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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] what is the lowest sample rate on USRP2 with WBX? |
Date: | Thu, 14 Oct 2010 09:58:51 -0700 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Lightning/1.0b2pre Thunderbird/3.0.7 |
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
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