Mark, hope you like the beans... the NC-300 is a unique rx in that it
does not run hot, never done any coupling/ bypass cap
replacements/ never needed them. I had a power supply choke
open up, the ususal 4H4 ballast, few week tubes, just align the
thing, when you think its performance is anemic.
From: Mark Foltarz <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success!
Date: Tue, 19 Nov 2002 00:02:15 -0800 (PST)
Well after two days of fiddling around I finally got
it.
I went back over the IF alignment. Apparently I got
this right the first time around.
The one thing that was not mentioned in the manual (
at least the copy on the BAMA site) was that the coils
for 40 - 10 have TWO adjusting turns available for
setting the bottom end of the oscillator tracking.
Once I figured that out it all seemed to snap into
place. 10 meter through 40 meter bands came together
pretty quickly.
Then while attempting to adjust the 160 & 80 meter
oscillator coils I discovered that the adjusting turns
were fatigued to the point where they were broken. It
was obvious that someone had really screwed around
with this radio.
After a bunch of chassis, potentiometer, and switch
cleaning, this hulk of a radio is coming to life.
Thanks Jim, Gary and Russ for the info.
73 DE KA4JVY
Mark
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