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Old April 25th 05, 05:46 AM
Roy Lewallen
 
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Buck wrote:

Yes, I believe it has four major lobes and a few minor lobes as well.
None are exactly perpendicular to the wire (IIRC).


At 3/2 wavelengths, there are lobes perpendicular to the wire, but
they're down around 4 dB relative to the maximum lobes.

You got me on this one. I haven't looked into the 'V-Beams'. I was
thinking they were 1/2 wave dipoles. TV antennas are also a form or
Log-Periodic aren't they?


The 3/2 wave antenna bent into a "V" with 120 degree included angle is a
form of the "V beam", similar to half a rhombic. As the antenna gets
longer, the angle of the "V" has to get more acute to make the lobes
align. You can use the "V" shaped elements to make a Yagi, log periodic,
or other array. TV antennas are often a combination of those two.

. . .
I realize that the antenna will have nulls and lobes. If possible, I
would want to arrange the antenna in such a way as to use the lobes to
my benefit. Primarily, it is an experimental antenna as much for the
fun of building it as for using it.


Nothing at all wrong with that. It'll be both fun and educational. You'd
also have fun with an antenna modeling program, which would let you see
the kinds of patterns you'll get.

. . .


Roy Lewallen, W7EL
 
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