Greetings all tree-loop doubters,
Lawrence is being modest: His Oklahoma signal's nickname was
"Radio America".
73
Steve W3EEE
Laurence BY3A-KL1X China wrote:
Sorry for the late reply - Im playing catch up after a weeks
lumberjacking (I kid you not) -
Im not sure I agree with you at all reference the effectiveness of loops
in trees. I certainly didnt struggle either - In fact it was so easy I
couldnt believe the results at first - Certainly "Loops in Trees (c)"
are not perfect, but Im not in the isotropic realms of perfect
illumination so I do my best with what I got.- I just flogged my Rhon 45
towers.
Looking at the derived/realized ERP/field strength figures for my
Oklahoma and Alaskan loops both with an area of around 640 sq metres -
and based on ground wave measurement in near mid and far range, I
dont believe I was losing a lot at all ("at all" in relative terms).
In the main lobe I was running around 1-3W ERP and given my
circumstances I dont think it was a poor peformer given I had
zero/nada/zilch change of putting anything up above tree height and it
will be the same at WE2XPQ.
Im a tree hugger as a matter of necessity as everything else would
become a target for the rougue weekend flyers dropping out of the sky at
my 200m away landing strip.
back to the loop
500W 137kHz Daytime Ground wave CW readable in 1.8Khz BW/IC706 was over
>650miles from a mobile and magmounted probe which I dont believe is
too shabby, and it got to ZL too, and AQC/LDO 6NM got back the other
way (Im trying not to brag, but youll see the point)
Its horses for courses and as others have pointed out earlier we havent
seen a large amount of commercial or military LF tx loop in service
designs (save for one I know of near Puerto Limon Costa Rica) - But
what I do know that given the results of Wild Bills work and real time
results of LF "Loops in Trees (c)" that the military are taking another
look at what can be achieved and thats all down to experimentation by
all this mob and our Colonial friends. And what fun too - talk about a
steep learning curve dealing with >50amps of antennae current!
Regards
Laurence - Tianjin China
We2Xpq Wasilla AK
ps I dont think Im a serious operator but there again I have a sense of
humor too, at times.
> From: [email protected]
>
> Like I have said in the past several times I am surprised how many LF/MF
> operators have loops strung from tree branches and in amongst trees and
> claim they are perfect, especially those in the USA.
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