[TowerTalk] What kind of antenna is this?

[Lux, Jim]

On 5/23/22 12:13 PM, Kevin Zembower via TowerTalk wrote:
> Well, I think we're heading in the right direction, but the one in the
> Wikipedia picture just has two wires between the end spreaders, and the
> one I saw had five. Also, the one in the picture seems to have something
> in the middle of it, and the one I saw didn't.
>
> Another thing, the antenna I saw seemed to be part of one of the
> (multi-band) hex-beam antennas. It didn't have an obvious feed-point; it
> just formed one of the hex sides of the (single band) hex-beam. The
> other multi-band hex-beam band antennas didn't have this antenna attached.
>
> Here's another illustration. It could have appeared in the legs labeled
> 1 or 2, or even could have been in the reflector legs, I guess, but that
> seems improvable. Picture at
> https://www.dropbox.com/s/1xk0rbc6a79g2zb/IMG_20220523_150816134.jpg?dl=0
>
> -Kevin


You didn't show a feed point, so if it's "standalone" or "end fed" it 
might be a way to make a synthetic "large diameter conductor" which 
improves bandwidth.

The old style MF or LF antenna (like on the RKO logo) would have a top 
hat that looked like this, fed either in the middle, or on one of the 
towers.  In which case the multiple conductors serve to increase the 
capacitance and area of the "topload".


There are people making 3 wire T2FD's as well, as a sort of folded 
dipole configuration, fed in the middle of the middle wire.



>
> On 5/23/22 14:55, Al Kozakiewicz wrote:
>> https://en.wikipedia.org/wiki/T2FD_antenna ?
>>
>> -----Original Message-----
>> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Kevin Zembower via TowerTalk
>> Sent: Monday, May 23, 2022 2:54 PM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] Fwd: What kind of antenna is this?
>>
>> There's a drawing at
>>
>> https://www.dropbox.com/s/8omfop6trejx211/IMG_20220523_144427650_BURST000_COVER.jpg?dl=0
>>
>> despite my very limited artistic talent.
>>
>> -Kevin
>> KC3KZ
>>
>>
>>
>> -------- Forwarded Message --------
>> Subject: What kind of antenna is this?
>> Date: Mon, 23 May 2022 12:22:01 -0400
>> From: Kevin Zembower <kevin at zembower.org>
>> To: towertalk at contesting.com
>>
>> Hello, all,
>>
>> At Hamvention, I saw a couple of antennas that seemed to be part of a multi-band hex-beam. They consisted of two rings about 2 inches in diameter, separated by about 3 feet, with 5 parallel wires between them.
>> On closer inspection, it seemed like a single wire double back and forth between the rings. I've also seen a similar arrangement on Naval ships, albeit much larger. They're mounted horizontally and seem to be fed from either end. The literature on the sales table might have referred to this as a 'Short 40.' The table was busy, and I didn't get to talk with the sales representative about it.
>>
>> Can anyone tell me the type or name of this antenna? Can it be modeled with NEC? What are it's characteristics, advantages and disadvantages?
>>
>> Thanks so much. Looking forward to learning more.
>>
>> -Kevin
>> KC3KZ
>>
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