-=> On 09-28-97  19:45, Ray Brown Kb0stn said to Ivy Iverson,<=-
-=>"About High Gain Antennas fo...,"<=-
 
Hi, Ray;
 
 RW>           o
 RW>          /          top view
 RW>         o------o-------o-------o-------o------o
 RW>          \    DE
 RW>           o
 
 II> Ah yes, the good old corner reflector... Now if you were to replace the
 II> dipole elements with a 5/8 J-pole and suitably-sized elements, mount
 II> them vertically on a boom, (about 6-8 Ft long?), I wonder what ERP you
 II> would get with about 40 Watts at the antenna, (50W xmtr)? ...Hmmm....
...
 
 II> ...  Comments?
 
 RBK> Someone has come up with this, it's nick-named the J-Beam.
 RBK> Construct a good copper-pipe-based j-pole antenna, then, with a
 RBK> plastic  crossbar, attach your 3 directors and one reflector on it,
 RBK> just as a  conventional yagi beam. Don't have the precise dimensions
 RBK> here, but the  suggestion was, on the reflector, to space it at 0.20
 RBK> wavelength back instead  of 0.15 from the driven 3/4 wave j-pole
 RBK> element. Something about this giving  it a slightly less signal
 RBK> strength straight ahead, and slightly more broader  signal width. I
 RBK> moved 3 months ago, and I don't know precisely where this  article is,
 RBK> but that's what'cha need to consider, a J-Beam. 
 
 RBK> P.S. No, I don't recall the dB gain, either, but it's a bit more
 RBK> than a  5-element yagi by itself, because of the +/- 3 dB gain of the
 RBK> j-pole. 
 
Very interesting!  Thanks for the info.
 
Actually, at one time or another, SOMEONE has probably tried just about
every possible variation of every well-known antenna, almost every
immaginable antenna, and probably a few unimaginable antennas as well. 
The problem is that there is no way to know what has been tried and what
hasn't, except for those versions that have been published in various
places, (like QST, 73, the ARRL Antenna Book series, etc.).
 
73 ES TNX DE KB9QPM
   Ivy
 
 
 
... Antenna... Isn't that Uncle Harry's wife?
 
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