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HF D-STAR anomaly

Bob KN4HH
BobMember ✭✭
I just installed ThumbDV on my Flex 6500 and am having some difficulties. I followed instructions for installing SmartSDR for D-STAR and the D-STAR waveform. Flex recognizes the ThumbDV, can put it in D-STAR mode and I can decode headers from every station received. However, when I key up the transmitter, the D-STAR waveform appears. As soon as I modulate, the waveform disappears and only a carrier remains. If I unkey the transmitter and rekey, the waveform appears for a few ms and disappears. If I uninstall the waveform, unplug the ThumbDV, plug it back in the Flex, restart SmartSDR, and restart SmartSDR for D-STAR, I can restore the transmit waveform until I modulate and then it disappears. I have yet to decode any voice transmissions (I am aware of the high signal required for successful voice decode). I have done this reset routine many times with always the same result. I have even switched USB ports on the Flex with no difference.
Many thanks for any suggestions
73, Bob, KN4HH
Many thanks for any suggestions
73, Bob, KN4HH
1
Comments
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Hi Bob,
The D-Star demodulation issue has been going on for several months now. It doesn't matter how strong the signal is the D-Star waveform won't decode the audio, but will decode the headers. I believe Flex is aware of the issue. I have been waiting for the fix too.
I also have a UHF transverter connected to the Flex that sits a few feet away listening to a DV-Mega D-Star hotspot. In D-Star mode I hear an occasional burp from the decoder audio then nothing and can decode the headers just fine. I suspect there must be an issue in the D-star waveform. In my opinion this should be an easy fix.0
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