Because your flow-graph seems to be confused about sample rates. Part of it thinks you're operating at 32ksps, and you're programming the hardware
As seen above there is different fft plots one after gmsk modulation and one according to uhd_fft.
Reasons?
The block transmitter is in background.
Due to this I am not able to demodulate the data.
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for 1Msps.
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org