Jim. Are you talking about the small trimmer caps across the coils or are
you speaking of the main tuning and bandspread tuning capacitors?? Van
(already noted and tried the slow upside on the trimmers with no luck. I
can get it to track pretty close by setting the tracking on the ham band I
am going to use it on (75 meters). And seems to be fairly close on the
bdcst band, not as good as I would like it and then it goes to hell in a
handbasket! HI HI. Van
----- Original Message -----
From: "Jim Wilhite" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<amradio@mailman.qth.net>
Sent: Wednesday, September 26, 2007 6:50 AM
Subject: Re: [AMRadio] NC-183D Alignment questions help
Van this is a problem with the 183D. I suspect the heat generated in the
closed cabinet has an effect on the inductance of the coils. They are
made of what looks like cardboard dipped in varnish and I had a couple of
the IF transformers that were warped to actually bind the slugs enough
that when I tried to move them the screw pulled out of the core.
If the inductance of the oscillator coils has changed then it is a real
problem. Do be sure the trimmer caps are on the correct side of the curve
as Larry mentions. It is difficult, but as you tune through the peak, on
one side the increase will be a bit slower than the other side of the
peak. It will rise slowly then fall rapidly or the reverse. You want on
the slow side and not past it.
I managed to get mine fairly close by cleaning the contacts of the tuning
capacitor and on a couple of the oscillator coils the wire is at very
maximum inductance, but the dial is close. Good luck and have fun. Great
receiver when is works properly.
73
Jim/W5JO
Hi,
I found on a National RX one time that the oscillator was on the wrong
side. If it should be high, it was low or visa versa. Be sure that is
not your case as that will make tracking impossible.
Larry
W3LW
At 01:03 AM 9/26/2007,
I have a pristine NC-183D I picked up a year ago that I am finally
getting around to. Have replaced all the electrolytics and sound really
good. BUT...I cannot get it to track properly as I follow the alignment
instructions in the manual.
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