Acc 2 Connector - Kenwood TS-990S In-Depth Manual

08 TERMINAL

ACC 2 Connector

The input and output of an external device can be connected to the ACC 2 connector.
The ACC 2 connector has a 13‑pin accessory terminal and its pin assignment is intended to match those of transceivers
that have a main band and a sub band, such as the TS‑2000S, TS‑950, and TS‑790. Pin 2 is reserved for RTTY keying.
● RTTY Keying Input
In FSK mode, like conventional models, the TS‑990S allows a RTTY terminal device and a PC as well as an internal
demodulator to enter keying signals to the pin.
The logic is such that transmission starts with the displayed frequency by shorting the circuit to ground and frequency
that is shifted by 170 Hz by opening the circuit (FSK shift width: 170 Hz, FSK key polarity reverse: Off).
Pin Pin
No. Name
1 SANO
2 RTTY
3 MANO
4 GND
5 MSQ
6 MMET
7 SSQ
8 GND
88
e
Fig. 137 ACC 2 Connector
Table 13 ACC 2 Connector Pin Assignment
Sub band audio output
• Connect this pin to the audio input of an external device (TNC, MCP, PC).
• The audio output level is not associated with the AF knob (sound volume).
• The audio output level can be changed in Menu 7‑11. With the audio output level set to
"0", the audio signal output is 0 Vp‑p. With the default value of "50", it is 0.5 Vp‑p, and
with the audio output level set to "100", it is 1 Vp‑p. (Output impedance: 10 kΩ)
RTTY (FSK) keying pin
• The keying polarity can be changed in Menu 2‑07.
Main band audio output
• Connect this pin to the audio input of an external device (TNC, MCP, PC).
• The audio output level is not associated with the AF knob (sound volume).
• The audio output level can be changed in Menu 7‑10. With the audio output level set to
"0", the audio signal output is 0 Vp‑p. With the default value "50", it is 0.5 Vp‑p, and with
the audio output level set to "100", it is 1 Vp‑p. (Output impedance: 10 kΩ)
Signal ground
Main band squelch control output
• Connect this pin to the squelch input of a TNC/MCP/PC connection interface.
• While the squelch is open: Low impedance
• While the squelch is closed: High impedance
Main band meter level signal output
Sub band squelch control output
Signal ground
m
j
k
i l
f g
h
a d
b c
Function
I/O
O
I
O
—
O
O
—
—