Data Communications - Kenwood TS-790A Instruction Manual

4-10. DATA COMMUNICATIONS (PACKET,
AMTOR, RTTY, SSTV, etc.)
Packet communications will require the use of a ter-
minal unit (available from your dealer).
1. The Accessory 2 terminal has been provided for
connection of Data communications devices. All
necessary connections can be accomplished from
the same connector.
2. When using AFSK (Audio Frequency Shift Keying)
or modulating the signal with any form of audio
tones you should select LSB or USB. If F2 opera-
tion is desired select the FM mode.
3, The transceiver will transmit according to the sig-
nals received on the STBY pin of the connector.
These inputs are generated by the terminal unit in
response to inputs from the associated terminal in-
put device.
4. When using LSB, or USB the MIC gain control
should be used to adjust the input level for an on
scale ALC meter reading.
5, Various forms of data communication like AFSK,
RTTY and PACKET are possible.
Cautions: -
1. Do not transmit key down for a extended periods
since damage to the unit might occur.
2. After continued transmission, allow the system to
cool before retransmitting.
ACC2 pin assignments
Pin number _ Symbol Use
1 SAF SUB receiver audio at a fixed
level independent of AF con-
trol setting. Output voltage:
300 mV/47k2. or more at high
input level
' Connected in parallel with -
ACC 3 pin jack.
MAIN receiver audio at a
fixed level independent of AF
control setting. Output voit-
age: 300 mV/47 kQ or more
at high input level.
Ground of MAF. {Connect
GND of MAIN audio output's
w =
>
cal
|
| 4 GND
|
shield cable).
46
MSQ
GND when MAIN squelch is
open (MAIN BUSY indicator is
' lit). Open when MAIN squelch
, is closed (MAIN BUSY indica-
, tor is out). When connection
i is made to this terminal, you
cannot send packets while
squelch is open, In SSB-CW
mode, reception signal will
disappear and the squelch will
take time to close.
MSM
MAIN S-meter output (parallel.
with device's S-meter). Read-
ing of the internal S-meter
will be incorrect if you ter- '
minate with an impedance of |
less than 10 kQ.
sso.
GND when SUB band squelch
is open (SUB BUSY indicator
is lit}. Open when SUB
squelch is closed (SUB BUSY
indicator is out}. Normatly un-
| used since MAIN channel is
i used for packet communi-
cation.
GND
"Ground of SAF. (Connect
GND of SUB audio output's
shield cable).
PKS
' Standby terminal exclusively
| for terminal units. When this
: terminal ts used, the front
| panel microphone audio input |
will be muted automatically. |
10
SSM
SUB S-meter output (analog
voltage). Reading of the inter- |
nal S-meter will be incorrect
if you terminate with an im-
pedance of less than 50 kQ.
Do not apply external voltage |
to this terminal. :
Transmit audio input terminal 4
(10 mV, 1 kHz) from terminal.
Ground of PKD. (Connect
GND of data signal shield
cable)
ss
PTT terminal. Transmission
| begins when grounded. Use
; Pin 4 or & as chassis GND.