[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.
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?
Shirleys Bay Radio Astronomy Consortium
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