[R-390] Mechanical Filter Issue

Leigh Sedgwick bipi at comcast.net
Mon Jan 3 12:02:41 EST 2005


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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