[Antennas] 80m Delta Loop (s)

[Christopher Boone]

Ran a 80m Delta Loop back in the mid 90s...originally started as a 160m 
halfwave dipole....mounted about 125ft up a 250ft microwave tower...
later, I took the ends and tied them together and made it a Delta Loop 
still fed at the top with 75ohm coax...WORKED like a champ on 
80-10m..worse SWR was on 40 as predicted (3:1 at worse!)...
I DID think about tying two together....since the Fullwave Loop is 
100ohm, why not two and make it 50ohms....have one side common to both 
and feed both antennas at the bottom middle..or top middle...
since a vertical loop is bidirectional through the plane, having two 
SHOULD make it omni......should look like this (but one half folded back 
90 degrees):

(tie a and c and feed a+c
from center and b from shield)  a b c
                                 / | \
                                /  |  \
                               /   |   \
                               ---------

Yes, noise is MUCH lower on loops than dipoles on 80, etc.....
Too bad I took this antenna down (used Cat 5 wiring left over from 
massive rewiring job :)

Chris
WB5ITT

Paul B. Peters, VE7AVV wrote:

> I wonder if anyone is using a delta loop or perhaps a 2el delta loop
> wire beam for 80m DX? 
> 
> In the next few weeks I hope to begin construction of a 2el 80m delta
> loop. It will be suspended between two tress by a rope catenary line at
> about 95 feet. My plan is to space the reflector element a quarter wave
> from the driven element -- although I have 102 feet between the trees
> and could squeeze a director element into the mix by tightening up the
> spacing. 
> 
> At present I'm using a two dipoles at right angles to one another so I
> can switch between long path EU and JA. The dipoles are at 105' and seem
> to play very well, but I'm hoping the relative signal to noise level
> might be less on the loops. Like everything related to antenna building,
> you never know until you try something. 
> 
> At this point I'm looking for ideas on the delta loop project -- both
> pro and con for this project.
> 
> 73 de Paul, VE7AVV

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