Topband: 2 wire beverage

[Herbert Schoenbohm]

Ford,

The spacing of 15 feet should not be much of a problem.  Although I have not
modeled this termination of each wire will establish the pattern.  The
mutual coupling of the wires may cause some pattern distortion but for a low
noise 160 meter RX antenna it might be negligible.  You could always check
this with signal levels from the favored and un-favored direction and also
noise floor levels as you test the antennas. I don't believe that grounding
the unused antenna would be the way to go. If both wires are the same length
it might me easier to open one wire up in the middle with a relay.  At least
you would get some idea if the interaction was a cause for concern this way.

I think the simple approach of two separate wires favoring two different
directions is much easier to construct, replace and maintain than the
elaborate two wire system you were looking at earlier.  Remember the common
ground rods at either end could be used if you allow for the random pickup
the interconnecting  ground wire to rod length.  I presume you could put the
ground system about half way between the two wires but a separate ground rod
for each wire would most likely be the better way to go.

Good Luck and 73


HerbSchoenbohm, KV4FZ



----- Original Message -----
From: "Ford Peterson" <ford at cmgate.com>
To: <topband at contesting.com>
Sent: Wednesday, August 25, 2004 12:28 AM
Subject: Re: Topband: 2 wire beverage


> OK, so maybe a two wire switchable may not be the way to go.  How  about
> placing them  parallel about 15 feet apart...one facing northwest,  and
one facing
> southeast?  Any interaction?  Any need to ground  one when the other is
being
> used?
>
> Bill  K4XS

I don't think I have a problem with the two wire switchable arrangement.
The only trouble with them that I can see is the complexity.  Your mileage
may vary depending on your conditions.  If you build them correctly, they
will play.

As far as placement, I used the only spot on the property that it will fit.
Even 290' bevs don't work well due to buildings, antennas, roads, etc.

Ford-N0FP
ford at cmgate.com




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