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Old March 20th 07, 01:28 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Dec 2006
Posts: 41
Default Fan dipole..

A question for you experts out there...
I currently use a fan dipole (kind of a fan anyway)

It has 3 elements off of each side from the feed point.
A 66 foot or 132 feet total length
A 33 foot or 66 feet total length
and a 16 foot or 32 feet total length.(this is before it was tuned so
measurements are not exact)

The wires are spread 1 foot apart from each other, 18 inches from the feed
point. (where the wires are connected to the feed point, they V out from
there, to a point 18 inches from the feed point where the 1st spreader is
located, placing each wire 1 foot apart)

The wires are (hung) under each other from that point, 1 foot apart over
the total length of each wire with the longest wire (the 66/132) on top (the
33/66) in the middle and (16/32) on the bottom.

I used the longest wire to support the (pvc) spreaders for the wires
hanging under it.

The feed point is at about 40 feet with the ends of the (66/132) at about
22 feet (the ends of the shorter wires are higher, due to the fact they end
higher up the inverted V.

It has an air wound choke at the feed point fed with 50 ohm coax.

I have several questions regarding this set up.

What are the pros and cons of fan dipoles like this? I have never heard of
a fan dipole with each element being hung under each other so I have no data
to compare it to.

I would like to keep this set up when I move to my new QTH in a few months
but raise it to 60 feet or so.
I know that an inverted V is for the most part omni directional, but what
about an inverted v that is only somewhat inverted? Would that not give you
a pattern more shaped like an egg?

I really do not wish to put up a wire for each band as the one I have now
can run everything from 10m to 80m and even the low side of 160, right
around 1.8 mhz (I havent figured that one out yet)with a tuner.

What are the pros and cons of adding more wires? (other than tuneing the
wires being more of a pain)

I get very little interaction between the wires (maybe due to the fact they
are spread apart so close to the feed point) or I just got lucky, hi hi

I am looking for ideas or someone that is great with an antenna program,
that can tell me what my antenna is doing now and how to improve it at
around 60 feet at the feed point.

It looks like my shack will be up befor my new home will be ready (solar
power has its advantages) So I need to plan the antenna and the mounting
points for the ends of the wires.(angle or slope) in other words, how high
the ends need to be.

I plan on placeing the wires east / west broadside but would like a bit of
an omni pattern to reach the east coast(NY to FL) from jacksonville NC.

Sorry for the long post but I know of a few out there that can give me some
ideas that I have overlooked. It is better to plan ahead .....

Thanks
Joe
KI4ILB







 
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