Several choices then: Parallel dipole G5RV Carolina Windom
Those are three good ones that come to mind. On 5 Dec 2005 at 20:13, Brett gazdzinski wrote: > While on the subject of antennas, I wonder if anyone knows of a way > to do what I want to do. > I had a resonant 80 meter dipole above the house, the length was only > about 90 feet, so I had loading coils about 3/4 of the way out from the > center. > That worked ok for years, but the coax went bad at the feed point, and > while the antenna seemed to work ok, I had a bit of RF in the house, since > it was lengthwise over the entire house. > > I have a resonant 40 meter dipole that runs at right angles to the house, > and most of it is over the back yard, no RF in the house. > > I likely have about 90 feet there also, if I stay out of the trees. > > I would like to have one antenna that is resonant on 80 and 40 meters > without an antenna tuner, that fits in the 90 foot space. > > A trap dipole would be nice, but I have never found anything that holds up > to > AM at any but the lowest power levels. > > I normally run about 300 watts carrier on 40 and 600 watts carrier on 80. > > I made the mistake of trying one of those B+W all band folded dipoles, the > lowest > swr I could get about 4 to 1, maybe because of the close trees. > They are also only good for low power on AM. > > The next experiment was as much wire as I could fit above the house, about > 42 > feet each side, fed with open wire line for about 10 feet, then to coax. > The first test showed the swr way off, so I put the antenna tuner on, and it > > started arcing. I added another 10 feet of coax and everything seemed to > work ok, > but a lot of RF in the shack, and I bet I loose power in the coax with a > high swr. > > I don't want to have to fool with an antenna tuner when changing bands, and > would rather not use one at all. > > The best bet would be some sort of antenna where the 40 meter dipole is, but > I cant think of anything that would do what I want it to do. > > The property is in the shape of a pizza slice, the point being my back yard. > half way up the sides I have a medium size oak tree, and a 36 foot mast on > the other side > that is against the garage. > Close to the tip of the slice, I have a real nice cedar tree that is like a > mast, > a very good antenna support. > Out front, away from the crust is another medium size oak. > The 40 meter dipole runs from that to the cedar, and is up about 40 feet. > > Anyone got any ideas, other than ordering a pizza? > > Brett > N2DTS > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami
