[Milsurplus] FT-241 surplus LF crystals chan - freq list ?

[Hubert Miller]

It sounds like you are talking about an HF filter using surplus computer crystals. I was talking about something quite different, which was the 
filter circuits published in the 1950s for using those surplus LF crystals, with specific channel crystals picked out.  I am not actually  interested 
in getting into the crystal filters business, as I'm not going to be scratch building anything. But I'm sure it's fun, and it is interesting to read
the procedures.
-Hue 

Subject: Re: [Milsurplus] FT-241 surplus LF crystals chan - freq list ?

>Hi
If you are going to build a lattice filter, first step is to see what the biggest pile of crystals is (frequency wise).
Next step is to set up a simple sort process to “bin” them by frequency. Once you have all that, you design the filter around what you happen to have. If this sounds bizarre ….. you haven’t been in the crystal filter business .
“Enhancing” even a simple test set to get reasonable motional parameters is easier than you might think ….

The bottom line is that in this day and age of fancy computer analysis software, it is easier to fiddle the design than to fiddle the crystals. 

Bob