Topband: Inv L in Tree

[Edward]

Thank you!

Ed

> On Sep 23, 2018, at 6:22 AM, <chris at profile-technology.com> <chris at profile-technology.com> wrote:
> 
> Hi Guy and Ed
> 
> STEALTH 80 METER ANTENNA
> 
> Just read your emails ref antenna wires in trees which I found interesting.
> 
> For some 14 years I was able to use an overhanging branch in a Scots pine in the land behind my garden (yard) to support both 160 meter and 80 meter systems at some 80 feet.  When the land was sold recently the situation changed and I m now using a 50 foot Holly tree to provide for an 80 meter vertical.
> 
> My method has been to use a 40 foot fibre glass pole (mine is from from 'Spiderbeams' but any would work), I run a 66 foot wire into the pole with the remainder trailing from the larger end.  I use a pulley system comprising thin marine line, pulleys and a small winch (driven by golf cart battery) relay controlled from the shack to raise the pole THROUGH the Holly tree so as to be a full quarter wave 80 meter vertical.  The antenna is only raised to full height when required i.e. mainly from just before sunset to just after so covering grey line and night periods.  I also use a FCP system as I have found this much more effective and easy to resonate than a mediocre radial system.
> 
> Even though the main radiating portion is within the tree this set up out performs, on DX, a low level sloped loop and works reasonably without being raised to full height.
> 
> I have found over some 45 years of holding a transmitting license that all you can do is your best and as Guy says 'muse and invent'.
> 
> Hope this note provides some ideas.
> 
> Best regards to you both and the Reflector group.
> 
> Chris G4BGM
> 
> 
> 
> 
> 
> -----Original Message----- From: Guy Olinger K2AV
> Sent: Sunday, September 23, 2018 11:06 AM
> To: navydude1962 at yahoo.com
> Cc: TopBand List
> Subject: Re: Topband: Inv L in Tree
> 
> Hi, Ed,
> 
> Taking the vertical wire up next to the tree trunk will be fairly lossy.
> That usually also means that some part of the horizontal wire is going
> through the tree canopy, which will be further lossy. See k2av.com . Click
> on the green index button "Place an Inverted L". Also read "Design an
> Inverted L", "Place an FCP" and "The Loss List". Note the issue with not
> having trees (or parts of them) "inside the bend" of the L. Read them all
> with an eye to understanding the loss issues.
> 
> There certainly are situations where a variety of local constraints will
> make the most efficient method otherwise inadvisable, e.g. wire in
> neighbor's tree not being seen. :>))  Oh, what an enormous advantage are
> great relations with the neighbors!
> 
> But, while you are the only one who really knows what you can and can't get
> away with, if you know what causes RF loss in an antenna, then you are also
> the only one who can muse on the problem for a while and invent a variation
> in the arrangement that stays within your local restraints **and** avoids
> most or all of the loss.
> 
> Let me know off-reflector if you want to discuss this over the phone. That
> is sometimes a lot more direct and far less time consuming than email.
> 
> In any event, good luck with it & 73,
> 
> Guy K2AV
> 
> On Sun, Sep 23, 2018 at 1:39 AM Edward via Topband <topband at contesting.com>
> wrote:
> 
>> Has anybody snaked a wire up a tall tree trunk to make an Inv L?
>> 
>> Any interaction?  Success??  Has to be stealthy because the tree os my
>> neighbor's :-)
>> 
>> Thanks,
>> Ed NI6S
>> _________________
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>> 
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