[Elecraft] K3 going expeditionary

[Mike Short]

RFI on audio, agreed. Noise on DC, not so much. Routing is the most
important factor for DC power. It is hard to get enough turns on the proper
size wire to make a difference.



On Mon, Aug 24, 2020 at 10:24 AM Jim Brown <jim at audiosystemsgroup.com>
wrote:

> On 8/24/2020 8:11 AM, Mike Short wrote:
> > Twisting the wires doesn’t do anything.
>
> Au contraire!  Twisting provides an excellent rejection of of crosstalk,
> including RFI. Have you not noticed that CAT5/6/7 cables are four
> tightly twisted pairs, each with a slightly different twist ratio, all
> very well engineered to minimize crosstalk between them?  Twisted pair
> has been widely used in pro audio for a century. Beginning with the
> earliest days of telephony, their cables were run on the same poles as
> AC, with a crossover every other pole to provide the twist (the only
> rejection needed was at 60 Hz, 50 Hz in EU).
>
> Those who make and sell zip cord, glorified or otherwise, as speaker
> cable are ignorant of this. When I lived in Chicago, I solved a lot of
> RFI to home stereo systems by replacing such with twisted pair.
>
> 73, Jim K9YC
>
>
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