BER Bit Error Rate and Hotspot Mode OpenGD77
Posted: Mon Jan 27, 2020 3:28 pm
In speaking with Roger yesterday, he mentioned a detail about the BER being reported to PiStar by the OpenGD77 hotspot mode.
The BER is not an average over the entire conversation, but rather the last BER calculated for the last RF packet handled inbound by OpenGD77. It's the last BER reported by the C6000.
Since Automatic Frequency Control AFC is implemented on the GD77 radio, it compensates for the small few hundred cycle difference between various handheld radios. It's not necessary to use the calibration utility to create RXOffset or TXOffset adjustments with OpenGD77 in HotSpot mode. The exact frequency entered into PiStar is fine.
If you've used the MMDVMCAL utility, you know that instantaneous BER varies a great deal from incoming packet to packet. Just remember that the BER being reported to PiStar is not the average of all voice packets in the conversation, but just reflects the last one.
The BER is not an average over the entire conversation, but rather the last BER calculated for the last RF packet handled inbound by OpenGD77. It's the last BER reported by the C6000.
Since Automatic Frequency Control AFC is implemented on the GD77 radio, it compensates for the small few hundred cycle difference between various handheld radios. It's not necessary to use the calibration utility to create RXOffset or TXOffset adjustments with OpenGD77 in HotSpot mode. The exact frequency entered into PiStar is fine.
If you've used the MMDVMCAL utility, you know that instantaneous BER varies a great deal from incoming packet to packet. Just remember that the BER being reported to PiStar is not the average of all voice packets in the conversation, but just reflects the last one.