Re: [Discuss-gnuradio] cheap reference clock using a cell phone

[Dan CaJacob]

Isn't that what Kalibrate does?  http://thre.at/kalibrate/

Very Respectfully,

Dan CaJacob

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On Fri, Apr 5, 2013 at 5:53 PM, Sylvain Munaut <address@hidden> wrote:

Hi,

> 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

Exactly.

> I'm guessing the breadboard is a fractional-N PLL to get it to the frequency
> needed to replace the existing RTL_SDR clock.

Yes. Although it's actually possible to feed the 26 MHz to the E4000
only (and leave the 28.8MHz xtal for the RTL).
This way, no need for PLL.

> Not exactly durable though. Plus you now have an active cellphone next to
> your SDR…

The phone was running a RX only firmware in that picture.


Cheers,

    Sylvain

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