OH2EAT
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Homemade SDR
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EFR32 SDR
RTL-SDR
Some things I've done with RTL-SDRs:
rtl_coherent (link to github)
, tricks to synchronize rtl-sdr dongles
rtl-trx (link to github)
, modulating local oscillator leakage to turn it into a very low power transmitter
Reference clock from 7.68 MHz OCXO:
picture
and
simplified schematic