"KE9EX" wrote in message
oups.com...
I read here or somewhere about how to translate the numbers stamped on
a FT-243 Crystal
to be able to tell the Crystal's Frequency. I have some with these
numbers stamped on them,
and want to be certain of the frequency, since the ink with the exact
Frequency has long since faded. TNX ex 73, Mike


If you don't get an answer--the FT-243 rocks are fundamental cuts. It
would be easy to build an untuned Colpitts oscillator, and use a counter
to determine the crystal frequency. A simple c-mos IC oscillator would
probably also work.

Pete

ANOTHER WAY IS TO USE AN MFJ ANTENNA ANALYZER - JUST USE ALLIGATOR CLIPS TO
HOOK THE XTALS PINS TO THE SO-239 ON THE ANALYZER -

TUNE ACCROSS - THE RESONANT FREQ WILL SHOW AS A 1:1 ON THE ANALYZER METER -
JUST READ THE FREQ OFF THE LCD.

- or -

USE ANY XTAL TRANSMITTER BY PULLING OUT THE BUFFER/DRIVER TUBE AND TAKING A
FREQ COUNTER OR SW RECEIVER NEAR THE OSCILLATOR TUBE AND KEY THE
TRANSMITTER.


WDØHCO - Biz


If you don't get an answer--the FT-243 rocks are fundamental cuts. It
would be easy to build an untuned Colpitts oscillator, and use a counter
to determine the crystal frequency. A simple c-mos IC oscillator would
probably also work.

Pete