Dick Carroll wrote in message ...
Brian Kelly wrote:

Mike Coslo wrote in message ...
Kim W5TIT wrote:

Newp, sorry. A 40M 1/4-wave dipole can be made to resonate just fine and
work wonderfully. Its position to the ground and center angle have
everything to do with how well it will radiate. And, using a balun or not
doesn't change the whole concept of using a 1/4-wave dipole at any
frequency.

Whether you want them to or not, they work.

A couple points here Kim.

According to the ARRL handbook 2003 edition, chapte 20 page 4:

A fundamental form of antenna is a wire whose length is half the
transmitting wavelength. It is the unit from which many more complex
forms of antennas are constructed and is known as a dipole antenna.

It goes on from there if you want more.

Next I modeled two antennas in EZNEC.

One is a half wave dipole for the middle of the 40 meter band at 7.150
mHz. Each leg of the antenna is approximately 1/4 wavelength long at
65.45 feet. This antenna models out at an SWR of a little over 1.5:1 at
the center frequency, and 2:1 at 7.3 mHz and a touch over 2 mHz at 7 mHz
with the antenna at 50 feet, the take off angle is 35 degrees. All in
all, not too bad an antenna. Most modern rigs will handle the antenna
without a tuner, or simply with their internal tuner.

Next, I modeled a quarter wave dipole for the same frequency and all
other paramaters. With the legs at 32.7 feet, the antenna now displays
somewhat near infinite SWR. The take off angle has now risen to 54 degrees.

Don't confuse her with Novice physics Mike, she's never had physics
and doesn't know a NEC deck from a sun deck.


It's even worse. She has no idea how to break a sine wave down into its components, nor
anything about the 360 degrees involved.

Don't bring up degrees, it's a sore point for her.

To say nothing about how voltage/current/impedance
values appear at each point on the waveform when it is expressed as a dipole antenna, and how
they interrelate. NOTHING about electrical wavelength versus linear measurement, or what that
even means..

.. . . I wonder how she'd tweak the length of her "quarter wave" dipole
if ya tossed her the free-space length equation and told her to crank
in the Vf term for a specific radiator material . .

All that is really quite simple and can be easily learned and understood with no help from
NEC. It's antenna basics.

Right: We were both Novices back when newbies had KNOW somthing about
antennas.

But with the testing requirements now in place, it won't be.

**OBVIOUSLY!**

I dunno who it was who made the comment in this thread but he's right,
the more "quarter wave dipoles" these refugees from 27 Mhz use the
less QRM we have to deal with.

That antenna is simply not going to work well at all.

Until she figures out how to match her 50 ohm transiciever output to several thousand ohms or
more.

But.....she isn't actually *using* a 1/4 wave dipole - she just thinks she is.
In fact she's sure of it. She said so.

Along these lines . . Field Day a few years back and one of the
codeless village idiots had put up some tribander or another which I
was using on 20 CW. I pointed it just south of due west from here in
Philly. To check things out I quickly worked a couple Euros, an OA, a
VK and a JA. Without touching the rotator control box.

I put the 259B to it and the SWR was flat at about 1.7:1 from 13.5 to
14.5 Mhz. I asked him what the hell kinda "beam" this crapper was.

"Well, it's not a CW antenna, it's tuned for the phone bands . . ".

I figger that pile of aluminum tubing at the high end of the coax was
acting as a top hat for the gawdawful lossy feedline which was doing
all the radiating.

Then came his buddy, another one, who stated that the reason g5rv's
"work" is because they're "trap antennas". I asked him to show me the
traps in the 40M g5rv we'd put up. "I don't know where they are but
they have to be there somewhere."

N2EY was there too . .

And neither of us have been back to run FD with that pack of 21st
Century nitwits.

w3rv