Kenwood TM-V7A instruction manual Data Connector Pin Functions

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E (GND)

DATA connector

Note:

1◆ If the TX delay of your TNC is not long enough, connection errors may occur. If connection errors frequently occur, it is recommended

2to set the TX delay parameter on the TNC to 300 ms by using your computer.

3◆ Using a modulator input level that is far different from the optimum 40 mVP-Por 2 VP-Pspecifications may result in deterioration of the S/N

4ratio or signal distortion. This could result in increased errors or a complete failure to connect with other stations.

5◆ If the modulator input level exceeds approximately 3 VP-Pthe limiter circuit functions to maintain the same transmit bandwidth as that of

63 VP-P.

◆Packet operation, easily affected by transmit and receive conditions,

7requires a full-scale S-meter reading for reliable communication. When the S-meter reads less than maximum during 9600 bps

8operation, communication errors are frequent.

◆Inputting 9600 bps GMSK signals at too high a level or inputting

9significantly distorted signals into the transceiver can cause errors and a wide transmit bandwidth that may interfere with other stations.

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■ DATA Connector Pin Functions

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12	This section describes each pin of the DATA connector
	equipped on this transceiver.

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Pin	Pin	Function
No.	Name
1	PKD	Packet data input
		• TX data from TNC to transceiver
2	DE	Ground for PKD
3	PKS	Packet standby
		• TNC can use this pin to inhibit the
		transceiver microphone input while
		transmitting packet signals.
4	PR9	Output of detected 9600 bps data
		(500 mVP-P, 10 kΩ)
		• Also functions as a common pin for
		1200 bps and 9600 bps data output.
5	PR1	Output of detected 1200 bps data
		(500 mVP-P, 10 kΩ)
6	SQC	Squelch control output
		• Inhibits TNC data transmitting while
		transceiver squelch is open.
		• Prevents interference to voice
		communications on the same
		frequency. Also prevents retries.
		• Output Level
		Open squelch: +5 V (High)
		Closed squelch: 0 V (Low)

Note:

◆If your TNC has a common pin for 1200 bps and 9600 bps data input, connect this pin to the DATA connector PR9 pin. Shorting the PR9 and PR1 pins will cause the TNC to malfunction.

◆When DC voltage is input to the PR1 pin, the TNC may not function. If this problem happens, add a 10 ∝F capacitor between the PR1 pin and the TNC. Be careful about the polarity of the capacitor.