[R-390] R-390 Digest, Vol 68, Issue 9

[Glenn Little WB4UIV]

Raychem makes a piece that will serve your needs.
This is a piece of heat shrink tubing (clear) with a solder preform 
and a short pigtail installed.
You prep the cable and slip this assembly over the shield.
Then you shrink the tubing, the solder preform melts, soldering the 
pigtail to the shield.

You can achieve the same results by soldering a pigtail to the shield 
then covering it with shrink tubing.

IIRC the crimp device is multiple parts.
There would be a piece that slips under the shield and another that 
slips over the shield and you place the pigtail between the shield 
and the outter piece (ferrule).
In the case of the R-390 cables, the ferrule has a yellow plastic 
cover as in an insulated crimp lug.
The yellow color usually indicates the inner diameter of the ferrule.

If I were to do this, I would prep the shielded cable and slide a 
piece of Teflon tubing under the shield.
The Teflon tubing is to insulate the conductors in the shield from 
the soldering temperature.
Then I would solder a pigtail to the shield using extra flux if the 
shield is not real shinny.
The extra flux is to clean the shield copper as quickly as possible 
top minimize the soldering time.
I would then remove the excess flux with alcohol and place a piece of 
shrink tubing over the exposed shield and solder connection.
I would then shrink the tubing and call it done.

73
Glenn
WB4UIV




At 12:43 PM 12/13/2009, SHELLY199 at aol.com wrote:
>Hello all,
>Does anyone have a source for the yellow shield crimp connectors used it
>the R390A.  These would be the yellow crimp connectors for the shields of
>the cables going to the audio and RF Gain pots.  I've looked  everywhere and
>come up with nil.
>Tks Rich wd2q
>
>
>In a message dated 12/13/2009 12:01:19 P.M. Eastern Standard Time,
>r-390-request at mailman.qth.net writes:
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>Today's Topics:
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>1. R-1981  stuff (Tom  Frobase)
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>----------------------------------------------------------------------
>
>Message:  1
>Date: Sat, 12 Dec 2009 21:02:23 -0600
>From: Tom Frobase  <tfrobase at gmail.com>
>Subject: [R-390] R-1981 stuff
>To:  R-390 at mailman.qth.net
>Message-ID:  <4B24593F.1000905 at gmail.com>
>Content-Type: text/plain;  charset=ISO-8859-1; format=flowed
>
>I have a set of adapters for the  R-390A for external access to the first
>and second converters and the  PTO.  The parts are adapters with relays
>and external coax connectors  that fit in the tube sockets of the
>associated modules.  I pulled  them off of a very clean 1958 Motorola.
>If anyone is interested in  them contact me off line 73, tom,  N3LLL
>
>
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>End  of R-390 Digest, Vol 68, Issue  9
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