Message-ID: <4A998168.2010402@hifidelity.com>
Date: Sat, 29 Aug 2009 19:28:40 +0000
From: Steve Dove <dsp@hifidelity.com>
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Subject: Re: LF: Tree noise
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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: g3kevmal@talktalk.net
>  >
>  > 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.