Kenwood TH-D7A Connecting With A Personal Computer, Operating Tnc, Command mode, Converse mode

CONNECTING WITH A PERSONAL COMPUTER

You can use an optional PG-4W cable to connect the transceiver with a personal computer. For this cable, contact your authorized KENWOOD dealer.

Note: Turn OFF the transceiver power before making the connection.

OPERATING TNC

This transceiver has a built-in TNC which conforms to the AX.25 protocol. This protocol is used for communications between TNCs. The TNC accepts data from your personal computer and assembles it into packets. It then converts packets to audio tones which the transceiver can transmit. The TNC also takes audio tones from the transceiver, converts them to data for the computer, and checks for errors in the data.

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To PC jack

PG-4W

2.5mm (1/10") 3-conductor plug

RXD2

TXD1 GND3

1To RXD on PC

2To TXD on PC

3To GND on PC

To COM port

DB-9 connector

Pin No. Pin Name

tGND

eTXD

wRXD

The TNC mainly functions in Command or Converse mode. First learn the difference between these two modes.

•	Command mode
	When you select Packet mode, the TNC enters this
	mode. A “cmd:” prompt appears on the computer
	screen. You can type commands from the computer
	keyboard to change the settings on the TNC. When
	in Converse mode, press [Ctrl]+[C] on the keyboard
	to restore the Command mode.
•	Converse mode
	The TNC enters this mode when a linkage with the
	target station is established. On the computer
	keyboard, type an appropriate command and if
	necessary a message, then press [Enter] or
	[Return]. What you type is converted into packets

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Note: When the built-in TNC is ON, some internal frequency relationships may induce an internal heterodyne and cause the squelch to be opened unexpectedly. Shifting the interference will solve this problem. Press [TNC]+ POWER ON to access “BEAT SHIFT”. Press [UP]/ [DWN] to select “UPPER”. Press [OK] to complete the setting. The default is “NORMAL”.

and transmitted over the air. When in Command

mode, type CONVERSE to restore the Converse

mode; you can also type CONV or K instead.

For the commands supported by the built-in TNC, see “TNC COMMANDS LIST” on page 99.

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