Scott.?
You are trying to set the signal generator and the pitch control to the xtal frequency simultaneously.?
The remarks column gives the procedure. The sig gen will peak at ?xtal freq, the pitch will dip to minimum. The correct spot is when they coincide. The pitch will attenuate the sig gen giving the ¡°lowest peak¡± / ¡°maximum dip¡±.
1. Adjust pitch to min.?
2. Adjust gen to peak.?
3. Repeat until 1and 2coincide.?
Start at one end of pitch range and slowly move toward the other end. Do not reverse the pitch control.?
73
Dick. K9FFK
Sent from my iThing which often corrects my typing and what I say.?
toggle quoted message
Show quoted text
On Nov 3, 2022, at 1:36 PM, Scott Petersen <s-petersen@...> wrote:
?
I'm a little foggy on this, but I believe you are supposed to set it for highest output I think
So ¨C this is something I¡¯ve gone over and over again in the alignment instructions and I can¡¯t find an answer.? Hallicrafters wants the IF aligned to the frequency of the crystal (which is almost certainly
not going to be on exactly 455 KHz).? To identify the crystal frequency, you slowly sweep the signal generator above or below 455 KHz until you discover a sharp notch.? I¡¯ve done that ¨C no problem.? But, here¡¯s the catch:? the location of that notch can vary
rather signficantly with the position of the crystal phasing control, and there¡¯s nothing in the alignment instructions about the correct position for the phasing control.? Been scratching my head over this, and so far I haven¡¯t found any information about
it online.? Anyone here run into this before and have an answer?
?
73 ¨C Steve, KW4H
