[Lowfer] Tree Experience

Warren K2ORS k2ors at verizon.net
Fri Dec 27 15:49:51 EST 2013


Jay, John,

       I thought that Bill Ashlock's tree antenna was a random wire 
supported by a tree and fed with a 9:1 or 16:1 transformer?
This was his setup in Ellsworth,NH in any event...


73 Warren


On 12/27/2013 3:23 PM, jrusgrove at comcast.net wrote:
> IIRC, Bill Ashlock was using a 'Tree Antenna' for receiving lowfer
> stations many years back. Seemed like he got decent reception.
>
> Jay
>
>
>
>
> ----- Original Message ----- From: "JD" <listread at lwca.org>
> To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands"
> <lowfer at mailman.qth.net>
> Sent: Friday, December 27, 2013 3:10 PM
> Subject: Re: [Lowfer] Tree Experience
>
>
>>>>> or is the relatively strong signal from the 50KW station also
>>>>> creating some level of   "ionic" non-linear conductivity process
>>>>> within in the tree(s)---which then a portion thereof is re-radiated
>>>>> or otherwise coupled to the e-probe?
>>
>> A much simpler explanation may involve the height of the trees.
>>
>> Although trees are highly resistive "antenna elements" by nature, they
>> are still subject to resonance effects.  Their relatively large
>> diameter and their inherent capacitive loading mean that most any full
>> grown tree can have a substantially different amount of interaction
>> with a 2040 kHz EM wave than it does at 1020 kHz.  Not only the height
>> of their trees, but also the spacing, will directly affect the
>> relative levels of carrier versus harmonic at any given point, since
>> they can form a low-efficiency directional array of sorts.
>>
>> I was able to witness this effect first-hand at an AM station a little
>> over 20 years ago, while trying to show the owners why they needed to
>> deforest (no pun intended) the site to its early-1950s condition if
>> they wanted the same coverage they had back when the station was new.
>>
>> John
>> ______________________________________________________________


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