[ARC5] move an FT-243

[Geoff]

I ground a few and then went to etching in the 50's but just enough to get 
away from the surplus frequencies everybody was parked on. The HF was 
available in the HS Chem lab and the Christian Brother in charge got the OK 
from the ham club Brother who was the Physics instructor. Got my General, 
got a VFO, and havent used crystals for transmitting on HF since. Did use 
them another 10-12 years to get on 6 and 2M and etched several more to get 
clear frequencies as everybody was  using WW2 surplus 8mc rocks there. Didnt 
take much work when the multiplication was 6 and 18.

Carl



----- Original Message ----- 
From: <wb3fau55 at neo.rr.com>
To: "Dennis Monticelli" <dennis.monticelli at gmail.com>; "Bruce Long" 
<coolbrucelong at yahoo.com>
Cc: <arc5 at mailman.qth.net>; "Robert Eleazer" <releazer at earthlink.net>
Sent: Friday, March 15, 2013 6:31 PM
Subject: [ARC5] move an FT-243


> anyone  ever hand grind a xtal up 115kc?  I actually moved up a 7185 xtal 
> to
> 7290kc.  Most people  told me,   you cannot do it.  I used wet and dry 
> sandpaper,
> as for cleaning,  handsoap and water...Russ.
> ---- Dennis Monticelli <dennis.monticelli at gmail.com> wrote:
>> Hello Bruce,
>>
>> It's great to meet someone that was right in the middle of that amazing
>> effort to literally create a broad crystal manufacturing effort 
>> overnight.
>>
>> Yes, the pressure on the blank, the exact placement of the pressure, the
>> air gaps, etc all matter.  The small mass of the plated contacts on 
>> modern
>> crystals are used to fine tune the frequency and these regions can 
>> display
>> aging characteristics too.  The well-etched defect-free crystal mand-made
>> quartz blank all by itself is extremely stable with time.  It only needs
>> temp correction and/or temp stabilization.
>>
>> Perhaps you could share more stories with us about those crystals in our
>> past.
>>
>> Dennis AE6C
>>
>> On Fri, Mar 15, 2013 at 9:47 AM, Bruce Long <coolbrucelong at yahoo.com> 
>> wrote:
>>
>> > Sorry Kennth for sending this email originally just to you instead of 
>> > the
>> > group   bruce
>> >
>> >
>> >
>> > with respect to HF  I discovered to my surprise some small bottle rust
>> > removing potions available at the big orange box are actually dilute HF
>> > solutions.  They work really well for me.
>> >
>> > I am also very happy to
>> >  see this discussion of the important of WW2 quartz crystal technology-
>> > having been previously employed at Piezo Crystal Company, McCoy
>> > electronics and Bliely- the latter as a consultant.
>> >
>> > The huge
>> > expansion of the quartz crystal industry in the USA was in my opinion a
>> > very important aspect of the American war effort and is not widely
>> > understood or recognized.  IIRC the war time expansion when from fewer
>> > than 10 very small pre-war crystal companies that catered to the 
>> > amateur
>> >  and custom experimental market to well over 300 companies at the peak
>> > manufacturing what was at the time an extremely high tech,
>> >  precision product.
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