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

[Leslie Smith]

  Hello Robert,

  Measure "it".  Do you mean measure the frequency of the crystal or the
  capacitance of the trimmer?


  I suspect the trimmer has NOT been touched.  Almost certain the
  trimmer has not been touched.


  I have two LM's and two BC-221s.  I had a beautiful BC-221-AK and gave
  it away to a friend, Geoff Linthorne, VK2GL.
  Geoff built a close replica paraset, and he went to a lot of trouble
  to duplicate the original style.  (He even bought 250g of bees-wax to
  coat the tank coil.)  He even spoke with the fellow who designed the
  Paraset.  How's that for an experience!!


I figured he would like a "matching" BC-221 to calibrate his paraset,
and gave him my 'best' one - the AK.
I was shocked recently to discover he gave away my "prize".  HA!  But I
think it went to a collection so I don't mind so much.   Geoff has seen
a lot of interesting things in his life.  He can remember the British
troops returning from Dunkirk.  He was in charge of the deep space radar
unit (at Carnarvon) during the moon landings.  The positioning mechanism
consisted of 360 gold lines engraved on glass, with a optical "mark"
counter.  Very impressive.


Geoff has held an authentic enigma machine in his hands (and threw out
many dozens of the same on orders shortly after the war).  He regrets
being very honest, and not "stealing" one when they were dumped.  Had a
very interesting life, our Geoff.  I'll bet he's one of the few fellows
still alive that trained as a radio-operator/top turret gunner in a
Lancaster.


Geoff lives about ... about 25 km from here.   Very interesting fellow
if you can get him to talk.
  

   73 de Les Smith

   vk2bcu at operamail.com







On Sun, Dec 25, 2016, at 05:45, WA5CAB--- via ARC5 wrote:

> 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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