Forum: GNU Radio resampler block not work properly

Hi all,

I desire to set the sampling rate of my receiver on usrp n200 to 
30.72Msps. I have noticed that the sampling rate supported by 
uhd.usrp_source could only be set to integer fractions of default clock 
rate 100MHz. Thus, I used resampler block to  have a try. Unfortunately, 
it did not work to 30.72Msps exactly. It only support 33.33333Msps 
nearest. Does anybody have good ideas on changing sampling rate to 
30.72Msps or somebody have the similar experience ?

Any suggestions would be appreciated.

Chenfei

On Mon, Feb 4, 2013 at 1:27 PM, Chenfei Gao <cgao03@syr.edu> wrote:

> Any suggestions would be appreciated.
>
> Chenfei
>

You kind of have causality backwards. The sample rate begin sent to the
USRP must match the rate at which the USRP is sampling at. Changing it 
in
the host with the resampler not only won't work for what you want it to,
but you will actually distort the signal because of the differences in 
the
rates between the two.

What you want to do is transmit at a larger sampling rate than you need.
When you receive the signal on the other side, you can then resample in 
the
host to get back the exact sample rate you require.

Tom