I imagine there is a way to use an external GPS referenced10 MHz oscillator
to stabilize a 44.45 MHz Master Oscillator, but I'll bet it would be
expensive! The 10 MHz GPS stabilized part is a no-brainer and the parts are
cheap and available. It's the rest that's a challenge.
The OCXO units I found at
http://www.ecliptek.com/oscillators/EB71F51/#freqstab have stabilities in
the .1 ppm range. Not GPS standard, but pretty good!
Ron N6IE
www.N6IE.com
(Formerly N6AHA)
----- Original Message -----
From: "Grant Youngman" <nq5t@tx.rr.com>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Monday, January 29, 2007 10:49 PM
Subject: Re: [TenTec] Orion/O2 Drift Problem-who is interested in a fix?
often hear Orions on the air, especially on the TT Sunday
net, and very often they are 20 Hz low in frequency. The fan
mod on my website mitigates the problem to some degree, but
it's only a band-aid.
Maybe they're just low because the operators actually believe the 16
digits
of precision they get from their calculators when they divide 1.2 by the
sgrt of 47, and likewise believe the digital dial on their radios is
perfectly accurate to the Hz ???
Or maybe -- they just don't know how to tune to a net. How did ham radio
ever survive in the days of the Handbook VFO :-)
Actually, if T-T released an option to lock the Orions to a GPS-stabilized
10Mhz reference, I'd be the first one in line to buy one. But just
because
someone is using an OCXO doesn't mean they won't still be 20 Hz off --
fixed, stable and permanent :-)
Grant/NQ5T
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