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[aprssig] Xastir Internet->RF configuration

Keith VE7GDH ve7gdh at rac.ca
Mon Apr 6 12:22:24 UTC 2009


Greg  KO6TH wrote...

> I don't think the Tx side is working right. If I tell Xastir to
> "Transmit now", I see the TNC's PTT LED come on, and I hear the usual
> braaap of a packet, but my D7 doesn't display anything. Shouldn't I
> see my Xastir station show up?

Yes, the D7 should be able to see it. What is the transmit delay? If
it's too short, nothing could decode its tones. I find anything over
100 ms is reliable and have even used less, but a bit more would
be more conservative. You could try setting it to a slightly higher
value... or even temporarily to a ridiculously long one for a quick 
test.

>  I also tried sending a message to the D7 (which is configured to
> automatically acknowledge it), but the D7 doesn't do anything. Is this
> an audio quality issue with the TNC, perhaps?  Or, is it sending a
> packet that the D7 ignores?

Do you have another TNC for testing? Does the D7 decode tones from other
stations?

> Also, if I send a position report from the D7, at a low enough power
> that the real digis don't hear it, I see my D7 show up on Xastir's map
> and on aprs.is, as usual.  But I don't hear it repeated back out over
> the air (no PTT, no audio).  Is that expected?   (I do hear it from
> K6FGA-1 when I crank up the power, and get the re-assuring "My
> Position" display on the D7.)

Xastir is hearing and decoding the D7, but is Xastir set up as a digi?

73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"





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