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Re: Strange Loop Antenna

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  • Greg Ella
    This is definitely the Valcom antenna shown in the link Don provided. This also explains the landscaped circular area visible in the Google satellite view, as
    Message 1 of 10 , Dec 23, 2012
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      This is definitely the Valcom antenna shown in the link Don provided. This also explains the landscaped circular area visible in the Google satellite view, as a ground screen. Probably their TIS antenna based on kugellagers' post. Thanks all for helping me solve this mystery.

      Greg Ella

      --- In loopantennas@yahoogroups.com, Don <stb55@...> wrote:
      >
      > Here is a link to a manufacturer of a like antenna:
      >
      > <http://www.valcom-guelph.com/products/V-147-CL2-TH.html>
      >
      > Don KPC6NDB
      > Upland, CA
      > 34.10 -117.63 1250ft
      > R-75 w/250Hz 2x R-71A w/250Hz R-70
      > SDR-IQ SR-AF & LPF DSP599zx
      > MFJ-784B HD-1418 AF-1 MSB-1
      > PA0RDT Mini-Whip x2 @ 15ft
      > LFL1010 ALA100L x2
      >
      > On 22-Dec-12 08:33, Greg Ella wrote:
      > > I have just created an album in the photo section and posted a photo of a strange antenna at the Denver International Airport.
      > >
      > > I initially thought that this antenna was two crossed vertical loops mounted 90 degrees to each other. A closer look shows, as can be seen in the picture, that there are only three "halves" to the loop, instead of the four "halves" that you would have with two crossed loops. The three "halves" are symmetrical, 120 degrees apart when viewed from above. I don't think that this is a single "eggbeater" element, because when you zoom all the way in you can see that the sections appear to be insulated from each other.
      > >
      > > This loop array is mounted above eight horizontal radials (only six visible in the photo). This could be a ground plane, but again, zooming in you see that each element appears to be mounted in an insulated connector. So this may be an array of horizontal crossed dipoles.
      > >
      > > I visually guesstimate that the loop is at least 3 feet in diameter, and that each horizontal element is at least 12 feet long. It could be larger. It is mounted on top of a tall mast (at least 50 ft high), with no reference points to compare it to.
      > >
      > > This antenna is located along the main entrance road to the airport. It is all by itself, well away from the tower, terminal, runways or any other antennas or structures. There is a landscaped rock area around the base of the mast, but no building or equipment shed.
      > >
      > > I am a private pilot and am familiar with various antenna systems for VOR, ILS, NDB, voice comms, etc. I have never seen such an antenna before. It definitely appears to be of high quality commercial construction. This really has my curiosity going. Any information would be greatly appreciated.
      > >
      > > Thanks,
      > >
      > > Greg Ella
      > >
      > >
      > >
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