[AMRadio] NC-183D Alignment questions help


ronnie.hull ronnie.hull at glowbugs.com
Wed Sep 26 18:17:40 EDT 2007


I sure wish I hadn't had to sell mine!!

Ronnie

On Wed, 26 Sep 2007 08:50:17 -0500, Jim Wilhite wrote
> 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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