[AMRadio] NC300 Oscillator Tracking Nightmare - Success!

[russ dworakowski]

Yes,  its  darn  good   for 1955 technology.  Russ.






>From: "Tommye & Jim Wilhite" <w5jo at alluretech.net>
>Reply-To: amradio at mailman.qth.net
>To: <amradio at mailman.qth.net>
>Subject: Re: [AMRadio] NC300 Oscillator Tracking Nightmare - Success!
>Date: Wed, 20 Nov 2002 09:23:45 -0700
>
>Right on Russ.  Mine is sensitive, quite and with both the crystal filter
>and IF selectivity, able to copy stations many receivers cannot do.  My 
>only
>two complaints about the rig is the alignment of the coils in the front end
>and L6 which can be a bear to get right.  You will find a service bulletin
>about replacing the coil in L6 with a crystal.  I didn't have to replace 
>any
>caps in it either and unlike most National receivers, didn't even have to
>replace resistors.
>
>Jim de W5JO
>
>
>
> > 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 <Foltarz at rocketmail.com>
> > >Reply-To: amradio at mailman.qth.net
> > >To: amradio at mailman.qth.net
> > >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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