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Re: [loopantennas] Re: c-crane dual coil antenna?

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  • everettsharp74
    Hi Kevin, If you will look in the files section I have several articles that I have posted that will give you a lot of information on multi-coil loop antennas,
    Message 1 of 5 , Jul 5, 2013
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      Hi Kevin,
      If you will look in the files section I have several articles that I have posted that will give you a lot of information on multi-coil loop antennas, where I have made various configurations with 2 and 3 coils in parallel as well as a Pollydoroff configuration. All of the various configurations, using more that one coil have made an improvement in performance over that of a single coil. Most of the experiments were done on either a Ferrite Sleeve Loop (FSL), or on Sstacked Toroid Loop Sticks (STLS). You will find them listed under my everettsharp74 email address. However, I do not use that address as my primary address, it is everettsharp (at) aol.
      73's Everett N8CNP
      In a message dated 7/5/2013 9:42:10 A.M. Central Daylight Time, mckeetajc@... writes:


      I would much appreciate it if you would supply links to a site or two where one can learn more about Xtal set builders use of multiple air-wound coils in the same plane.




      --- In loopantennas@yahoogroups.com, kevin asato <kc6pob@...> wrote:
      > It's similar to what xtal radio developers have been using - multiple air-wound coils in the same plane to help increase sensitivity to their crystal sets. The use of the ferrite bar allows a reduction in the coil size. Difference is that the crystal sets do not fix the position of the coils to allow for fine tuning of signals. I do similar using a Terk Advantage coil with my portable radios. It works but it is not a miracle worker.
      > 73,
      > kevin
      > kc6pob
      > ________________________________
      > From: Don <stb55@...>
      > To: loopantennas@yahoogroups.com
      > Sent: Thursday, July 4, 2013 5:03 AM
      > Subject: Re: [loopantennas] c-crane dual coil antenna?
      > Hi Steve,
      > Thanks! I did not know you did that investigation. I bought one a couple
      > of years ago to hopefully improve the AM reception of my stereo in this
      > metal can. The "twin-coil" was also about half price. Anyway, it did not
      > help/improve reception in my case.
      > Don KPC6NDB
      > Upland, CA
      > 34.10 -117.63 1250ft
      > R-75 w/250Hz 2x R-71A w/250Hz R-70
      > Perseus SDR-IQ FUNcube Dongle Pro+
      > FRG-100B DX-1000 SR-AF & LPF
      > DSP599zx MFJ-784B HD-1418 AF-1
      > MSB-1 PA0RDT Mini-Whip x2 @ 20ft
      > RYO Active Antenna @ 20ft
      > LFL1010 ALA100L x2
      > On 03-Jul-13 22:36, Steve Ratzlaff wrote:
      > >
      > >
      > > This same topic came up several years ago. At that time I bought the
      > > Twin Coil antenna and tore it apart and tested it extensively on the
      > > bench. I used both the original twin coil then replaced it with a single
      > > coil. In all tests, there was no significant difference, if any
      > > differences at all, between the two configurations. And reading the
      > > patent, there are glaring errors seemingly purposely inserted to try to
      > > fool the unwary. It's a good antenna for its 7.5" ferrite rod size and
      > > works well and I recommend it if one needs a 7.5" ferrite rod remotely
      > > tunable antenna. But if you homebrew your own using a similar 7.5" rod
      > > from Amidon, and the standard single coil, you'll get the same
      > > performance. There is no magic at all in the use of "twin coils". If
      > > anything, it appeared the technician on the factory production line
      > > could more easily and quickly adjust the antenna for the proper tuning
      > > range, compared to a single coil--perhaps that's the main reason why the
      > > "twin coil" continues to be made.
      > > 73,
      > > Steve AA7U
      > >

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