[ARC5] crystal control

[Dennis Monticelli]

I don't recall anyone saying that they were actually planning to do
it, just wondering what the novices were up, what worked, what didn't,
where it was published, etc.

I can vouch for the stability of ARC's VFO.  You do have to give them
a chance to come to temp, but then they really stay put even at 7MHz.
I can also verify that a single bad 1625 can cause a time dependent
freq change.  In my case it caused a bad chirp when there were no
other time dependent factors involved in the circuit path or power
supply.

Dennis AE6C

On 1/27/13, David Stinson <arc5 at ix.netcom.com> wrote:
> All interesting.
> But I don't recommend attempting to crystal-control
> a Command Set.   "Gilding the lily...."
> I use them regularly for contacts on both 75 and 40 meters.
> If properly refurbished, used as-designed and warmed-up
> for a few minutes, they are exceptionally stable.
> If a transmitter wanders much, especially after key-down,
> there's a problem.  I had an ATA 40-meter TX
> that wandered about a KC after key-down.
> That was a mildly gassy (or maybe grid-emitting) 1625.
> Replacement fixed it.  Another on 80 meters had the
> problem of oxidation of the pressed-on connection
> strip on the PA padder cap stator.  Soldering iron
> fixed that one.
>
> 73 DE Dave AB5S
>
>
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