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[Linrad] Sampling and FFT SDR-IQ
- Subject: [Linrad] Sampling and FFT SDR-IQ
- From: "Thomas D. Dean" <speakeasy.org; tomdean@xxxxxxxxxxxxxxxx>
- Date: Fri, 05 Jun 2009 10:00:28 -0700
Hi Leif,
I am still working with linrad and the SDR-IQ and trying to understand
things. Is this is off topic?
In an earlier email, you wrote:
> Now, if you want 4000 to 21000 Hz on a screen that is e.g. 1100 pixels
> wide you would want a bin separation of (21000-4000)/1100 = 15.4545
> Hz/pixel. Linrad can only compute FFT in sizes that are powers of two
> so you would have to use an FFT size of 2048 or more. You may choose
> larger if you like. The sampling rate that you would have to set
> would be:
> FFT size Sampling rate
> 2048 31.65 kHz
> 4096 63.30 kHz
> 8192 126.60 kHz
> I would suggest a sampling speed of about 126 kHz
How do I get from (21000-4000)/1100 = 15.4545 to a sampling rate of 2048
or greater. Is this because in the SDR produces I and Q and I need 2
bins per pixel?
Tom
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