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-boun...@hard-core-dx.com> on behalf of Nicholas Hall-Patch <n...@ieee.org> 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 <coffeecan...@gmail.com> 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. < > walkerbroadcast...@gmail.com> 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 <can...@gmail.com> 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. < > >> walkerbroadcast...@gmail.com> 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 < > coffeecan...@gmail.com> > >>> 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 <radiok...@gmail.com> > >> 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 > >>>>> _______________________________________________ > >>>>> IRCA mailing list > >>>>> IRCA@hard-core-dx.com > >>>>> http://montreal.kotalampi.com/mailman/listinfo/irca IRCA Info Page - Kotalampi<http://montreal.kotalampi.com/mailman/listinfo/irca> montreal.kotalampi.com Your email address: Your name (optional): You may enter a privacy password below. 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