Re: [Discuss-gnuradio] dual coherent channel rtl_sdr

[Marcus D. Leech]

On 09/26/2013 06:32 PM, Heath Hunnicutt wrote:
> Juha,
>
> Ordinarily, I would choose to feed a clock into xtal_in, this seems logical.
> However check out the Elonics patent:
>
> http://www.uspto.gov/web/patents/patog/week49/OG/html/1385-1/US08324978-20121204.html
>
> The main thing to note is that square-wave clock input should be fed to
> xtal_in for the elonics chip.
>
> If you read that patent, it may give you some ideas about feeding a clock to
> xtal_in of other chips.  Maybe other chips will also expect a sawtooth in
> the linear region of voltage swing, not rail-to-rail square wave.  Note the
> comments in that patent on jitter at square wave, etc.,
>
> Nobody on this thread has stated whether they are using e4000 or r820.  That
> would probably be helpful.
>
>
>
>
> --
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Well, my tests have been with R820T, which has a clock output that goes 
to the RTL2832U chip.

I've actually tried both sides of Xtal_I and Xtal_O on the R820T, and it 
makes no difference.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org