Re: [Discuss-gnuradio] what is the lowest sample rate on USRP2 with WBX?

[Matt Ettus]

On 10/14/2010 09:48 AM, Steve Mcmahon wrote:
> I have a USRP2 board with a WBX daughterboard, which I'm running
> under Linux. What is the minimum sample rate supported? I believe the
> ADC is clocked at the system clock rate of 100 MHz, and the highest
> decimation value is 4096, so does that mean the minimum sample rate
> is 24414 Hz? I would like to sample as low as possible, say in the 50
> KHz to 100 KHz range, to capture some really low frequency (1 KHz to
> 20 KHz) tones. I would really appreciate any help on this problem.
> Thanks a lot.
>
> Steve McMahon


The standard FPGA image has a maximum decimation of 512, not 4096.  That 
will give you a sample rate of 195,312.5 Hz.  You can do any further 
decimation in software using a decimating FIR filter.

Matt