[R-390] Z202-1

[Ryan Scott]

I recently acquired 5 of these Z202 1-2MC collins 278-0121-00  coils NOS at
the puyallup hamfest.  They look just like the R390 coils but I don't want
to pull my R390 out to be sure.  The fed PN is 5950-392-6714.  Are these
the coils you are speaking of?  If so I can probably spare one cheap.

Regards,
Ryan N7QJ

On Sat, Apr 11, 2015 at 11:02 AM, Les Locklear <leslocklear at hotmail.com>
wrote:

>
> 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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-- 
Ryan P. Scott
n7qj at arrl.net
503-880-1214