TIP: Click on subject to list as thread! ANSI
echo: ham_tech
to: IVY IVERSON
from: JEFF EDMONSON
date: 1997-09-27 06:19:00
subject: High Gain Antennas for 2M

 >  JE> For example, would
 >  JE> there need to be a shorting bar across the resonant point of the "J"
 >  JE> connection for the  directors?
 > That's an interesting question.  Perhaps a 50 Ohm resistor?  (Like
 > terminating a rhombic - the terminating resister has to absorb one
 > half of the transmitted power, but it's presence controls
 > the directional characteristics of the antenna.)
Now, just where are you going to find a 750 watt, 50 ohm resistor?  };->
 > OTOH, say if you are using 2-element colinear 5/8 wave J-poles in
 > an array, wouldn't simple 5/8 wave elements, (insulated?), + 5% for
 > reflectors, and - 5% for directors be effective?
Probably, and as you said, it might look better, than all the J-pole 
assemblies up there, but you just -never- know until you try, right?
And, if it DOESN'T work, you've got some extra J-poles to give/sell to other 
hams there in the area, or Driven Elements for later Beam Projects ;-)
 > It would be interesting to see what kind of insulators would
 > be used between elements if it's a horizontal array!
 > (Don't say, "Wooden dowls!")   :-}
Fiberglass Dowels? };->
73/88
-Jeff KA5THB
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