USRP2 + WBX - Power measurement with different decimation rates

GNU Radio
1

Dear all,
I am using an USRP2 module with a WBX daughterboard.
I am currently interested in power level measurements, and have tried
measuring band power with different decimations.
I’ve noticed, that if I try to measure the same exact band using
different
decimation rates and their appropriate FIR filters, the results differ.
Has anyone else come across this?
Does anyone know why this happens?

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2

On 11/23/2010 07:17 AM, Vladutzzz wrote:

Two things:

Different decimations may use one, two , or no half-band filters in the
decimator. For decimations
that are even and a multiple of 4, two half-bands are used. For
decimations that are simply
even, a single half-band is used, and for odd decimations, no half
bands are used. Odd
decimation is not recommended.

Also, total measured power is proportional to bandwidth.

–
Principal Investigator
Shirleys Bay Radio Astronomy Consortium