 Packing for Shipment .............. 17
VIEWS
Front View ........................... 9
Rear View ............................ 10
TABLES
I. Front Panel Controls Set-Up .............. 11'

2. Tune and Load Initial Settings ............ Il'

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SECTION 4. OPERATION

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4.1 PRECHECKS

If you are a newcomer to this type of equipment, or if you
have replaced a power tube, you should first assure yourself
of the following before connection of power and turn on:
a. Power tubes are installed correctly.

Verify tube installation'checkout with Section 2.2.

b. The upper case cover and inside shield plate are cor-
rectly installed per Section 2.2.
The upper case cover controls the high voltage
primary protection circuit. This circuit also controls
the fan motor power. The inside shield plate controls
the high voltage protection circiiit, grounding the HV
supply, which will immediately blow the power fuses
if incorrectly installed. Particular care should be ex-
ercised when installing the inside shield plate. In addi»
tion, the upper case cover and inside shield plate are
needed for heatvsinking the interior of your TL-922.
For installation of these plates, please refer to Section
2.2, How To Install Power Tubes."

c. Line voltage change terminals are properly bridged for
your local Lina voltage.
Refer to Section 25 Line Voltage Change."

d. Make certain that the exciterl antenna and ground
wires are connected properly Verify that the POWER
switch on your TL- 922 is in the OFF position BE-
FORE CONNECTING the AC power cable

e. Set the front panel controls of your TL~922 as fol-
lows:

TABLE 1 - Front Panel Controls Set-Up

Control Position To:

LINEAR STBY

METER HV

MODE CW

PLATE Center of hand used

LOAD Fully counter-clockwise "0"
BAND Exciter frequency

CAUTION: Be sure to set the BAND switch to the same
band as that of the exciter before operation is
attempted.

Now you may turn the POWER switch "ON". Make certain
that the fan motor is revolving. The Multimeter will read
approximately 2 kV on the HV scale. If you turn the
MODE switch to the SSS position and the meter will read
approximately 3 kV.

Turn the LlNEAR switch to the OPERATE position. The
exciter now controls the TL-922 for automatic transmit/
receive operation. In the CW transmit mode, In (plate cur-
rent) in the no signal state should be approximately 100
mA;1'n the SSS transmit mode, no signal state_ should be
approximately 200 mA. . -

4.2 CW OPERATION

CAUTION. Tune- -up should be accomplished Cluiiklv I
power tube life will be shortened. M; . =
key»down: 10 minutes.

1. Adjust the exciter for maximum output.

2. Set the MODE switch to the CW position v' ill

meter to RF.

3. Adjust the carrier control on the excite!

level.

4. Set the LINEAR switch on your TL 92."

OPERATE position.

5. Increase the carrier control on the (excite: '

ficient drive to adjust the tuning.
Quickly switch to lo and dip the plate.
Switch to RF and adjust loading for H... -.
8. Increase exciter to maximum ooweriabout IL. .
Repeat steps 6 and 7 several times for 11 .
RF output, If the In exceeds 650 mA, Ice. _, .
input from the exciter by turning the AU.
control on the rear panel. Refer to Sewn
"Setting the ALC".

9. Make certain that the lg (grid current) is heluw W
mA. If not, adjust the ALC ADJ control to red-rm
the RF input level.

N93

c 'UTION: Never change the BAND switch whiii- .a: ..
'1 mitting.

f

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TABLE 2 Tune and load initial setting

' 100W input 50h output loading.

Band Freq. initial load setting
(MHz) CW 388 I

60 E [5_ 5 3.5 l
30 [4 3.5 [2 [is _.. E
40 [3° , [3.5 3 l
[12:35 t
15 [31:35 [3 213 i
w [33:3 [2 E 2 I

'E -.-_

4.3 $88 OPE RATION

Tune-up as in CW operation. Reduce the carrier Control or
_the.exciter to minimum and change mode swucv a: ;

Increase the carrier control on the exciter and tune in:
maximum output-The lp (plate current) and lgigrid culreri:
at maximum _ put are naturally greater than the; 6! CL
operation; I