Recovering the information in a BFSK signal is a software problem on a SDR.
Also, they are typically noisy and use Manchester encoding to recover the clock rate. You should post this on the SDRsharp mailing list - and knowing the transmitting device and a FFT of the resulting signal on the HackRF would be helpful. And did you use a low pass filter - what was the cut off frequency and transition width - and did you avoid the DC offset on the HackRF? And how did you determine it was a FSK and not a PSK signal? The idea is to use the SDR to analyze the I/Q values captured by the HackRFs. -- Cinaed On 03/30/2017 03:45 AM, Ernest Matey wrote: > Experts, > > I have two hackrfs receiving the *same* voice transmission on FSK -1200bps > I expect and plan to see the same modulation signature from the two > systems of this same signal. > I did *Raw* IQ recording with SDRsharp with the following parametrs. > > Tx Freq - 437 MHz > Rx Freq - 437 MHz > Bandwidth - 10 KHz > Samp - 12.5 MHz , 8bit > Black-Harris filter > Freq_correction - -2ppm > > BUT, I do not see the same phase signature of the signal even though I > align the bursts in time. I expect to see same pattern > > *See attached plots of same channel each from the two hackrf systems.* > * > * > *What could be done ? > * > * > * > *Ernest* > > > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
