[HCARC] super antenna

Fri Feb 27 10:54:49 EST 2015

Don,

I agree with you.  If the antenna is so good, everyone would be using 
it, particularly the military.  They're not, so that makes me 
suspicious.  From the takeoff angles, ground is a big factor.  I bet 6 
dB of those gain numbers come from a perfect reflection from the 
ground.  Any horizontally polarized antenna at that height and ground 
assumption would have the same takeoff angle and 6 dB gain from the 
ground reflection.  That 6 dB is probably not realistic unless your 
antenna is over a salt water marsh. It certainly isn't realistic here in 
the Texas Hill Country.

My guess is the assumption is that it is a loop antenna horizontally 
oriented.  That probably works for 160 m but it is just too large, I 
think, for that assumption at ten meters.  While at 160 it may be 
approximately omnidirectional, I bet on 10 m it will be full of minor 
and major lobes both in the horizontal and vertical plane.

In any event, it is all academic to me since I'm never going to spend 
several thousand dollars on an antenna!

Kerry

On 2/26/2015 6:06 PM, Don Murray via HCARC wrote:
> Lew...
>   
> Is this thing directional?
>   
> On 160 it certainly is lighting up the clouds!
>   
> On 80, a 29 degree takeoff angle is quite  respectable...
> but, where is the lobe??
>   
> The antenna is big, but I don't see how it is  usable.
>   
> For example... if the 40m gain is 12.4 dB at an elevation  angle of
> 15 degrees and 360 degrees of azimuth, well that would   be an
> antenna that EVERYONE with the space would  erect!!
>   
> But, if it works only in one direction, then it would be great  for a
> fixed point to point circuit, but if you want to work  different
> directions, then that is a big problem!
>   
>   
> 73
> Don
> W4WJ
>   
>   
> In a message dated 2/26/2015 3:35:18 P.M. Central Standard Time,
> w5lew at reagan.com writes:
>
> A friend  in Mississippi sent me some info about a super loop antenna.
> Thought you  might like to dream of having such and antenna.  Enjoy!
>
>
>
> A  ham's dream antenna, which I saw when visiting Bob W0JEE in Smiley, TX
> SE of  San Anrtonio.
>
> Elvin JA3CZY from Osaka came to TX for a visit. He has a  3 element 80M
> yagi at 220 ft atop a building and said that W0JEE on 75M SSB  was the loudest
> signal he ever hears form the USA, beating even the west coast  high power
> and big antenna guys. So I took Elvin to see Bob in  Smiley.
>
>
>
> Here's what Bob told me about it.
> He has  experimented with long wires, vees, rhombics and other designs.
> Then  enlisted ham friends help to design the best single antenna for all
> bands.
> There was no literature on the design they eventually came up  with.
> it is a square loop 282 feet per side square loop at 104 feet over  good
> ground.
> Wire is from http://thewireman.com/antennap.html
> #531  Toughcoat 'Silky' 13 AWG, 19 strand 40% copper-clad steel (OD
> 0.0795") with  tough, high density, low-gloss polyethylene (Nominal OD, 0.120"
> including  0.020" jacket. Designed for through-the-trees, sea coast, acid rain
> or other  inclement atmospheric conditions. Our most rugged, longest-lived,
> stranded  antenna wire for any purpose. Jacket has minimal effect on
> performance - less  than that of a year's accumulation of oxidation product on bare
> wire, with  less noise. Break strength 400lbs
> Sag is 3 feet between steel used oil  well drill pipe at corners: 3/4" wall
> 5" dia 42 feet, 4" dia 42 feet, 3" dia  42 feet nested/welded 7 ft inside
> each other with 7 feet in concrete in  ground.
> Pipe guyed in 3 directions at 120 degrees with 3/8 galv. steel  cable at 35
> and 70 feet up, 40 feet out from pipe on drill pipe posts 10 feet  above
> ground and 5 feet below in cement.
>
> Fed at the SE corner with 265  feet of Ladder line
> http://thewireman.com/antennap.html#balanced Wireman # 554
> 440 ohm, 14 AWG, 19 strand copper-clad steel, same as 552 but designed for
> maximum legal power. VF .91
>
> Bob says he got design help from Bud W5RPU  in Allen, TX who figured out
> with modeling software what would be the best  performing single antenna for
> all bands. This one performed best of  all:
>
> 160M 6.6 db max gain at 49 deg elevation / 80M 11.1 db at 29  deg
>
> 40M 12.4 db at 15 deg / 30M 13.5 db at 12 deg
>
> 20M 14.5 db at  9 deg / 17M 14.1 db at 8 deg
>
> 15M 14.6 db at 6 deg / 12M 15.1 db at 5  deg
>
> 10M 15.0 db at 4 deg / 6M 15.3 db at 3 deg
>
> Now that's some  fantastic DX antenna! Bob said he spent about $4000 on
> materials and labor  with volunteers helping. 73, Skip  W5GAI
>
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