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Mobilinkd

with modified egzumer firmware and small hardware mod can cleanly TX 9600 baud GFSK and 4-FSK using TNC4. Image shows GFSK reception via GQRX and . Currently working on the more challenging RX side.

GFSK from TNC4 & UV-K6 received by GQRX and #rtlsdr
UV-K6 and Mobilinkd TNC4 setup for testing GFSK and M17 4-FSK transmission.
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Mobilinkd

Eyes wide open -- Quansheng (AKA ) 9600 baud GFSK reception. Small HW modifications, and egzumer firmware modified for digital modulation/demodulation.

Eye diagram of GFSK baseband reception from Quansheng UV-K6.
Mobilinkd

Surprised at how well the LN4898 audio amp does with low frequencies. Would be better to take baseband from BK4819 directly, but this works for now.

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