[ARC5] The not-so humble BC-221/LM-xx frequency meters.

[WA5CAB at cs.com]

If the trimmer appears not to have been touched since it left the factory, 
measure it.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 12/24/2016 08:22:39 AM Central Standard Time, 
vk2bcu at operamail.com writes: 
> The frequency of the 1000kHz crystals were specified to a close
> tolerance.  Now they are 70 years old (at a minimum).  How much have
> they drifted?  If I want to KNOW the REAL long-term drift I must
> calibrate my Fluke frequency count against some primary stanard - and
> I've never done that before.
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