[Hackrf-dev] PHASE CHANGE

Ernest Matey ernestmatey310 at gmail.com
Thu Mar 30 06:45:53 EDT 2017


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*
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