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Author Topic: Antenna ID?  (Read 3659 times)
AF6WI
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« on: April 01, 2011, 03:27:08 PM »

My wife took a photo of this antenna:
http://www.flickr.com/photos/civex/5580781130/
and neither of us can tell what it's for. It's in an area that appears abandoned, with no signs indicating its former use.

Any clues?
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W5FYI
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« Reply #1 on: April 01, 2011, 05:38:29 PM »

It's hard for these old eyes to tell, but it looks like a discone, a wideband monopole vertical. Used for transmitting and receiving over wide frequency excursions, typically used by military and government stations.
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KE3WD
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« Reply #2 on: April 01, 2011, 06:17:51 PM »

I doubt it would be a Discone. 

Perhaps it may be a Sterba Curtain with a unique mounting/hanging method using a tower and a boom suspended from cables.  If that is the case, all the wires above the boom are likely not active, they would merely be supporting the boom and the Curtain array wires are underneath.   


73
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N3OX
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« Reply #3 on: April 01, 2011, 07:25:32 PM »

Looks an awful lot like a HF conical monopole to me... like one of these:

http://www.giangrandi.ch/electronics/broadcast/prangins-sw1-a.jpg

http://www.giangrandi.ch/electronics/broadcast/prangins.shtml

That one is apparently at a Swiss broadcaster's site.
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
AF6WI
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« Reply #4 on: April 01, 2011, 09:53:51 PM »

Louise stopped back by there today, and it's ITT World Communications, according to a beat up mailbox. She somehow dug up this web page:
http://wikimapia.org/18873/Fomer-Maritime-and-VOA-Station-KFS-KROJ
which refers to two inverted cone antennas, which I presume are this type of single-tower cone:
http://www.antenna.be/tci-550.pdf
(NOTE: triggers download of a 1MB pdf file)

So I'll be comfortable guessing it's a broadband inverted cone.

Many thanks, guys. Your suggestions helped confirm it's identity.
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AF6WI
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« Reply #5 on: April 01, 2011, 09:58:01 PM »

Oh, Denise Stoops lives around here somewhere, and she spoke to one of our ham clubs:
http://www.youtube.com/watch?v=RYhrSEERvbI
shows her in incredible action at the key of KPH, KSM, and KFS. She's incredible!
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MAGNUM257
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« Reply #6 on: April 06, 2011, 09:52:25 AM »

My wife took a photo of this antenna:
http://www.flickr.com/photos/civex/5580781130/
and neither of us can tell what it's for. It's in an area that appears abandoned, with no signs indicating its former use.

Any clues?

HEY!! That looks like our clothes line!
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KK9CQ
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« Reply #7 on: April 06, 2011, 04:54:55 PM »

I have used an antenna that looks very similar to this one for years only mine is much smaller. 23' in height and ground mounted. It works very well, for me, from 40 meters thru 6 meters.
When I first found the information on this type antenna, it was labeled as a "Conical Monopole".
Mine has two cross bars, small one at the top and longer one approximately mid way down. The information I have states some have been built that will work on 80 meters, by using a tower as a support.
Again, not exactly the same but similar. For me, it beats any other vertical I have used.
Bob
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WB7BWR
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« Reply #8 on: April 13, 2011, 07:06:49 PM »

A bit different than  the one I remember but called a discone and was used at the Titan missile sites in and around Tucson ariz years ago
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WB6BYU
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« Reply #9 on: April 13, 2011, 10:36:22 PM »

A discone has the wide part of the cone at the bottom and the point at the top, with a disk above it.

This has the point of the cone down and the wide part at the top, with additional wires that come
together at the very tip.  It is, as some others have correctly identified, a "conical monopole", basically
a vertical that widens at the top to improve the bandwidth.  (There are also "biconical" variants
that look like two cones stacked on top, so the antenna tapers out to a point about 1/3 to 2/5 of
the way up, then tapers back in from there to the top.)

They usually can cover at least a 2 : 1 range of frequencies (or more) with low SWR.
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