[Elecraft] K3: reverse 12 volt supply

[Bob McGraw - K4TAX]

Just take zip cord from Powerwerx or Wireman, clamp one end in a vice 
and the other in a drill, pull back tight and let the drill do the 
twisting.  Now you have the best of both worlds.............what ever 
"best" happens to be.

Belden makes a cable, grey jacket, inside is a foil shield with a drain, 
and a black and a white twisted, and a #12 strand inside.  In this 
case,  one has a shielded twisted pair suitable for 20 amps DC or so.  
Works quite nice.  I use this for my mobile and travel trailer 
installations.............along with some professional sound 
installations.    I forget the Belden number but if some one needs it, 
let me know.   There is a 500 foot spool at my shop.

73
Bob, K4TAX
K3S s/n 10,163

On 9/15/2015 7:48 PM, Guy Olinger K2AV wrote:
> That would work for stuff that doesn't move much. I should do that for a
> lot of my soon to be rewired fixed operating position. But 7 wire stranded
> THHN is still not rated for normal flexing or vibration. That's the zip
> cord with fine stranded wire. I think that making the last six inches to a
> rig connection fine stranded, appropriately heavy zip cord might be best of
> both worlds.
>
> 73, Guy K2AV
>
> On Tue, Sep 15, 2015 at 3:05 PM, Jim Brown <jim at audiosystemsgroup.com>
> wrote:
>
>> On Tue,9/15/2015 11:55 AM, Walter Underwood wrote:
>>
>>> Powerwerx has red/black zip cord from 24 gauge to 2 gauge.
>>>
>> Zip cord is NOT good for ANY application, because it is inherently
>> susceptible to RFI. TWISTED PAIR is FAR better, because it inherently
>> rejects interference from low audio frequencies to at least VHF. In the
>> last few years, I've been replacing more of my DC wiring with twisted pair.
>> I make it by putting black and white stranded THHN in a drill, the other
>> end in a vise, and twisting.
>>
>> 73, Jim K9YC
>>
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