Re: [IRCA] 4 Foot Box Loop Plans

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

I have an 'original' NRC 4' loop which was designed and built by the lat Gordon Nelson, which I purchased from him in 1969. This design is 4' on the diagonal. 

DX'ers have varied that design anywhere from my ( 1969-70 ) 2' loop design ( also in the NRC Antenna Manual ) to various other sizes up to 5 or 6'. These changes were part experimentation, and part born of necessity in that the original loop does consume a fair amount of space.

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 Fri, 1/9/09, Nick Hall-Patch <nhp@xxxxxxxx> wrote:

> From: Nick Hall-Patch <nhp@xxxxxxxx>
> Subject: Re: [IRCA] 4 Foot Box Loop Plans
> To: "Mailing list for the International Radio Club of America" <irca@xxxxxxxxxxxxxxxx>
> Date: Friday, January 9, 2009, 2:49 PM
> At 14:45 1/9/2009, you wrote:
> 
> >I have read lots about the 4 Foot (NRC) box loop in the
> past week on the
> >IRCA reflector.  I searched and found plans for it,
> online.  Not sure if
> >it's the NRC version but here is the first link.
> 
> These aren't exactly the same loop as Gordon Nelson
> designed and which was in earlier versions of the NRC's
> antenna reference manual, Dave, but will likely have similar
> sensitivity.   
> 
> The NRC altazimuth loop design was intended among other
> things to act as a direction finder, and to optimize nulls,
> so the construction plans are very specific, so as to not
> introduce "vertical effect" from imbalances in the
> winding, or instability of the frame.   
> 
> For many users, this would be overkill, however.
> 
> A question:  all these loops are approximately four feet on
> the diagonal, but I've seen loops that are about 4 feet
> on a side.  Was that also an NRC design?  If so, it
> isn't in my ancient antenna reference manual.
> 
> best wishes,
> 
> Nick
> 
> 
> 
> 
> 
> *****************************
> Nick Hall-Patch
> Victoria, BC
> Canada 
> 
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