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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