What is the lowest sample rate on USRP2 with WBX?

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

On 10/14/2010 09:48 AM, Steve M. 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

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