Topband: VE3DO Loop

[Joe Subich, W4TV]

> For anyone who wonders, the 180 degree phasing was chosen because it
> was dead easy to implement, was not fussy with respect to matching,
> and gave the highest RDF at the expense of a little F/B.

Simply ... the 180 degree phasing cancelled the high angle response
from the "loops" (the horizontal component of the bottom wires and
the sloping sides).  Think about it!

73,

    ... Joe, W4TV


On 2/15/2013 7:55 AM, Pete Smith N4ZR wrote:
> For whatever it is worth, afew years ago I put up an endfire array of
> two K9AYs spaced 135 feet, phased 180 degrees.  It worked probably the
> best of any receiving antenna I have had here on 160M.  Modeling with
> NEC2 showed an excellent RDF - whether that was achieved in real life
> only God knows.
>
> For anyone who wonders, the 180 degree phasing was chosen because it was
> dead easy to implement, was not fussy with respect to matching, and gave
> the highest RDF at the expense of a little F/B.
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
>
> On 2/14/2013 3:08 PM, K9AY wrote:
>> W8JI said:
>>
>> ...(we probably all know) elongated loops are not really loops in
>> function. They are really phased verticals, and the horizontal part or
>> component of the conductors is simply a phasing line. K9AY's, Flags,
>> Pennants, EWE's, and other forms of elongated loops are really all
>> just phased verticals in function.
>>
>> ----
>>
>> Not so. Time to put this misconception to rest.
>>
>> Read my description of K9AY Loop operation in the most recent ARRL
>> Antenna Book and review the description of a DF loop with sense
>> antenna in that, or earlier antenna books.
>>
>> I have never been able to achieve the same pattern as the loop using
>> close-spaced elements in a phased array. However, a model using a
>> small loop in combination with a nearby short vertical does indeed
>> result in the same pattern. (Feed them with equal currents and 90 deg.
>> phase shift.)
>>
>> Magnetic lines of force from an arriving wavefront MUST induce
>> currents in a loop. You can't ignore them and assume that the vertical
>> end portions are the only place energy is captured.
>>
>> 73, Gary
>> K9AY
>>
>> _________________
>> Topband Reflector
>>
>
> _________________
> Topband Reflector
>