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Re: [Discuss-gnuradio] USRP2+WBX - How to use precisely an 8 MHz band?

From: Nick Foster
Subject: Re: [Discuss-gnuradio] USRP2+WBX - How to use precisely an 8 MHz band?
Date: Thu, 11 Nov 2010 09:51:32 -0800

On Thu, 2010-11-11 at 07:46 -0800, Vladutzzz wrote:
> Dear all,
> I am trying to receive with my USRP2 + WBX daughterboard a signal band of
> precisely 8 MHz in order to measure it's power.
> The problem is that since USRP2 has a 100 MSample/s sampling and I can't
> just devide it by 12.5 to get the desidered 8 MHz band, I need 
> to use an FPGA decimation of 100 together with an interpolation of 8 in
> order to get the desidered results 
> (I am not using decim 25 and interpol 2, because it is said in the
> specification of USRP2 that both parameters have to be at least 4, and
> multiples of 4, in order to get the full band).
> Is this the only way of going about this operation?
> Doesn't this eliminate too much usefull information?
> Please let me know if you would this in a different way!
> Thank you for your time!

I'd sample at 10Msps and use a rational resampler of rate 4/5 to get
8Msps out the other side.


> Vlad.

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