Re: [Discuss-gnuradio] dual coherent channel rtl_sdr

[Marcus D. Leech]

I did a similar experiment with R820T based dongles using an external high 
quality reference and a common signal source. 

The results were poor with a lot of mutual phase noise between two dongles. 

What sample rates did you try and was this E4000 or R820T tuners?

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


On Sep 23, 2013, at 7:59 AM, Juha Vierinen <address@hidden> wrote:

> I was playing around with the rtl_sdr dongles and came up with a trivial hack 
> to build a receiver with multiple coherent channels. I do this basically by 
> unsoldering the quartz clock on the slave units and cable the clock from the 
> master rtl dongle to the slave units (I've attached some pictures). 
> 
> You still have to do sample alignment in software, but this is relatively 
> easy. There are a lot of cool applications, such as a dual frequency beacon 
> satellite receiver, interferometry, or passive radar that you can now do with 
> $16. 
> 
> juha
> <rtl1.jpg>
> <rtl0.jpg>
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