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Re: [Discuss-gnuradio] Problem with N200 and waterfall display in grc

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Problem with N200 and waterfall display in grc
Date: Tue, 16 Aug 2011 15:27:24 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0

On 16/08/2011 3:20 PM, Isaac Gerg wrote:
I fixed it by ensuring that the sample rates were correct in the blocks. I was requesting a fs of 100 Hz but was getting something around 190kHz. Once i got these numbers all synced up (to the 190kHz) the blocks worked as expected.

The Fs on the FFT and Waterfall graphs is used to calculate the labels for the X-axis, and also some internal decimation, but it doesn't force the incoming stream to be arriving at that sample rate. It must match the actual sample rate, which on the N2XXX is a minimum of
  100e6/512 = 195312 Sps.

If you need to process samples at some rate other than one of the properly-decimated rates coming out of a UHD source block, you'll have to resample within the flow-graph. I like to use the fractional interpolator myself.

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