[TowerTalk] [Bulk] Re: 80 meter wire antenna question

[Grant Saviers]

Here is one set of experiences with building phased loops 
http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/40%20Meter%20Delta%20Loop%20Array.htm

I spent a considerable modeling effort for a phased pair of delta loops 
apex up for 80m hung on an 89' tower but had little success due to the 
interaction with the tower.  A 3L Bruce with a parasitic reflector 
appeared to model better suspended between trees, but I don't have the 
right trees for EU.

Grant KZ1W

On 9/21/2015 21:12 PM, Tom Osborne wrote:
> If you get some answers directly sent to you, I'd sure like to see what
> they have to say about this.  Thinking of doing something like this with a
> 40 meter delta loop.  73
> Tom W7WHY
>
>
>
> On Mon, Sep 21, 2015 at 6:25 PM, Dick Allardyce (N4RA) via TowerTalk <
> towertalk at contesting.com> wrote:
>
>> Hi all,
>>
>>
>> I need some advice about a wire antenna for 80 meters.  I have two 85'
>> towers that support a nearly-square80 meter full-wave loop broadside to EU.
>> It fits nicely, but the bottom is only about 10' off the ground.  It's fed
>> in the center of one vertical sidewith a 1/4 wave of RG/11.  It works well.
>> I'd like to hear of opinions or experience with adding awire parasitic
>> element at this low height.  Specifically, I'd like to add a half-wave wire
>> yagi element spaced about .15WL that would be switchableto 3 different
>> lengths: phone director, CW reflector or phone ref/CW dir.  I change the
>> physical size of the loop for CWor phone.  I'd like to remotely
>> switchdirection (and mode) of the resulting antenna by changing the length
>> of theyagi element.
>> Any opinion as to the usefulness of a parasitic element ofthis design with
>> the whole thing so near ground?  The yagi element will probably only be
>> about30' in the air.  I don't expect 2 elementperformance, but I don't want
>> to bother if someone already knows it would be awaste of time.
>>
>> 73
>> Dick
>> N4RA
>>
>>
>>
>>
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