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Re: [Discuss-gnuradio] Some questions about using UHD
From: |
Vlad Stoianovici |
Subject: |
Re: [Discuss-gnuradio] Some questions about using UHD |
Date: |
Fri, 13 May 2011 04:04:12 -0700 (PDT) |
Hi Bomi!
Don't know if you still need this but there is a block in GRC called
Rational Resampler, try using that combined with the USRP2's decimation (for
example Decimation 4 and Rational Resample rate of 8/25 for a 8M band) for
trimming your baseband!
HTH.
Vlad.
Bomi wrote:
>
>
>
> Hello :)
>
> I am trying to implement the relay system with USRP2 & RFX 2400.
>
>
>
> I am using GRC+UHD.
>
> (GNUradio 3.3.0 , UHD_003.20110310224233.4c7cc6b)
>
>
>
> When UHD is used in some cases, the comments come up as below.
>
> (1) Target recv sock buff size: 50000000 bytes
> Actual recv sock buff size: 131071 bytes
>
>
> (2) Target sample rate: 8.000000 MSps
> Actual sample rate: 8.333333 MSps
>
> (2) may be caused because interpolation or decimation rate must be
> integer.
>
> So if the sample rate that I intended is 8.000000 MSps at TX, the
> interpolation rate(100M/8M=12.5) is not integer. Thus the actual sample
> rate is different from the target sample rate. Is my guess right?
>
>
>
> But I don’t know well about (1).
>
>
>
> What does that mean?
>
> Where is “the recv sock buff”?
>
>
>
> Finally, I am curious about the UART of USRP2.
>
> How does the UART operate in USRP2?
>
>
>
> Thank you for your valuable time.
>
>
>
> Regards, Bomi
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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