what is happening is when the repeater "talks back" your catching repeater jibber jabber. It happens alot to me here on our local system, not all the time, but 10 % of the time. Evans
_____ From: [email protected] [mailto:[email protected]] On Behalf Of oz1bzj Sent: Monday, December 22, 2008 4:32 PM To: [email protected] Subject: [DSTAR_DIGITAL] Voice out on a data only TX Hi This might in the past have been covered before, but it is Christmas soon so pleas be tolerant if so :-) On the Repaeter system in Central Copenhagen we are on module C running a lot of GPS reporting for mobile stations interfacing to APRS. All of those data packed are "data" only. So triggered by the timer in the radio alone with out interference by human... Now once in a wile when such a data packed are received at any one that might listen on the repeater. There are actual voice coming out other then the Roger beep. Like the Radio are decoding Audio. What come out are indeed garble but never less no audio should be there as we are talking data only. This seems to happen more when the station sending GPS data are marginal on the repeater. We see this more from a ham using a IC92 in his car, then from those using IC2820. Now my guess are that "error" are due to a shift in data as the Voice data are in every packed anyway.So the data packed that original contained no voice, due to noise are altered so the receiving radio believe that there are audio in the packed and start the decoding. Any thought, are that fare out ?? the CRC might have an impact here Thanks in advance 73 de OZ1BZJ [Non-text portions of this message have been removed]
