-=> On 10-03-97  09:10, Roy Witt said to Ivy Iverson,<=-
-=>"About High Gain Antennas for 2M...,"<=-
-=> 03 Oct 97 00:59, Ivy Iverson wrote to Roy Witt:
 
 RW> Hello Ivy.
 
Hi, Roy;
 
 II>> Ah yes, the good old corner reflector... Now if you were to
 II>> replace the dipole elements with a 5/8 J-pole and
 II>> suitably-sized elements, mount them vertically on a boom,
 II>> (about 6-8 Ft long?), I wonder what ERP you would get with
 II>> about 40 Watts at the antenna, (50W xmtr)? ...
 
 RW>>> Build it correctly.  Mount it behind the reflector...This is
 RW>>> about a 7.5dbd  antenna with a much better F/B ratio than
 RW>>> you'll find in a normal Yagi.
 
That could prove interesting, especially when I'm trying to work someone
on the fringe and there's a lot of QRM coming from the opposite direction.
Though I'm a bit surprised that it isn't a lot more gain than I get from
my 6 dBd co-linear J-pole.  I get a lot of miles per watt with it.
 
 II>         (Side view)
 
 II>>             Pole/Tower leg mount....1/4 wave min
 II>>
 II>>             ×       |     |       |       |       |      |
 II>>             ×       |     |       |       |       |      |
 II>>  °°°°_______×_______|_____||______|_______|_______|______|
 II>>  °°°°       ×    / /R     DE      D       D       D      D
 II>> counter     ×  / /  |     |       |       |       |      |
 II>> weight      ×/ /    |     |       |       |       |      |
 II>>             ×/
 II>              ×  Why not a brace instead of a counterweight, (except
   >                 for the bending strain on the mast)?  I can see the
   >                 need for a "sail" to counteract torque caused by
   >                 wind loading, however.
 
And wouldn't the mast act as a long reflector?  OR is it TOO long?  (I
don't know how resonance works in a reflector, only that it is 5% longer
than the DE).
 
73 DE KB9QPM
   Ivy
 
 
 
... Need more bandwidth?  Use a laser!
 
   --
 
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          |---------------> Ivy Iverson, KB9QPM <--------------|
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