Re: [Discuss-gnuradio] Measuring RSSI values using GRC

[Marcus D. Leech]

> Hello GR list,
>
> I am intending to read RSSI values on a RX (USRP N210),
> I have found in the post of Marcus D. Leech in
> https://www.ruby-forum.com/topic/1857766
>
>
> 10*LOG10(DECIMATE(SINGLE_POLE_IIR_FILTER(COMPLEX_TO_MAG**2(SIGNAL))))
>
> Using GRC, I tried to implement that method of calculation as shown in the
> attached figure,
>
> 1/ Is the flowgraph correct, or is there any missing block (decimation) ?
There are blocks in GRC to do all of that.

> 2/ Then how can I read in human readable format (ASCII) the RSSI values from
> the test_RSSI.txt file sink ?
> 3/ Is there a way to co
Use a "head" block -- you can tell it how many samples to process

> mmand the duration of execution of the flowgraph
> within GRC () ?
> 4/ How can I format the test_RSSI.txt file sink to obtain single RSSI values
> per line ?
The file-sink blocks write out data values in raw-binary format, not 
ASCII text.

You could use a "probe" and poll the probe at 1Hz and have it call a 
Python function of your own to to the ASCII conversions.




> Any explanations are welcome,
> Regards,
> Naceur
>
>
>
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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org