[time-nuts] Small quantity custom crystals

[Rick Karlquist]

Mark Sims wrote:
>
> I need to build some small tracking transmitters (using a circuit similar
> to  http://www.jbgizmo.com/page4.html  
>
> This circuit uses a fifth overtone crystal to get an output in the 216 to
> 220 MHz range. The circuit is rather finicky about the crystal and
> transistor...  most don't work.   

AFAIK, that is way too high a frequency for 5th overtone.  Has
something changed?  Are you sure there isn't a frequency doubler
after the oscillator?

Anyway, you can get a complete synthesizer on a chip from Analog
Devices that uses very low power (see the ADF4360-8) so you
might want to consider that as an alternative.

Rick Karlquist N6RK