[Discuss-gnuradio] Some questions about using UHD

[김보미]

 

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