GNU radio RF playback - Reg
Posted: Tue Jun 26, 2018 10:29 am
Hi Team,
I am experimenting with GNU-radio companion and USRP with few exercise. But am not able to get it done precisely.
My setup is Linux Host PC(gnuradio-companion) ---- Ethernet ----> USRP ----> BTS simulator (with Antenna).
Test procedure:
1. BTS simulator is set with the RF freq - 937Mhz.
2. Recording the Time frames from the configured freq using GNUradio companion. (.grc file is attached below).
Center Freq - 937Mhz.
Channel Bandwidth - 200Khz
SAmple rate - 4Ms
Observation:
Gnu radio Freq FFT analyzer doesn't show up the spectrum from the configured center frequency. Instead complete 200Khz bandwidth is having the same signal level (around -60 dbm).
3. I tried playback of recorded RF signal (from freq 937Mhz) which is captured in the point 2. (playback .grc image is attached below).
Observation:
But we observe only noise from the playback using USRP. Noise is more when compared to data. Unable to recreate the recorded RF signals.
Do i need to change GNU Radio companion configuration? or calibrate USRP to get the spectrum for the configured Center freq as expected?
Thanks
I am experimenting with GNU-radio companion and USRP with few exercise. But am not able to get it done precisely.
My setup is Linux Host PC(gnuradio-companion) ---- Ethernet ----> USRP ----> BTS simulator (with Antenna).
Test procedure:
1. BTS simulator is set with the RF freq - 937Mhz.
2. Recording the Time frames from the configured freq using GNUradio companion. (.grc file is attached below).
Center Freq - 937Mhz.
Channel Bandwidth - 200Khz
SAmple rate - 4Ms
Observation:
Gnu radio Freq FFT analyzer doesn't show up the spectrum from the configured center frequency. Instead complete 200Khz bandwidth is having the same signal level (around -60 dbm).
3. I tried playback of recorded RF signal (from freq 937Mhz) which is captured in the point 2. (playback .grc image is attached below).
Observation:
But we observe only noise from the playback using USRP. Noise is more when compared to data. Unable to recreate the recorded RF signals.
Do i need to change GNU Radio companion configuration? or calibrate USRP to get the spectrum for the configured Center freq as expected?
Thanks