Re: Matched xtals #ubitx #bitx40

DuWayne Schmidlkofer

The filter was developed by Lee Jones of TenTec, and patented in 1991, ande commonly as a Jones filter.  It has been used by TenTec, Elecraft and several others.
The problem most often found is that the center frequency changes slightly when the bandwidth is changed.  There was a modification to this design that corrected this in a magazine article a few years ago.  I will try to find it and post more information. 
DuWayne  KV4QB

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