In article ,
"gareth" wrote:

"Scott Dorsey" wrote in message
...
gareth wrote:
"Scott Dorsey" wrote in message
Perhaps you, as indeed do others seem, are trying to interpret a
technique
from
the 1930s and 1940s in terms of the multi-pole Xtal filters that are the
norm today?
Well, yes. That is the point of this thread, isn't it?
No, it isn't.
I have a junk box going back 50 years from which I intend to make the sort
of RX that I dreamed of as a teenager in the 1960s, on the basis that if I
do
not make use of all those museum bits and pieces, the executor of my will
will be likely to bin the lot.
I am inspired by the ham-bands only Eddystone EA12 and am making slow
progress
in a DIY effort to manufacture the gears for the dial drive and am now
considering
the manufacture of a Catacomb along the lines of the National NC100X.
One technique from those pre-mechanical, and multi-pole or monolithic
Xtal, filters was to use a _SINGLE_ crystal early on in the IF chain, and
it
is that
single crystal together with its phasing control that interests me at the
moment.
Yes, and you would like to understand how that device works in terms of
modern nyquist filter theory, correct?

Harry Nyquist is far from modern, I have somewhere an essay of his from
1924,
something along the lines of, "Certain topics in telegraph theory"


What I was after was the standard way of setting up the phasing together
with
the BFO for eliminating an interfering carrier that was equally spaced from
the BFO
frequency on the other side.

Once you have tuned the radio (VFO) to get the wanted signal at the
centre of the crystal passband, you can set the BFO to taste and
altering the phasing of the crystal will not alter the IF frequency of
the wanted signal so won't alter the beat note. If the phasing shifts
the crystal pass band significantly (which it probably won't) you might
need to retune the radio (VFO) slightly and then the beat note would
alter so you might have to adjust the BFO to taste again. But the BFO
won't alter where the signal is in the passband, and the crystal phasing
won't alter the beat note when it is adjusted. Only changing the VFO
could do that.

--

Percy Picacity