[R-390] Mechanical Filter Issue

[JMILLER1706 at cfl.rr.com]

I have heard it said that there are slug permeability differences between some of the racks, not sure which.  Seems they may have colored dots on them to indicate their category.  I think the differences are between the mixer slugs and the RF slugs, but I am not 100% sure.  Sorry, that's the best I can do without opening a radio and looking.

----- Original Message -----
From: Cecil Acuff <chacuff at cableone.net>
Date: Monday, January 3, 2005 12:45 pm
Subject: Re: [R-390] Mechanical Filter Issue

> High Leigh and Group,
> 
>        I did the same thing.  From what I understand there is no 
> problem 
> mixing up the slug racks in the A model.  If it were an R-390/URR 
> it would 
> be a problem.  Seems all the slugs in the big racks are the 
> same...but don't 
> mix them up with the slugs in the small racks.
> 
> Someone else jump in here if I am misleading him!
> 
> Cecil..
> ----- Original Message ----- 
> From: "Leigh Sedgwick" <bipi at comcast.net>
> To: "R390 List" <r-390 at mailman.qth.net>
> Sent: Monday, January 03, 2005 11:02 AM
> Subject: [R-390] Mechanical Filter Issue
> 
> 
> > Hi Gang,
> >
> > On the a different subject.  My restoration R-390A project
> > is just about finished.  I rebuilt the RF deck and recapped
> > the IF deck and AF decks.  The smoke test was positive with
> > signals on all bands, although it is way out of alignment.
> > But I have a couple of issues.
> >
> > 1.  Three of the four mechanical filters appear to work
> > fine.  But, when I switch to the 0.1, 1, and 2 bandwidth
> > positions, there are no signals.  Is there any quick check I
> > can make to ensure it is the 2 khz mechanical filter and not
> > something else in the circuit?  It looks like a bit of work
> > to replace and I would hate to go through that effort only
> > to find out it is actually something else.
> >
> > 2.  I tore the RF deck apart with the idea I would get it
> > rebuilt within a week or 2.  No such luck...work issues
> > caused a significant delay of almost a year before I was
> > able to get back and finish it.  During that time, I lost
> > track of the ordering of the slug racks and was forced to go
> > with a "best fit" approach to reassembling them.  Other than
> > the fact that the alignment is totally hosed up, will I be
> > faced with any other issues, i.e., are they all identical or
> > are there differences I cannot see visually.  I saw
> > something on the FAQ page that some are different.  They all
> > looked the same to me.
> >
> > Thanks for any help.
> >
> > Happy New Year
> >
> > 73 de Mike
> > K7PI
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> 
> 
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