Re: [IRCA] Cable connectors

[george magiros <gmagiros@xxxxxxxxx>]

According to this the twisting is about preventing radiation and therefore
crosstalk.
https://www.bicsi.org/pdf/presentations/dubai2009/G%20Humbert.pdf

 <http://img94.imageshack.us/i/screenshotidw.png/>
http://img94.imageshack.us/img94/8149/screenshotidw.png


On Mon, Sep 6, 2010 at 8:11 PM, <rfoxwor1@xxxxxxxxxxxxxxx> wrote:

>
> ---- Russ Edmunds <wb2bjh@xxxxxxxxx> wrote:
> > I seem to recall that 'back in the day', Gordon Nelson was concerned
> about keeping the feedlines from his loops as short as practical for the
> application. Realizing that his recommended feedline was car radio cable
> with the original center conductor removed and replaced by insulated #22 or
> so ( with the braid soldered together on each line about every foot ) I
> wonder if it is in fact possible to get what you're aiming for.
> >
> > I don't recall the specific electrical and/or magnetic characteristics of
> that type of feedline vs. coax, but perhaps that too has some relevance here
> in that he eliminated using coax for a specific reason, which alas I also
> don't recall.
> >
> > Russ Edmunds
>
> The only thing I can think of would be to lower the capacitance (per foot)
> of
> the cable itself. This is the reason that type of cable was spec'ed for
> car radios which had a compression trimmer that had to be peaked (at 1400
> kc)
> for the specific car whip being used. Now that I think about it, real
> commercial
> grade coax contains spacers to keep the center conductor equidistant from
> all parts of the shield. Running in your own #22 wire for the center
> conductor
> after removing the original wire (I guess it was too flimsy) would lead to
> the
> wire being adjacent to the shield almost everywhere. Not sure how important
> that would be. I did that once, 40 years ago, but forget the details.
>
> - Bob
>
>
>
> _______________________________________________
> IRCA mailing list
> IRCA@xxxxxxxxxxxxxxxx
> http://montreal.kotalampi.com/mailman/listinfo/irca
>
> Opinions expressed in messages on this mailing list are those of the
> original contributors and do not necessarily reflect the opinion of the
> IRCA, its editors, publishing staff, or officers
>
> For more information: http://www.ircaonline.org
>
> To Post a message: irca@xxxxxxxxxxxxxxxx
>
>
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx