In message , Scott Dorsey
writes
gareth wrote:
"Peter Able" stuck@home wrote in message
IMHO, Peter's reply is the correct opening statement of a response to your
rather unstructured question. If you cannot then use this statement to
seed and to refine your own thought process, it might be more helpful if
you elaborated the point that you think he is missing.

Thanks. but the subject matter seems to have WHOOSHED over your head.

Mine too, I don't really understand what you're asking. The crystal filter
is a bandpass filter. The phasing control affects the symmetry of the
filter somewhat (but not really all that much).
--scott

The crystal by itself has a natural 'blow-suck' signal throughput, with
a sharp notch just HF of the peak. The phasing control capacitor should
be able to move the notch to the LF side of the peak, and also (to a
limited extent) to move the notch a little closer to the peak (on either
side).
--
Ian