[aprssig] aprx won't digi from TNC2 interface?

Kenneth Finnegan kennethfinnegan2007 at gmail.com
Tue Aug 23 01:17:08 EDT 2016

On Sun, Aug 21, 2016 at 3:29 PM, Jason KG4WSV <kg4wsv at gmail.com> wrote:
> It's not there in AX.25 binary form but in general there's enough data
> (depending on the specific TNC2 implementation).

I know of no TNC2 format which includes the RR bits, so no, that's not
correct. The RR bits should be preserved across digipeater hops, which is
why Aprx doesn't allow you to route TNC2 packets back to RF.

and write a perl script with ham::aprs::fap which has a function that
> converts tnc2 to kiss

But why not set up a proper KISS receiver and be able to use the existing
software as-is?

The manual says:

> If you absolutely positively must have a TNC2 monitoring mode radio modem,
> then it can
> be used for passive monitoring of heard APRS packets, but beware that such
> radio
> modems usually also corrupt some of heard APRS packets, and that this type
> of interface
> is not available for transmit mode.

I guess I can see how you could read this and not think it was impossible
to use this with a digipeater, but I'd hope you at least came away with the
sense that using TNC2 interfaces is a bad idea.

I just got back from a long weekend working a triathlon, but I've opened
ticket #28 to correct the documentation issue when I'm less tired than
tonight. https://github.com/PhirePhly/aprx/issues/28

Kenneth Finnegan
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