Re: [Discuss-gnuradio] Observation concerning decimation with CIC

[Matt Ettus]

I think I know the problem and am working on a fix.  I will let you know 
when I have something to test.

Matt

Christoph Thein wrote:
> Hello,
>
> we have implemented synchronized reception with two USRP2's using a common 
> clock and the 1PPS signal to be able to use the two ethernet interfaces. This 
> works quite good but we observed one thing. 
>
> When we set the decimation rate to an odd number (5 in our case), the samples 
> are aligned perfectly. When we use an even numbered decimation rate, we could 
> detect unalignments in some of our test runs with the same setup.
>
> We have the idea that this is related to the way the decimation is performed 
> (refer to "Re: [Discuss-gnuradio] USRP2 Filtering/Decimation Question" for 
> more details) i.e. if only the CIC is involved it works fine otherwise there 
> are some troubles. 
>
> Does anybody have made similar observations or is able to tell more about the 
> problem?
>
> Thanks,
>
> Hanwen  & Christoph
>
>
>
>
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