Re: [Discuss-gnuradio] Some questions about using UHD

[Vlad Stoianovici]

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
> 
> 

-- 
View this message in context: 
http://old.nabble.com/Some-questions-about-using-UHD-tp31555992p31610402.html
Sent from the GnuRadio mailing list archive at Nabble.com.