[USRP-users] [Discuss-gnuradio] USRP2 + WBX - Power measurement with different decimation rates

Marcus D. Leech mleech at ripnet.com
Tue Nov 23 15:58:12 EST 2010


On 11/23/2010 03:52 PM, Vlad Stoianovici wrote:
> Dear Marcus,
> Thanks for the reply,
> I used decimation values of 8 and 12 (both multiples of 4), for 
> measuring the bandpower for the exact same band, but different values 
> come out at the end.
> I will try to use a spectrum analyzer as a reference, but so far it 
> seems that for different decimations, the measurement of the same band 
> yields different output values.
> Thanks for your answer.
>
> Vlad
>
That's also to be expected, because the input noise power to the A/D is 
reduced by whatever the decimation ratio is.

Are you using the same bandwidth pre-detection filter for the different 
decimations coming out of the USRP2?



-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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