[R-390] Z202-1

[Les Locklear]

That is the part that is most likely to break.............the slug gets 
stuck and then the coil turns breaking the wire.

Open it up and fix the break, they usually break in a visible area. Epoxy 
the coil so it won't move and free up the slug so it can move freely. I 
would bet Fair is out of them. If they have them, it will be at a premium 
price.

American Trans coil at one point was manufacturing them new for Government 
orders up until maybe 10 years ago.

I'm not sure if their website even exists anymore.

Les

-----Original Message----- 
From: Dennis Wade
Sent: Saturday, April 11, 2015 12:50 PM
To: R-390 HF Receiver List
Subject: [R-390] Z202-1

Good morning all,

         Well I've pretty much completed (I thought) the work on my
Motorola 390A.  Went through a complete alignment, set up the IF deck,
rolled back the gain some and took some final sensitivity checks.  I was
very pleased to see that spot checking all the bands yielded somewhere
between 0.4 and 0.6 uv for 10 db S+N/N taken as described by Chuck, and
this was without going through any real optimizing of tubes and such.  This
included the 1-2 mhz band.

       ( When I adjusted the Z202-1 RF coil, I noticed there was quite a
bit of change from the last alignment settings.  All the other RF coils
were very close to their previous settings).

        Then one night I went to listen to a local AM station on 1530 and
its signal was way down...less than 20 on the carrier meter when it was
usually near 60+.  On a hunch I checked Z202-1.  Sure enough it wanted to
peak back where it was before the alignment, with the slug almost all the
way down.  Peaking it down that far yields better sensitivity, but not as
good as before.

         Anyone have a spare Z202-1 they want to let me try?  Or, how
re-buildable are they?

                Thoughts?

            Dennis



-- 
"If they trust you, it is an extraordinary privilege, and you simply can't
abuse it."
      - A. Alan Post  1914-2011.  California Legislative Analyst 1949-1977.

-------------------------
Dennis L. Wade
KG6ZI
Carmichael, CA
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