USRP2 decimation and effective filter gain

Which decimation ratios on the USRP2 have the same effective filter
gain, or all they all different?


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

On 09/13/2010 12:15 PM, Marcus D. Leech wrote:

Which decimation ratios on the USRP2 have the same effective filter
gain, or all they all different?

The gain is the same on the USRP2 at all decimation rates.

On 09/13/2010 06:19 PM, Matt E. wrote:

The gain is the same on the USRP2 at all decimation rates.

And are the half-band filters used at all decimations, or only some of
them?

Just trying to rationalize some observed behaviour.


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

On 09/13/2010 03:50 PM, Marcus D. Leech wrote:

On 09/13/2010 06:19 PM, Matt E. wrote:

The gain is the same on the USRP2 at all decimation rates.

And are the half-band filters used at all decimations, or only some of them?

Just trying to rationalize some observed behaviour.

One is used when doing even rates, and both are used when doing
multiples of 4. Odd rates don’t have a halfband, and so are not
suggested.

Matt

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