"gareth" wrote in message
...
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



This subject matter illustrates a saying of Mrs.Nugatory, "For those who
know the
subject matter, no explanation is necessary, but for those who don't, no
explanation
is possible".

And what a pity that Mrs.Nugatory has not blessed us with her opinion, for I
feel
sure that she is the one person who would have the answer at her fingertips,
resulting
from her experiences with the HRO series of receivers.

But what I don't understand is the allegation of abuse laid at my door (in
many cases
by people who used it as an excuse to heap abuse in my direction;
particularly the Baying
Mob from ura most of whom have joined the thread, not to contribute to it,
but merely
as a vehicle to express their own infantile habituation) because I have
informed those who
have gone off at a tangent, but otherwise thanked them for their
contributions.

How is that abusive? Would it not have been ruder to ignore irrelevant
contributions without
acknowledging them?

But the fact remains that for those who understand the use of a crystal
phasing control in pre-1950
receivers that the questions as posed above are as completely informative as
is necessary.