|[AMRadio] Valiant and Loop progress|
bcarling at cfl.rr.com
Mon Dec 5 20:21:59 EST 2005
Several choices then:
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
> 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
> 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
> 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
> 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
> 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?
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