[R-390] Request help in making a survey...

[nryan at mchsi.com]

Hello, Randy and Group,

Here is what I found in two Motorola RF decks and one EAC R-390A RF deck:
Color dots are just as you state -- green dot for IF slugs, red-white dots for RF slugs.

However, the EAC R-390A had no dots on its RF slugs (IF decks had green dots).  Instead I found the following inscription printed on each RF slug:
the Collins logo
526-5006-003
SM-C 249245
6642

I also looked at two R-390 RF decks and one R-391 RF deck and found the slugs scheme to be more involved.  Makes are Collins and Motorola.  Order shown is as viewed from above with the receiver front facing you -- rearmost coil to frontmost coil, then proceeding left to right:

Z222 red
Z223  "
Z224  "
=======
Z221 blue
Z220  "
Z219  "
=======
*Z218 blue
*Z212  "
*Z206  "
T206 red-white
=======
Z217 blue
Z211  "
Z205  "
T205 blue-white
=======
Z216 red
Z210  "
Z204  "
T204  "
=======
Z215 yellow
Z209   "
Z203   "
T203   "
=======
Z213 yellow
Z207   "
Z201   "
T201 orange-white
=======
Z214 yellow
Z208   "
Z202   "
T202 orange-white

Please note:  Coils marked with * have slimmer slugs.

I hope this helps.

73 de Norman, KG4SWM


----- Original Message -----
From: Randy and Sherry Guttery <comcents at bellsouth.net>
To: R-390-List <R-390 at mailman.qth.net>
Sent: Sat, 11 Jun 2011 16:22:44 -0500 (CDT)
Subject: [R-390] Request help in making a survey...

I've finally been able to get back to working on some of the 
updates I'm doing for the 390A Y2K manual (weather and work 
issues combined such that I haven't had much spare time for 
a couple of months...  we're still seeing some 
thunderstorms, etc. - but NOTHING compared to April)-

Anyway - one of the things that I can't find documented 
anywhere - is the color coding of the ferrite slugs.  Seems 
in most of the radios I have looked at lately -  "A" radios 
have RF section slugs with a Red and White mark,  IF section 
slugs with a Green and Brown mark.  However - I've also come 
across slugs with just a green mark, some with just brown - 
and of course slugs that don't appear to have any marks at all.

The 390/1s are another case altogether - seems like the RF 
input has Red/White - 2nd RF another color, third and forth 
yet other colors (orange and yellow IIRC).  The IF is also a 
mix (blue and green mostly).  As old as they are - it's 
sometimes hard to tell whether there is a color - or 
discoloration on some...

So here is my request:

Next time you get an opportunity - note the manufacturer of 
your RF chassis, and note any  color dots / marks on the 
slugs. For those that may not have noticed them - the dots 
(or blob/s of paint) are usually on the top end of the slug 
- around or either side of the "spring" that holds it to the 
adjustment screw.

  It's pretty easy to tell the "A"s from the 0/1s by the 
extra colors - but if you do have an "0/1" with a "standard 
set" - please be sure and note that (i.e. all RFs Red/White 
& all IFs Green/Brown).

Please send your responses either via the list -- or if you 
prefer - directly at comcents at bellsouth.net .  Again - these 
will be documented and added to the 390A Y2K manual (and a 
separate table for inclusion with a manual for the 0/1s).

Thanks!
best regards...

-- 
randy guttery

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