Saptarshi,
I'm not entirely sure I fully understand what you are doing. You
probably need to provide some more details.
However, in general, depending on what you master-clock-rate is,
doing a 5MHz shift in the DSP does not make much sense if your
sample-rate and your analog bandwidth are only 5 MHz. There is just no
signal at your 5MHz offset you could possibly shift down to base-band.
Cheers,
Julian
On 12/9/20 10:41 AM, Saptarshi Hazra via USRP-users wrote:
Hi,
I am trying to receive on two different centre frequencies (2.475e9 and
2.48e9) using the two receiver chains on B210. Since they are close by,
I thought can receive them by setting the “dsp_freq” parameter.
Case 1:
Subdev: A:A or A:B
Nchannel : 1
Centre Frequency: 2.475e9
Sampling Rate: 5e6
BW: 5e6
If I use the command port the USRP source block to pass a pmt dictionary:
pmt.to_pmt({“lo_freq”:2.475e9, “dsp_freq”: -5e6})
I am able to receive radio packets sent by nodes on 2.48e9 Hz
Case 2:
Subdev: A:A A:B
Nchannel : 2
Sampling Rate: 5e6
Centre Frequency 1: 2.475e9
Centre Frequency 2: 2.475e9
BW: 5e6
I use the pmt dictionary:
pmt.to_pmt({“chan”:0, “lo_freq”:2.475e9, “dsp_freq”: -5e6})
When I do this sometimes I receive data from nodes transmitting on
2.48e9Hz. and sometimes on 2.475Hz. The behaviour becomes entirely random.
I would really appreciate any help in figuring out how to receive
simultaneously on these two centre frequencies.
Thanks,
Saptarshi
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