Topband: Control cable black conductors

[goldtr8 at charter.net]

Lime away will clean it also .    But you have to rinse the wire off to 
remove residuals.

~73
Don
KD8NNU
FH#4107
-.- -.. ---.. –. –. ..-


On Sat, Feb 22, 2014 at 5:15 AM, Dave G4GED wrote:

> Hi and thanks for reading.
>
> I'm trying to splice a damaged (rodents) RX ant control cable.
> It has 7 insulated, stranded copper conductors all inside a PVC 
> jacket.
> Problem is, when stripped of their insulation, 3 (black, brown and 
> green), of the copper conductors have become coated in a black film? 
> So to effect jointing and soldering, require cleaning.
> I've tried IPA 170 and several contact cleaners but none remove it.
> So far, only Emery Cloth will do the job but it's very difficult to 
> clean each strand without breaking some and therefore weakening the 
> joint.
> All the other 4 conductors are bright clean copper when stripped.
> Could anyone tell me why some insulated copper conductors turn black 
> in this way and whether there's a better way of cleaning it off.
>
> Thanks in advance.
> Dave
>
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