Keeping it on would fix the problem...but I'm sure it would eventually take
its toll on component life. I ran across a Peltier device while I was
researching this, and very briefly considered pursuing that, but it was a
bit to sophisticated and costly, but a good idea anyway!
Easy enough to retune to the other station's frequency if they are off 20
Hz, but during a net it's kind of a drag tuning up and down all the time :-]
----- Original Message -----
From: "Bill Tippett" <email@example.com>
Sent: Monday, February 20, 2006 6:09 AM
Subject: [TenTec] Orion II Frequency Stability Progress
> >Greater stability can be achieved using more sophisticated
> temperature control, including keeping the area warm even when
> the radio is off, or using a crystal oven
> ...or simply leaving the power on continuously.
> I previously worked at HP where we sometimes used Peltier devices
> for oscillator temperature stability
> in high precision digital voltmeters (A/D techniques
> convert V to F so oscillator stability is important
> for ppm range voltage accuracy). You might be able
> to mount one of these directly to the crystal can.
> >however, for most purposes, this should give the kind of
> stability needed to prevent being 20 Hz high or low on a net
> (I heard several stations off by at least that much on the
> Ten-Tec net today, a couple of them using Orions), which is
> noticeable on SSB.
> ...which begs another question. If you can hear that
> you are off frequency by 20 Hz, why is ppm accuracy even
> necessary in the first place? ;-)
> 73, Bill W4ZV
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