Kenwood TS-870S Computer Interface COM, RTTY Equipment RTTY and ACC, Linear Amplifier REMOTE

2 INSTALLATION

■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.

RS-232C serial port

	TS-870S
Personal computer/	COM connector
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.

MCP

power supply

Demod input(RX)

	MCP	RTTY	TS-870S
		key	ACC 2	RTTY
Personal computer/
		output
dumb terminal
		(TX)

■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 Ò1Ó (Fast) or Ò2Ó (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 REMOTE connector to the GND terminal of the amplifier and connect pin 4 of the connector to the control terminal of the amplifier.

TS-870S	Linear amplifier			REMOTE connector
			Pin	Function
			No.
			1	Speaker output
	Black		2	Common terminal
	Red		3	Standby; when grounded, the
		AC LINE
				transceiver enters TX mode.
	RF OUTPUT		4 When connected with the common
	Control relay			terminal, the amplifier enters TX mode.
	R		5 When connected with the common
	T
		2		terminal, the amplifier enters RX mode.
	4	5
	1	3	6 ALC input from amplifier
	6	7
	GND		7	Approx. +12 V DC is output when in
	REMOTE Connector			TX mode (10 mA max.).
	(Rear Panel view)

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