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IF Freq for SDR sampling

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July 1st 07, 08:37 PM posted to rec.radio.amateur.homebrew,comp.dsp

Eric Jacobsen Eric Jacobsen is offline

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IF Freq for SDR sampling

On Sun, 01 Jul 2007 11:18:12 -0700, wrote:

On Jul 1, 6:44 am, MarkAren wrote:
The BF537 EZ-KIT Lite + AD7763 for less than US$180 looks like a
brilliant deal to me, but won't you need I as well as Q channel ADCs ?

The intent would be to implement a digital downconverter in the DSP.
That of course begs the question of how much horsepower is necessary
to implement a DDC? I know people are doing it using FPGA, however
I haven't seen anyone doing it using a DSP.

Another option would be to insert a AD6620 which is a digital down
converter.

-- John

If the sample rate is low enough there's no reason the DDC can't be
done in software. Since your signal is narrow that might be possible
if you can sort out the IF issues and the IF filter bw.
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.ericjacobsen.org

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