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 --------
Date: 7/31/23 18:29 (GMT-08:00)
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 [email protected] AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"