Kenwood TS 790 A Owners Manual

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Thank you for purchasmg this new transceiver.

IMPORTANT: h_a-_
Please read this Instruction Manual carefully before
placing the transceiver in service.

SAVE THIS INSTRUCTION MANUAL.

The following explicit definitions apply In this manual:
Note : If disregarded, inconvenience only, no risk
of equipment damage or personal injury.

This Instruction Manual covers the following I
models:
TS~790A;AII Mode Tribander *
iU.S.A. and general markets) I
TS-790E: All Mode Tribander '
(U.K. and European markets)
Illustrations show the TS~790A.

CONTENTS

Caution : Equipment damage may occur, but not
personal injury.
1. BEFORE OPERATION .................................... 3

2. SPECIFICATIONS AND ACCESSORIES. 4
2-1. SPECIFICATIONS .......... 4
2-2. ACCESSORIES .............. .5

3. INSTALLATION AND CONNECTION...............6

6
6
8
8

3-1. INSTALLATION .............
3-2. CONNECTION.
4. OPERATION ..........
4- 1. OPERATING CONTROLS
4-2. RECEIVER OPERATION...
4-3. TRANSMITTER OFERATION.. .
4-4. MEMORY.. ..34
4-5. SCAN
4-6. REPEATER OPERATION .....
4-7. TONE SOUELCH ICTCSS)..
4-8. TRACE FUNCTION ............
4-9. SATELLITE COMMUNICATIONS.

4-10. DATA COMMUNICATIONS ................... 46
4-11. OPERATION WITH A PERSONAL
COMPUTER ..................................... 47
4-12. VOICE SYNTHESIZER.. ................ 48
4-13. IZOOMHz IF CONNECTOR AND ACC4
CONNECTOR ...................................... 48

5. BLOCK DIAGRAM AND CIRCUIT DIAGRAM..49
S-I. BLOCK DIAGRAM ...............
5-2. CIRCUIT DIAGRAM .............

6. MAINTENANCE AND ADJUSTMENTS ..
6-1. GENERAL INFORMATION .
6-2. SERVICE .......
6-3. CLEANING .....
6-4. IN CASE OF DIFFICULTY..
6- 5. ORDERING SPARE PARTS
6- 6. ADJUSTMENTS ...........

7. OPTIONAL ACCESSORIES ............
7- 1. VS- 2 VOICE SYNTHESIZER

INSTALLATION ..................

7-2. TSU-S PROGRAMMABLE TONE
DECODER UNIT INSTALLATION ............ 66
7-3. UT-lO IZOOMHZ UNIT INSTALLATION ..67
7-4. OTHER ACCESSORIES ..
8. REFERENCE ........................

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RlT control

When the transmit frequency of the distant station
drifts a little bit during the 050, but you do not wish
to alter your transmit frequency to compensate, you
may wish to make use of the RIT control function. This
control allows shifting the receive frequency without
shifting the transmit frequency. The RIT control allows
you to shift the receiver frequency This control is also
useful for pileups when the UK station is transmitting

a little above or below his receive frequency.

Notes: ,

1. The RIT offset is displayed on the main display. You
can therefore preset the offset before you actually
need to use It. When you move to another statlon
make sure you turn OFF the RIT switch.

2. The figure below illustrates that the RIT display and
the VFO display may not agree exactly in all in-
stances since the FIIT and VFO tune in 20 Hz steps.
The main display resolution is 100 Hz, and would
not Show a change of 20 Hz. You would need to
change the frequency at least 100 Hz to see an ac-
tual change in this display. (Except FM mode.)

HIT

@ IF SHIFT control

The IF SHIFT control allows you to shift the IF pass-
band of the receiver, without changing the actual
center frequency of the receiver. This control is use-
ful when there is interference near your center fre»
quency.

Interference from lower frequencies can be reduced
or eliminated by rotating the IF SHIFT control in the
6») direction. This will cause the resulting audio fre-
quencies to have a slightly treble response, i 9. low
cut filter (low frequencies attenuated). Interference
from higher frequencies can be reduced or eliminated
by rotating the IF SHIFT control in the 9 direction.
This will cause the resulting audio frequencies to
sound a little bassy, i.e. high cut filter (high frequcna
cies attenuated).

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4-5~3. Memory Channel Lockout

This transceiver has a Memory Channel lockout func-
tion which allows you to temporarily skip unwanted
Memory Channels during memory scan. Locking out
unwanted channels will help to increase the effective
scan speed.

1. Press the VFO/M key to enter the Memory Chan-
nel mode.

2. Select the Memory Channel that you want to skip
using the TUNING knob.

3. Press the CLEAR key.

4. A decimal point will appear in the M.CH display to
indicate that the channel will be skipped.

5. To cancel the lockout, select the desired channel
and then press the CLEAR key. The decimal point
will go out indicating that the channel will again be
scanned.

Note: 7 I, 77 .

Holding the CLEAR key depressed for longer than 2

seconds will 'clear that channel.

4-5-4. Scan Hold

Time operate scanning is selected initially (i.e., scan-
ning stops (for about 5 seconds] when the BUSY in-
dicator lights). You can switch to carrier-operated
scanning (scanning stops when signal is received) by
pressmg the TOICO key during scan.

To resume scan, rotate the TUNING knob or press the
microphone UP/DOWN switch.

4-5-5. Priority Alert
When the ALERT function is active the transceiver will
monitor the alert channel every 5 seconds and beep
if the channel is busy (4-4-5. D. Alert channel].
1.To start the alert function, press the F key then the
CALL key. (With the TS 790A).
Press the ALERT key. (With the TS»790E)
The MAIN display will read "AL".
Cautions: 7* I #
1. The alert function does not work when SUB is
selected.
2.The frequency memorized in the call channel
memory will be moved automatically to the alert
channel memory it you initiate the alert function
when no data has been stored in the alert chan-
nel memory.

2. Set the MAIN SOL control at the point where the
noise just disappears.

3. To release the function, press the F key then the
CALL key again. (With the TS 790A)
Press the ALERT key again. (With the TS-790E)

If you press the F-and~CALL key (With the TS»790A),
F-and»ALEFlT key (With the TS-790El when the alert
function is on, you will transter to the alert channel
immediately.

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