Neat idea! Presumably he just tapped the (buffered?) output of the VCTCXO on the phone which has is being actively steered by the phones operation, and I'm guessing the breadboard is a fractional-N PLL to get it to the frequency needed to replace the existing RTL_SDR clock. Not exactly durable though. Plus you now have an active cellphone next to your SDR…
On Apr 5, 2013, at 12:12 PM, Juha Vierinen <[email protected]> wrote: > I found something interesting on the internet today, while browsing for > rtl_sdr related information. It seems like a guy called steve-m has fed his > rtl_sdr dongle a clock from his mobile phone. Here is a picture: > > http://steve-m.de/pictures/rtlsdr_external_clock.jpg > > Now mobile phone networks can be used to estimate the frequency error of your > oscillator, because base stations will have clocks that are in sync to a > global reference. I think this is what steve-m is aiming for. Has anyone else > attempted to do this? I'd be interested to hear about your experiences. > > It would be neat if a $8 dongle and a $20 cell phone could be combined to > create a SDR locked to a global reference. > > juha > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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