If you want to power your TNC from the radio, you also need SB (switched battery). In the manual, these signals are listed as DI (external modulator input), DEO (detector output), E (earth) and PTT respectively. In order to make high-speed packet work, you need access to the modulator for TX audio, the detector output for RX audio, ground, and of course PTT to transmit.
Kenwood tk 880 repeter manual#
The service manual can be found on repeater-builder, which shows the various boards and the signals on each of the inter-board connectors. However, you can follow those instructions to remove the speaker jack, jumper the proper traces to enable the internal speaker, and route a cable through the resulting hole in the case for interfacing. This one is pretty common, but it actually only describes high-level audio connections, which aren’t suitable for high-speed stuff. This rig is similar to (but much newer than) the oft-used Kenwood TK-805, for which there are documents available about general interfacing. While you could use the well-documented mic and speaker jacks for 1200 baud, 9600 baud and faster require low-level access to the radio’s internals.
Kenwood tk 880 repeter how to#
However, not much is available “out there” on how to interface it to a high-speed TNC. While not frequency-agile or field-programmable, it is more than adequate for a fixed installation, such as a remote base or digital mode transceiver. It is happy in the ham bands, has a good screen, excellent rubber-covered buttons, and is quite small and rugged. The Kenwood TK-840 is a nice commercial UHF radio that is starting to go for $50-$100 on eBay due to the fact that it is not narrow-band capable.
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