Re: [IRCA] Cable connectors

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

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
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
<wb2bjh@xxxxxxxxx>
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot


--- On Mon, 9/6/10, Craig Healy <bubba@xxxxxxxxxxxxxxxxxxxx> wrote:

> From: Craig Healy <bubba@xxxxxxxxxxxxxxxxxxxx>
> Subject: Re: [IRCA] Cable connectors
> To: "Mailing list for the International Radio Club of America" <irca@xxxxxxxxxxxxxxxx>
> Date: Monday, September 6, 2010, 6:12 PM
> OK, one other thought...
> 
> The goal is to reduce the signal ingress on an antenna
> cable to the lowest possible level.  What if the
> receive end was run through a transformer to open the ground
> connection.  Then, a single wire was run parallel right
> next to the coax for the entire length.  Then coupled
> out of phase with the shield on the coax itself?  I
> have to wonder if that could be tweaked to drop the ingress
> signals by canceling them out?  A 180 degree
> transformer keeps that phase over a wide frequency range so
> it wouldn't be a frequency-specific null.
> 
> The main reason I started this whole project is that the
> ingress spoiled any null I could get with two loops spread
> about 150' apart.  Even the null of the loop itself was
> negligent.  By clearing out the ingress, it may be
> possible to set two loops pretty far apart and positioned to
> null a pest. Then the two loops could be phased to deepen
> the null or even null a second pest on the same frequency.
> 
> Craig Healy
> Providence, RI
> 
> 
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