Re: [IRCA] Loop comparisons / suggestions

[Chuck Hutton <charlesh3@xxxxxxx>]

I'm not convinced that the impedance mismatch would change enough to make a loop bigger than 20m be less effective than a 25m loop.

I wonder whether Andy factored in overload and was saying "bigger might cause urban overload problems".

But this is speculation as Wellbrook doesn't really explain the 20m limit.


Chuck


________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Nicholas Hall-Patch <nhp@xxxxxxxx>
Sent: Sunday, August 26, 2018 9:13 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Loop comparisons / suggestions

Wellbrook's documentation for the ALA100LN says "The antenna uses a 20m
circumference thin wire loop to provide optimum s/n. "   Apparently, larger
loops provide more of a mismatch to the input impedance of the amplifier,
so one doesn't get the expected additional gain from a still larger loop.
But they still work well with a variety of loop dimensions as various posts
attest.

best wishes,

Nick

On Mon, Aug 27, 2018 at 2:41 AM, R. Colin Newell <coffeecanuck@xxxxxxxxx>
wrote:

> Andy Ikin would’ve told you that a standard ALA100 is probably at its best
> at a loop of wire 20-30 feet long.
>
> Bigger is not always better with these units.
>
> Colin Newell - Victoria - B.C. CANADA -
>
> > On Aug 26, 2018, at 6:40 PM, Paul B. Walker, Jr. <
> walkerbroadcasting@xxxxxxxxx> wrote:
> >
> > I could’ve made it even larger but I wanted a cross between large size
> and
> > manageable   I could’ve done 40-50 feet long.  Who knows what I’ll decide
> > to do when I end up somewhere else
> >
> > Paul
> >
> >> On Sun, Aug 26, 2018 at 9:39 PM Volodya S <canswl@xxxxxxxxx> wrote:
> >>
> >> Excellent dimensions, Paul.  The larger the loop, the more gain you will
> >> have.  Mine are always as large as I can make it!   ....Walt
> >>
> >> On Sun, Aug 26, 2018 at 11:44 PM Paul B. Walker, Jr. <
> >> walkerbroadcasting@xxxxxxxxx> wrote:
> >>
> >>> When I land somewhere again where I have a bit of yard space (i dont
> have
> >>> hear, but did at my last place) Im reconstructing my Wellbrook ALA100LN
> >> 25
> >>> foot long by 10 foot tall valleyball net loop antenna that worked so
> well
> >>> for me.
> >>>
> >>>
> >>>
> >>> On Sun, Aug 26, 2018 at 7:42 PM R. Colin Newell <
> coffeecanuck@xxxxxxxxx>
> >>> wrote:
> >>>
> >>>> Correction: The Wellbrook ALA series is optimized for 100khz to 30
> >>> MHz.....
> >>>> not really 10 KHz - although you will hear lots of stuff < 100 KHz on
> >> it.
> >>>>
> >>>> 100% satisfied Wellbrook user.
> >>>>
> >>>> Colin Newell - Victoria - B.C. CANADA -
> >>>>
> >>>>> On Aug 26, 2018, at 7:36 AM, Russ Johnson <radiok3pi@xxxxxxxxx>
> >> wrote:
> >>>>>
> >>>>>
> >>>>> Good Morning,
> >>>>>
> >>>>> I will likely be purchasing a magnetic loop this fall.  I wasn’t able
> >>> to
> >>>> find much on the web in terms of direct comparisons between the
> >> Wellbook
> >>>> ALA1530LP,  W6LVP loop and DX Engineering RF-PRO-1B.
> >>>>>
> >>>>> Ability to withstand the weather is of prime importance.  While cost
> >> is
> >>>> always a consideration, of equal importance are performance (of
> >> course),
> >>>> durability, product support, ease of installation and use.
> >>>>>
> >>>>> I’d love to hear any thoughts, experiences and suggestions.
> >>>>>
> >>>>> Thank you ,
> >>>>>
> >>>>> Russ Johnson
> >>>>> Lexington NC
> >>>>>
> >>>>>
> >>>>> Sent from my iPad
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