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[aprssig] Using SSID's outside 0 to 15

Kai Gunter Brandt kai.brandt at hjemme.no
Thu Mar 4 15:35:23 UTC 2010


Lynn W. Deffenbaugh (Mr) wrote:
> kai.brandt at hjemme.no wrote:
>>
>> If it's only one-way from HF to APRS-IS / V/UHF then it's probably ok.
>> But if you want to send a message to the HF station i think this is 
>> going to be more problematic.
>>   
> 
> APRS messages do NOT use the AX.25 header for the intended recipient.  
> The recipient of the message is in the payload portion which is sent in 
> un-encoded ASCII on all mediums (that I know of).  Any replies or acks 
> (which are really just APRS messages with special text) would be sent 
> from the extended -SSID on HF or APRS-IS and would then (should then) be 
> gated back to VHF as 3rd party packets within which the IGate's call 
> goes in the AX.25 header and the gated source call again goes into the 
> payload which can handle anything.

Yes this is true but i got the impression that the senders callsign was 
xxxxx-AP then the TNC is not going to accept that.

But then it's more clear to me how this application is working.

> Check out aprs101.pdf or just look at a bunch of raw packets on your 
> favorite APRS client (web or otherwise).  Or just send a message to 
> KJ4ERJ-AP (an APRS-IS client) from your RF and see if you get an ack.  
> If I'm around, we could QSO.

I got an ack.

Kai Gunter
LA3QMA



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