Receiver is not decoding FT8 traffic

conr2286 / PocketFT8Xcvr

Yet Another Pocket FT8 Transceiver

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Receiver is not decoding FT8 traffic #22

Closed conr2286 closed 1 day ago

conr2286 commented 2 days ago

Decoded FT8 traffic is not displayed. The waterfall graph seems truncated with only the leftmost side displayed.

Patching the received audio from the SI4735 into an amplified speaker plays FT8-sounding traffic.
Playing a raw recording of the captured 16-bit single channel audio at 32000 samples/sec also sounds like FT8.

Timing problem??? GPS has not yet been implemented.

conr2286 commented 1 day ago

The ADC was running at the wrong sample rate. Pocket FT8 requires a 6400 samples/second rate and this is implemented for Teensy 4.1 by modifying the definition of AUDIO_SAMPLE_RATE_EXACT in AudioStream.h to be #define AUDIO_SAMPLE_RATE_EXACT 6400.0f

With this fix in place, the Pocket FT8 Transceiver is now decoding and displaying some FT8 traffic, although it seems painfully sparse to me.