Troubleshooting Inconsistent DVMega Behavior
Posted: Mon Apr 08, 2019 12:19 am
Hello all - does anyone have any tips on troubleshooting/tuning a DVMega board used in a simplex hotpost? I have a brand new DVMega Pi-Hat (from Gigaparts so it should be "genuine"). However the performance of the hotspot is poor at best, especially on D-STAR. It seems to take multiple attempts at transmitting into the hotspot for it to do anything. For example, I can transmit up to five times to CQCQCQ before the system responds. If I try to change commands, for example to send ^^^^^I, I have to repeat the same process. DMR responds quicker in that I usually have to key up only once but sometimes it will fail to respond (tested a lot through Parrot). Once it is responding, I will have arbitrary transmissions mysteriously vanish mid-QSO with no feedback that the transmission failed. I've noted with D-STAR that sometimes I received back the double-quick-beep "error" sound and other times I received nothing back when it's failing to work properly instead of the usual single beep for a successful transmission completion.
I have both the dashboard and a Nextion display up while doing this. Sometimes the incoming RF will not show up in either place, but in most cases the RF is "seen" as received in the Dashboard but nothing will happen. BER is 0.0% for D-STAR and 0.3% for DMR.
I've tried both firmware 3.19 which is what came on the DVMega hat from the factory and 3.26 to see if the referenced D-STAR fixed changed anything and it didn't.
I've also tried 4.0 RC3 to see if that made any difference and it did not.
I also note that pistar-mmdvmcal does not work - claims my radio is unsupported although it successfully identifies it. I've also tried tuning the RXOffset as well as the RX input levels.
I'm out of ideas and looking for some thoughts. Anyone able to assist? Could be a bad board?
I have both the dashboard and a Nextion display up while doing this. Sometimes the incoming RF will not show up in either place, but in most cases the RF is "seen" as received in the Dashboard but nothing will happen. BER is 0.0% for D-STAR and 0.3% for DMR.
I've tried both firmware 3.19 which is what came on the DVMega hat from the factory and 3.26 to see if the referenced D-STAR fixed changed anything and it didn't.
I've also tried 4.0 RC3 to see if that made any difference and it did not.
I also note that pistar-mmdvmcal does not work - claims my radio is unsupported although it successfully identifies it. I've also tried tuning the RXOffset as well as the RX input levels.
I'm out of ideas and looking for some thoughts. Anyone able to assist? Could be a bad board?