Computer Interface (Com); Rtty Equipment (Rtty And Acc 2); Linear Amplifier (Remote) - Kenwood TS-870S Instruction Manual

■ Computer Interface (COM)

This connector allows you to directly connect a computer or dumb terminal by using an RS-232C cable terminated
with a female 9-pin connector. No external hardware interface is required between your computer and the
transceiver if your computer has an unused RS-232C serial communications port. See Appendix D on page 83 for
information relating to this connector.
Personal computer/
dumb terminal

■ RTTY Equipment (RTTY and ACC 2)

To operate Frequency Shift Keyed RTTY, connect your RTTY equipment as shown below. Connect the RTTY key
output from your RTTY equipment to RTTY, and connect the demodulation input of your RTTY equipment to
ACC 2, Pin 3. By default, a short condition generates a space; an open generates a mark. However, this can be
reversed via Menu settings.
Do not share a single power supply between the transceiver and the RTTY equipment. Keep as wide a separation
as possible between the transceiver and the RTTY equipment as practical to reduce noise-pickup by the
transceiver.
Personal computer/
dumb terminal

■ Linear Amplifier (REMOTE)

The REMOTE connector allows connection of an external transmit power amplifier. If using an amplifier, confirm
that Menu No. 51 (LINEAR) is set to "1" (Fast) or "2" (Slow) {pages 24, 27}. This Menu item controls the linear
amplifier TX/RX relay response time. Use the Fast setting unless you experience switching problems when using
your amplifier for semi break-in operation.
Note: The TX/RX control method differs depending on external amplifier models. Some amplifiers enter the TX mode when the control
terminal is grounded. For those amplifiers, connect pin 2 of the
the connector to the control terminal of the amplifier.
TS-870S
Black
Red
RS-232C
serial port
MCP
power
supply
Demod
input(RX)
RTTY
MCP
key
output
(TX)
Linear amplifier
AC LINE
RF OUTPUT
Control relay
R
T
2
4 5
1 3
6 7
GND
REMOTE Connector
(Rear Panel view)
TS-870S
TS-870S
ACC 2
connector to the GND terminal of the amplifier and connect pin 4 of
REMOTE
REMOTE connector
Pin
No.
1
Speaker output
2
Common terminal
3 Standby; when grounded, the
transceiver enters TX mode.
4 When connected with the common
terminal, the amplifier enters TX mode.
5 When connected with the common
terminal, the amplifier enters RX mode.
6 ALC input from amplifier
7 Approx. +12 V DC is output when in
TX mode (10 mA max.).
2 INSTALLATION
COM connector
RTTY
Function
5