Small loop efficiency is relatively dismal, but as G8HQP once said
concerning this topic...
That would depend on what you mean by 'efficient.' Probably not efficient
in the usual engineering sense of power out vs. power in, but perhaps
'efficient' in the common meaning of being able to do the job
The AEA Isoloop (I think it is not still being made) was about 3' in
diameter and had a wide aluminum strap for a loop conductor. The loop
was WELDED to the stators of a butterfly capacitor -- that is a
capacitor made with two stator sections and a common rotor. So there was
NO sliding contact
Last post didn't go thru...trying again...
I've had good results using LMR400 (outer conductor) and an air dielectric
tuning cap which will handle the 10-15W power of a KX3. In some informal
testing comparing a 6 foot diameter loop and a 1/4 wave wire antenna (40
meters) using a car chassis as a
I have considerable experience with both commercial and home-brew loops.
As others have said, it is tough to obtain maximum efficiency - the two
largest contributors to loss being resistance in the tuning capacitor and
ground losses. A couple of wires soldered to the tabs of a receiving
capacit
Magnetic Loop is low (typically less than a few
> ohms) and it drops as you press it into service on lower frequencies. Even
> small additional
> resistances add up and become significant when compared to the radiation
> resistance on the lower bands and this is what causes the Loop
I've had good results using LMR400 (outer conductor) and an air dielectric
tuning cap which will handle the 10-15W power of a KX3. In some informal
testing comparing a 6 foot diameter loop and a 1/4 wave wire antenna (40
meters) using a car chassis as a counterpoise, the loop beat the wire by 5dB
Tried posting w/ web interfacethat didn't work, so will try
hereplease excuse dups if that occurs.
---
I've had good results using LMR400 (outer conductor) and an a
Eddie-I have both the AlexLoop and the W4OP loop and enjoy using them both in
the right situations. It takes some patience to tune but I’ve worked a fair
amount of both domestic and dx with these loops. The AlexLoop is best on 20 and
higher, and I use an inexpensive Vivitar tripod VIV-VPT-1250 a
nd,,,).
73
Frank
W3LPL
- Original Message -
From: "GRANT YOUNGMAN"
To: "Elecraft"
Sent: Saturday, April 22, 2017 5:36:33 PM
Subject: Re: [Elecraft] Experiences using a portable HF loop
A wire will not always outperform a loop. It depends among other thi
A wire will not always outperform a loop. It depends among other things on
whether or not you have a way to hang the wire at a reasonable height.
Typically useless on the beach, for example, unless you pack a pole or two to
get it up in the air, which means guys and all the rest. Doable, of c
one.
>
> 73, Ron AC7AC
>
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil
> Hystad
> Sent: Friday, April 21, 2017 7:45 PM
> To: Eddy Avila
> Cc: Elecraft
> Subject: Re: [Elecraft] Experiences using a portable HF loop
&g
>>
>Subject: Re: [Elecraft] Experiences using a portable HF loop
>Date: April 21, 2017 at 11:00:09 PM GMT-4
>To: "'Phil Hystad'" mailto:phys...@mac.com>>, "'Eddy Avila'"
>mailto:k6...@hotmail.com>>
>Cc: "'Elecraft
On 4/21/2017 9:00 PM, Ron D'Eau Claire wrote:
The very BEST magnetic loops are incredibly inefficient, yet like any
"incredibly inefficient" antenna one can make amazing contacts on them when
conditions are right.
If you use the suggestion that the loop perimeter (circumference for a
circular
lf Of Phil
Hystad
Sent: Friday, April 21, 2017 7:45 PM
To: Eddy Avila
Cc: Elecraft
Subject: Re: [Elecraft] Experiences using a portable HF loop
The May 2017 QST not only does a review of the Elecraft KX2 but it reviews
the Alpha Antenna, 10-40 meter support. This is a magnetic loop antenna and
The May 2017 QST not only does a review of the Elecraft KX2 but it reviews the
Alpha Antenna, 10-40 meter support. This is a magnetic loop antenna and I
think it retails (basic model) for $299.
73, phil, K7PEH
> On Apr 21, 2017, at 6:24 PM, Eddy Avila wrote:
>
> Greetings all, I'm curious to
I have never used one but knew someone who did, he basically said a end fed
wire out performed it.
From: Eddy Avila
To: Elecraft
Sent: Friday, April 21, 2017 9:36 PM
Subject: [Elecraft] Experiences using a portable HF loop
Greetings all, I'm curious to hear from anyone us
Greetings all, I'm curious to hear from anyone using a portable HF magnetic
loop. I've read the theory behind them so I'd like to hear your opinion about
them? How efficient these antennas are, especially running qRP.
Thanks all,
73
ed
___
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