[ARC5] Odd Freq FT-243 you looking for

[Tim]

When I was digging into the history of the RS-1 and GRC-109 sets crystals
naturally came up.  In the CIA's online "Reading Room" of declassified
rabbit holes I found a document that stated that the CIA held over 12
million crystals in inventory in the early 1960's.  (Sorry, I did not write
down the Doc number but it's there...)  I wonder what happened to all of
those.

I do remember seeing a 55 gallon drum full of FT-243 crystals at one store
on New York's Radio Row in the mid 1960s.  25 cents a piece, I bought a
bunch; any useful "ham freqs" were about a foot below the surface...  And I
learned that QSY-ing crystals was a skill I did not have...hihi
Tim
N6CC

On Mon, Jul 31, 2023 at 8:00 PM Ken <kgordon2006 at frontier.com> wrote:

> I have purposely bought as many FT-243  crystals as I could in any
> frequency below the 40 meter band, then I etch them to a chosen frequency
> with Whink Rust Remover. It is slow, but works well. I am slowly
> accumulating 40 meter crystals beginning at 7000 kHz every 5 kHz to the top
> of the band.
>
> 80 meter crystals are hard to find and 160 meter rocks are just plain
> scarce to non-existent. 60 meter crystals might be a bit easier.
>
> One can also get artist's glass etcher at hobby stores. Both contain
> hydro-flouric acid, which is dangerous stuff even at low strength.
>
> Ken W7EKB
>
>
>
> Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
>
>
> -------- Original message --------
> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> Date: 7/31/23 18:29 (GMT-08:00)
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] Odd Freq FT-243 you looking for
>
> Are the frequencies on the crystals channel or crystal frequency?
> If channel frequency and receive crystal, the crystal frequency could be a
> by offset by an if frequency and a multiple of the crystal frequency.
>
> Glenn
> WB4UIV
>
> On 7/31/2023 3:12 PM, Paul Thekan wrote:
>
> Thanks again to all that responded to my post yesterday for info on
> crystal mfr's during the war.
>  As I slowly go througj the pile of xtals here...I'll be happy to keep a
> look out for any non ham band freqs you may want. So far out of 350 xtals
> looked at , only two 40 mtr xtals were found.
> So far the highest freg found is around 8mcs. The bulk so far is around 5
> -6.9 mcs and others in the 4mc range.
>
> Also have quite a few DC 34 xtals as used on the BC669 , these all in the
> 4 mc range.
>
> Let me know what you your looking for.
>
> Paul
> N6FEG
>
>
>
>
>
>
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> --
> -----------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
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> of the Amateur that holds the license"
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