Re: [IRCA] [NRC-AM] Re: [dxhub] Questions on Loop Antennas

["Bob Young" <youngbob53@xxxxxxx>]

Loops will work OK in a basement below ground level but as Russ said they 
will work better at or above ground level. There are some fairly simple 
loops in the first two NRC antenna books, one is a Harley loop, I built one 
some years ago and it worked fairly well and was easy to make. I also made a 
Wedge some years ago, it was a little more complex but was still simple and 
worked well, both use only a variable cap.

Bob Young
Millbury, Ma

>From: "Tom Jasinski" <amdxer@xxxxxxxx>
>Reply-To: am@xxxxxxxxxxx
>To: <irca@xxxxxxxxxxxxxxxx>, <am@xxxxxxxxxxx>, <dxhub@xxxxxxxxxxxxxxx>
>Subject: [NRC-AM] Re: [dxhub] Questions on Loop Antennas
>Date: Mon, 30 Oct 2006 17:30:36 -0600
>
>I have used both a home made 2 1/2 foot spiral wound loop and the Quantum
>Loop in my basement and they both worked well.  Basement wall is 9" 
>concrete
>and my desk is about 5 feet below grade level.
>
>Tom Jasinski
>Shorewood, IL
>
>----- Original Message -----
>From: "Russ Edmunds" <wb2bjh@xxxxxxxxx>
>To: <dxhub@xxxxxxxxxxxxxxx>
>Sent: Sunday, October 29, 2006 3:19 PM
>Subject: Re: [dxhub] Questions on Loop Antennas
>
>
>
>
>--- joecatch2001 <joe@xxxxxxxxxxx> wrote:
>
> > So my questions are:
> > 1. Does a loop have to be located high off the ground or would it
> > work in a raise ranch where the basement is half below ground?
>
>A loop will work less well below grade than at ground level. The effect
>will be noticeable in two ways - 1) any metal ( ductwork, pipes )
>within the field of the loop will distort its directionality; 2) the
>ability to receive longer distance signals ( near the long end of the
>distance prescribed for 1 hop skip ) will be compromised. I have my
>shack in a full basement, entirely below grade. I estimate that I lose
>any signals coming in at an angle below about 20 degrees. What that has
>meant is that I can receive KOA here on my car radio parked in the
>garage, but not using the loop in the basement. San Antonio is about
>the most distant, reliable signal I've heard here.
>
>
> > 2. I think a 2-2.5' loop would be ideal for me size wise, can I get
> > good performance from it?
>
>*** That size would work - it will simply produce somewhat less gain
>than a 4' loop.
>
> > 3. Where can I get SIMPLE plans for a 2-2.5' loop? I need something
> > simple using just wire, wood and a varible cap.
>
>*** You'll likely have to build it.
>
> > 4. Since it would be used just for receiving, would the type of wire
> > or insulation make any difference?
>
>*** I'd recommend insulated, stranded # 12 or # 14. That's what most of
>us use.
>
>
>
>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: Hammarlund HQ-150 & 4' FET air core loop
>
>
>
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