Hello, Don, Dave, et al,
Don said The only problem with that is the high voltage point on a fullwave
loop is electrically opposite the feedpoint, not 1/4 wave away from the
feedpoint.
Not so. Here's why...
Define a quad, full wave loop, as a square -- geometrically equal lengths on
all sides.
Dave (and Don),
Not a silly question, Dave, what so ever.
My suggestion was to open it up 90 degrees from the present feed-point, 1/4
way around...this being a voltage maximum (loop) and current minimum (node).
This enables the loop to still act like a loop on 80, if you desire to
maintain
Rick,
The only problem with that is the high voltage point on a fullwave loop is
electriclly opposite the feedpoint, not 1/4 wave away from the feedpoint.
It is true that opening it at the 80 meter 1/4 wave point would create an
off-center fed 160 meter dipole that has been bent back on itself,
Jim and the group,
At every field day, our club W5KA uses 80 M Inverted Double Extended Zepp
element wire doublets.
We have had up to 250 feet of two types of window line, and with the large
Dentron tuner, we have a low loss match, and it works every signal we hear.
That is on multiple bands
Regarding open wire line, I generally use something in the vicinity of 450
ohms. That is an easy size to buy or fabricate and produces a fairly low SWR
when used to feed most doublets. While open wire lines are low-loss, they
are not lossless. SWR does matter, just no where near as much as when
In a message dated 2/21/07 4:59:24 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
our club W5KA uses 80 M Inverted Double Extended Zepp
element wire doublets.
If my math is right, that works out to about 330-340 feet of wire,
center-fed!
We have had up to 250 feet of two types
Why not put up a Windom, which is an off-center fed dipole? It does require
a 4:1 balun, but it is coax fed and works very well on both odd and even
harmonics. I use two 40 meter Windoms, crossed for complementary coverage
and fed separately. They work well on all bands (even 80 in a pinch)
Even simpler is a 80m dipole fed with balanced line to a tuner for all band
use. The window line is less costly than coax. A good quality tuner is
less lossy in multiband use than coax/ tuner balun, etc.. Balanced antennas
have fewer problems than off center feeds. Balanced line to dipole does
On February 20, 2007 02:17 pm, rohre wrote:
Even simpler is a 80m dipole fed with balanced line to a tuner for all band
use.
Perhaps simpler, but not necessarily a good solution.
The window line is less costly than coax.
Usually.
A good quality tuner is
less lossy in multiband use than
In a message dated 2/20/07 5:18:23 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
Even simpler is a 80m dipole fed with balanced line to a tuner for all band
use. The window line is less costly than coax. A good quality tuner is
less lossy in multiband use than coax/ tuner balun,
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