[ARC5] ARC5 Transmitter Calibration xtals

[Geoff]

It is the same as using a signal generator and oscilloscope to test crystal 
activity which Im sure many of us have done.

Carl




> 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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