On Wednesday 20 March 2002 13:27, Brad Hernlem wrote:
> KKANALZ@prodigy.net sez:
>
> There are at least two series of these crystals; one that has channel
> numbers with three digits and one with two digits. The fundamental
> frequency (in Mc) of the three digit series is simply found by dividing the
> channel number by 720. The two digit series have a fundamental that is
> equal to 20 plus the channel number divided 10, the result divided by 54.
>
> Example:
>
> Channel 273 has operating frequency of 27.3 Mc but fundamental of
> 27.3/72 or 379.166 kc.
>
> Channel 54 has operating frequency of 25.4 Mc but fundamental of
> 25.4/54 or 470.370 kc.
--I have a bunch of FT-241 cased crystals, black, all for 3500 Kc. (Khz for you whipper-snappers). I use them for band-edge markers in my BA rigs. They are just marked "3500 Kc." Actually, I have others that are the same, but for "4600 Kc."
Incidentally, perefct fit in FT-243 socket, no bending of pins or whatever.
-------------------------- John L Sielke W2AGN w2agn@pobox.com http://mywebpages.comcast.net/w2agn Trustee: W3IYQ
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