[ARC5] ARC5 Transmitter Calibration xtals

[AKLDGUY .]

Rick, you are correct in almost every point but you are clearly wrong in
this:

"The octile based xtals were used with the 1629 magic eye tube to check the
VFO freq *by beating it against the xtal oscillator *using the eye tube as
a null indicator."

There was no xtal oscillator. The crystal was simply used as a highly
selective filter to give a very sharp indication in the magic eye tube as
the VFO was tuned across the crystal frequency.

73 de Neil ZL1ANM


On Sun, Aug 17, 2014 at 7:34 AM, Rick Nasti <ricknasti at icloud.com> wrote:

> The ARC5 transmitters all used a built-in VFO to set the transmitting freq.
> The octile based xtals were used with the 1629 magic eye tube to check the
> VFO freq by beating it against the xtal oscillator using the eye tube as a
> null indicator.
> That's what the little mirror on the inside of the tube cover door was for.
> Each transmitter used a different cal freq, which I think was near the
> center of the bandwith of the VFO.
>
> I always thought it was a clever and somewhat elegant solution to the
> problem of keeping everyone on the same freq.
>
> All of the above is based on 40 year old memories, but I believe it should
> be reasonably accurate.
>
> 73,
> Rick
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