Kenwood TM-V7E User Manual download pdf (Page 86)

100

Note:

◆

If the TX delay of your TNC is not long enough, connection errors

may occur. If connection errors frequently occur, it is recommended

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

computer.

◆

Using a modulator input level that is far different from the optimum

40 mV

P-P

or 2 V

P-P

specifications may result in deterioration of the S/N

ratio or signal distortion. This could result in increased errors or a

complete failure to connect with other stations.

◆

If the modulator input level exceeds approximately 3 V

P-P

the limiter

circuit functions to maintain the same transmit bandwidth as that of

P-P

◆

Packet operation, easily affected by transmit and receive conditions,

requires a full-scale S-meter reading for reliable communication.

When the S-meter reads less than maximum during 9600 bps

operation, communication errors are frequent.

◆

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

significantly distorted signals into the transceiver can cause errors

and a wide transmit bandwidth that may interfere with other stations.

■ DATA Connector Pin Functions

This section describes each pin of the DATA connector

equipped on this transceiver.

•

Name

No.

Function

PKD

PKS

PR9

PR1

SQC

Packet data input

TX data from TNC to transceiver

Ground for PKD

Packet standby

TNC can use this pin to inhibit the

transceiver microphone input while

transmitting packet signals.

Output of detected 9600 bps data

(500 mV

P-P

, 10 kΩ)

Also functions as a common pin for

1200 bps and 9600 bps data output.

Output of detected 1200 bps data

(500 mV

P-P

, 10 kΩ)

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.

DATA connector

E (GND)

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Kenwood TM-V7E User Manual Page 86

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