Wow, just going through all the literature I picked up at Hamvention,
and I got lucky. I picked up a leaflet from the folks who made the
antenna I was asking about. They're RadioWavz.com and the antenna is
called the "Sentinel Hex Beam with 40 Short Add On." They don't list it
on their website separately; you have to choose it as an option for the
Sentinel Hex Beam. The picture at
https://www.radiowavz.com/product/sentinel-hex-beam/69?cp=true&sa=true&sbp=false&q=false
seems to show it, although the front-most pictured element seems to have
a cover over it. The elements on the right and left side are more like
the elements I saw.
So, it's not a stand-alone antenna, but a component of a 40M hex-beam.
I'm guessing it's only advantage is to get the wire needed for a 40M
hex-beam to fit conveniently with the hex-beam elements for the other
bands on a multi-band hex-beam antenna.
Could it be modeled? Any other advantages, disadvantages or characteristics?
Thanks for helping me understand this antenna.
-Kevin
KC3KZ
On 5/23/22 15:13, Kevin Zembower 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
>
> On 5/23/22 14:55, Al Kozakiewicz wrote:
>> https://en.wikipedia.org/wiki/T2FD_antenna ?
>>
>> -----Original Message-----
>> From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Kevin
>> Zembower via TowerTalk
>> Sent: Monday, May 23, 2022 2:54 PM
>> To: towertalk@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@zembower.org>
>> To: towertalk@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
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|
