[time-nuts] Small quantity custom crystals
richard at karlquist.com
Thu Sep 30 19:12:30 UTC 2010
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
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