Hi Bob,

But the intended thrust of this email is to ask about if anyone can find
a reference to a BESSEL BANDPASS filter.

"Electronic Filter Design Handbook" by Williams and Taylor
has a section on "Capacitive Coupled Resonant" bandpass filters.
(These are the kind where a number of parallel tuned circuits are coupled
together via capacitors)

The book offers a table for Bessel parameters.

It does a design for "constant delay over passband" bandpass using the
Bessel tables...

Let me know if you could use a photocopy of a few pages.....

......................... Zim ............. VK3GJZ