Thank you! Ed
> On Sep 23, 2018, at 6:22 AM, <[email protected]> > <[email protected]> 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: [email protected] > 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 <[email protected]> > 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 >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
