On 08/24/2013 03:06 PM, gareth wrote:
I wonder if some more experienced and senior (in the literal sense) amateur
could explain to me one difficulty that I have in understanding single
signal
reception with the crystal phasing control?

AIUI, the phasing control is adjusted so that the frequency that would give
the audio image is phased out by being in the notch.

If that is true, how is it then possible to adjust the BFO to a
pleasant-for-you tone,
because such adjustment will alter the CIO frequency?

Surely the BFO has to be set in advance to be halfway between the serial
resonant
frequency and the notchable parallel resonant frequency?

This is a query stimulated by my current project which is to build a
boatanchor style
RX, with a flywheel-loaded slide rule dial like that of the Eddystone EA12





Your question is rather unfocused. You have not even given details as to
the filter type...viz: chebychev filter, butterworth filter. etc.

Additionally, the BFO has nothing at all to do with filtering and
as you have seen by the answers here, only confuses the issue.


Once you have your thoughts organized feel free to post back with a
coherent question. There is no need for you to talk rudely to those who
have attempted to answer your ill-formed query.


I've been licensed since 1964 so may very well qualify as senior and
experienced. As to knowledgeable...? I'm still in the learning phase.


Now that I think of it, it appears perhaps that you have only been
attempting to be humorous. Throughout my Usenet peregrinations I view
your phraseology as being analogous to that class of inquiry oft posted
during the zeroth +1 day of April.