-=> As Ivy Iverson was in thoughtful discussion with Jeff Edmonson <=-
 Jeff Edmonson said to Ivy Iverson,<=-
 -=>"About High Gain Antennas for 2M...,"<=-
 I> Hi, Jeff;
 
 JE> For example, would there need to be a shorting bar across the
 JE> resonant point of the "J" connection for the  directors?
 
 II> That's an interesting question.  Perhaps a 50 Ohm resistor?  (Like
 II> terminating a rhombic - the terminating resister has to absorb one
 II> half of the transmitted power, but it's presence controls
 II> the directional characteristics of the antenna.)
 JE> Now, just where are you going to find a 750 watt, 50 ohm resistor? 
 JE> };->
 II> 
 II> OTOH, say if you are using 2-element colinear 5/8 wave J-poles in
 II> an array, wouldn't simple 5/8 wave elements, (insulated?), + 5% for
 II> reflectors, and - 5% for directors be effective?
 JE> Probably, and as you said, it might look better, than all the J-pole
 JE> assemblies up there, but you just -never- know until you try, right?
 II> 
 II> A 3-element, horizontally polarized, Co-linear J-pole beam anyone?  
 II> :-? (Actually 12 active elements.)
 II> 
 II> "=" is insulators.
 II> 
 II> ----===----===O===----===----  Directors (4 insulated elements)
 II> O
 II> -----=-----|--O--|-----=----- Driven J-poles (4 elements)
 II> ~~~  O  ~~~
 II> ------=------==O==------=------ Reflector (4 insulated elements)
 II> 
 II> If each J-pole has a gain of 6dB, and the director & reflector
 II> elements are the usual 1/4 wave + and - 5%.  This should make a potent,
 II> if large, beam for 2M or above!  (Can you imagine building one for
 II> 160M?)   };-> 
 II> Question: How would the driven elements be phased?  I would think that
 II> they would be fed 180 degrees out of phase.
 II> 
 How about a twin wire or coax jpole strapped to fiberglass rods,
could be setup co-linear if the rods are long enough.
 Just a question, could you then wide spaced wrap the wire around
the fiberglass rods and possibly make the antenna physically
shorter but still resonant on the chosen frequency.
... Ivy out of coffee.....taglines may become irrational...
--- FMail 1.02
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