Kenwood TM-261A - Manual (Page 55)

You сап use almost any computer to control one of the
widely available Terminal Node Controllers (TNC) since the
computer primarily serves to input commands and output
received text data to its display. Little real computing power
is needed, therefore a high-powered processor is not
necessary, and even a “dumb” terminal is satisfactory, at
least to start.
Much reference material is available for getting started in
digital communications from any store that handles
Amateur Radio equipment. Or, if more convenient, check
the radio magazines for mail order bookstores.
• Connect your TNC to the microphone connector on the
transceiver Front Panel using a cable equipped with an 8-pin
modular plug. Wiring details for the microphone connector
are included in “FRONT PANEL” {page 8}.
• Do not share a single power supply between the transceiver
and the TNC.
• Keep as wide a separation as possible between the
transceiver and computer as practical to reduce noise-pickup
by the transceiver.
PACKET OPERATION
у
1200 bps OPERATION
Using a modulator input level that is far different from the
optimum 40 mVp_p specifications may result in deterioration
of S/N ratio or signal distortion. This could result In
increased errors or a complete failure to connect with other
stations.
SattdMe Impedaiiee Stetard f
1200 bps 10 ka 40 mVp-p
Note:
Transmit data input sensitivity is 40 mVp.p. This is suitable for a
typical 1200 bps TNC or other data communications equipment.
The TX deiay parameter on your TNC should be set for 300 ms by
using your computer.
Packet operation, easily affected by transmit and receive conditions,
requires a full-scale S-meter reading for reliable communication.
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