Kenwood TS-790A Instruction Manual page 24

@® ACC 3 jack
The front-panel 144ATT switch can be used to con-
trol an external pre-amplifier for example when switch
SW11 (IF unit X48-3050-XX) is placed to the rear as
shown in the accompanying figure.
Cautions:
1. The 144ATT switch cannot be used to control in-
ternal receiver gain when the ACC3 jack is used.
2. The outer conductor of the jack is grounded.
Front Pee IF-unit | Rear panel
ACC3 jack
144ATT (20VDC, Less than 100mA)
| ie attenuator |
{internal
UF Unit
ACC SW
|
144ATT switch
@ ACC4 connector
This connector can be used to control an Amateur TV
terminal unit.
@©2®
© © ®
® ®
ACC4 View from the rear panel.
24
ACC4 pin assignments
[ i T 2 1
i Pin | |
aumber Symbol Use
1 ALC Output of internal ALC voltage.
2 GND Ground.
3 NC Unused.
4 CNT When 5 to 12 V is applied to this.
| terminal, the transmitter IF signal |
i to the AF unit will be blocked. |
5 | NC Unused. \
6 ' 12TXB Voltage of about 8.8 V is output
during transmission at 1200 MHz,
(maximum permissible output cur-!
my rent 50 mA).
7: CB The DC supply voltage applied to:
| | the power terminal will be avail- |
' able at this terminal via a choke |
| coil and the power switch {maxi- |
mum permissible output current |
100 mA}.
8 ss External push to talk terminal
transmission starts when ground-
| ed (voltage approximately 5 V).
@ EXT CONT connector
Used to control external devices like a linear amplifier.
Use the 7-pin DIN plug provided.
EXT CONT View from the rear panel.