All the capacitors are the same value. For single sideband use 39pf. For CW use 100pf for a bandwidth of 700 to 1000Hz. Use 300pf for a bandwidth of 500 to 700Hz. The crystals used are 3.457MHz available from BG Micro and other parts catalog businesses.

This design comes from some articles in QST on the design of crystal ladder filters.

The first one is "Ladder Crystal Filter Design", by J. A. Hardcastle, November 1980, QST, Page 20. This article was a little scary with all the formulas and such, and he only explored one filter using 8.454MHz crystals. His outlines and formulas weren't that difficult to follow, but the article didn't exactly make you want to rush to build one.

The second one is "A Unified Approach to the Design of Crystal Ladder Filters", by Wes Hayward, May 1982, QST, Page 21. This was the first article that hinted at the fact that regular computer crystals or color burst crystals could be used in a very effective homebrew crystal filter. Be aware that Fig. 3 in the article doesn't include the values for the toroids. The feedback for that appeared in the July 1987 issue of QST, Page 41. Circuits needed to evaluate crystals were given, however, he included the statement "None of the filter circuits in this paper is suitable for exact duplication."

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