Re: [Discuss-gnuradio] Problem with USRP receiver Gain

[CEL]

Dear Prabhat,

the B210 doesn't support 120 dB of gain. 
Ask uhd_uspr_probe about minimum and maximum gain, or simply don't use
"absolute gain" setting in the USRP block, but "relative" gain, and use
0 for minimum, and 1 for maximum gain.

Risking that I repeat what I said before: RSSI is a signal-specific,
not universally defined number that often has a lot to do with rough
guesswork, or, in the case of LTE, it's defined in the standard, but
none of these definitions look like what you do in the flow graph.

If you're computing digital power, just call it power. No need to use a
badly defined term for it.

Also, don't use WX GUI. Use Qt. WX is about to get deleted from GNU
Radio.

Best regards,
Marcus

On Fri, 2018-04-27 at 16:34 +0530, Prabhat Kumar Rai wrote:
> Hello,
> 
> I am receiving RSSI with USRP B210 and I have some doubt regarding that :
> Also, I am attaching grc file and python file for reference.
> 
> 1- I am saving my received data to a file_sink and trying to compute
> power(RSSI) from that by using python code, kindly see attached python
> file.
> At the output, I am getting -20dB if there is no signal source and
> 20dB when there is a signal source (which is not possible).
> 
> 2- Change in gain in USRP_SOURCE block leads to change in the output
> value so I am using maximum as 120 dB. Is that possible or any gain is
> fine?
> 
> Is there any error in python code or in grc file?
> 
> Any help is really appreciated.
> 
> Thanks,
> Prabhat
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