CONNECT RADIOS
14
5-Pin DIN Radio Connector (KPC-1 Packet Communicator)
Female (Looking at Holes)
Pins 1, 2, 3 and Audio In must be connected to your radio.
Pin 1 – AFSK Out – white lead
This lines carries the AFSK tones generated by the TNC to the Audio Input (microphone) line of
your transceiver. If your transceiver provides a DC voltage on its microphone input, you must iso-
late this voltage from the TNC. This is normally true for hand-held radios. (See the Interfacing
Hand-Held Radio section.)
Pin 2 – Ground/Shield – black and stranded lead
Connect the push-to-talk ground and AFSK shield to this line. With some transceivers which do not
reference PTT and audio shielding to a common ground, it may be necessary to leave the AFSK
shield (braided wire) disconnected. NOTE: All TNC grounds are common.
Pin 3 – Push-To-Talk – brown lead
This line controls the PTT line in your transceiver, allowing the TNC to switch the transceiver
from/to transmit or receive. Connect directly to the PTT line of the mic-jack connector (See the
section on Interfacing Hand-Held Radios for special notes concerning this pin.)
Audio in
Attach a cable from the external speaker jack of the transceiver to the Audio In jack on the rear
panel of the Packet Communicator. Do not use a headphone or phone patch output from your
transceiver.
External Speaker Jack
This jack can be used to loop the audio through the Packet Communicator. Use a 3.5 mm plug and
shielded audio cable to connect to an external speaker.
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