[R-390] R-390A rf slug needed, also clamp.

[Fred Moore]

Oh, Yes!  That's perfect.  That is why I was remembering that the slugs were
not all the same -- they weren't on the R-390.  There, too, is the test --
does the receiver align and work on that octave?  Thanks, Roger AI4NI, and
Roy, for finding that.  -Fred

------ Original Message ------
Received: Mon, 10 Aug 2020 02:44:28 AM GMT
From: Roy Morgan <k1lky68 at gmail.com>
To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
<r-390 at mailman.qth.net>
Subject: Re: [R-390] R-390A rf slug needed, also clamp.

(This email may not get out to the list, if I am enrolled at a different
address.  Bob please forward to the list if you do not see it show up there.)

This email from Roger in 2009 has good information:


From: Flowertime01 at wmconnect.com
Date: May 17, 2009 3:27:36 PM EDT
To: r-390 at mailman.qth.net
Subject: Re: [R-390] R390A RF Deck slug indentification

Brian,

Slugs popped up just last month as a topic.

The R390/A has just two types of slugs. One type in all 8 octaves of the RF 
section 3 x8 = 24. Type two is in the variable IF section of the RF deck. 
These are 6 each in the IF section behind the 8 octaves of RF cans at the 
front of the RF deck.

The original R390 had different slugs in the various sections of the 8 
Octaves. So all 24 were not the same. But any three in an octave are the
same.

R390 and R390/A slug sizes are all the same.
The spring wire can be soldered and or glued back together.
Original slugs were all spline.

If you have a slotted slug bolt it is not likely original.
It may have the original slug under it and it could be a repair.
It could be a late year replacement part. Being easier to put a slotted 
bolt on the slug than to obtain the spline bolts.

If it operates well let it be.

If the octave will not align and peak as well as the other octaves, then 
post a request here for one replacement. Several of the Fellows have some 
spare parts and for a reasonable cost and postage will send you a good 
replacement.

The slugs did have color coded paint dots on them.

There were lots of differences. The color dots were not any assurance the 
slugs were correct. The only real test was to install a slug. Do the 
alignment and power measurements. If the receiver worked to spec the slug was

acceptable.

You may see different paint dots on the slugs within a given receiver.

Roger AI4NI


> On Aug 8, 2020, at 2:07 PM, Bob Weiss <bobweiss1967 at gmail.com> wrote:
> 
> To my knowledge, all the RF slugs are the same, and all the IF slugs are
> the same. But the 2 types are not interchangeable.
> 
> 73,
> Bob Weiss N2IXK
> 
> On Sat, Aug 8, 2020 at 11:34 AM Phil <pmills7 at comcast.net> wrote:
> 
>> I am trying to repair restore an R-390A that has
>> evolved into a multi-year project but I am almost
>> at completion. 

Roy Morgan
K1LKY since 1958
k1lky68 at gmail.com




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