Hello Lee,

Thanks for letting me know that by giving your magloop half-a-chance
it performs according to expectations.

You have also demonstrated that the G5RV is not so hot as it is made
out to be by salesmen and they who have never tried anything else.

No disrespect intended to G5RV himself, now deceased, who claimed only
that it had a nice radiation pattern on 14.15 MHz which enabled him to
work both Europe and North America from South America without having
to climb ladders and change anything.

The magloop is by far the most efficient of all the antennas of
roughly the same physical size. Both theoretically and in practice. It
will do even better if you can get it well above ground in the
vertical plane.

In the horizontal plane it works best at the higher heights, above
surrounding obstructions like buildings. But in such surroundings
there is room to erect full-size dipoles anyway, which will obviously
do better still.

The main disadvantage on the 160 and 80 meter bands is the size,
physical and capacitance-wise, of the variable tuning capacitor. You
need a vaccuum capacitor of about 1000 pF max. By correct choice of
loop dimensions and minimum capacitor setting the 40 meter band can
also be covered. On 40 meters a small magloop can be highly
efficient. Investigate using program MAGLOOP4.

Are you using the small internal coupling loop, about 1/5 diameter of
main loop, to match to a 50-ohm feedline? This is the best and most
simple way to go,

A different ratio small loop diameter is needed for other feedline
impedances. The circuit behaves as if the turns ratio on a
transformer is being changed.

Let us know how your experiments proceed.
----
Reg, G4FGQ.

What about a fractal magloop Reg? Should be even smaller. :)

"Reg Edwards" wrote in message
...
The magloop is by far the most efficient of all the antennas of
roughly the same physical size. Both theoretically and in practice. It
will do even better if you can get it well above ground in the
vertical plane.

What about a fractal magloop Reg? Should be even smaller. :)

This is a case of a fractal GUARANTEED to perform worse than the basic
antenna in all respects.

That is unless a simple circle can be considered to be a
zero-zero-order fractal.

"Reg Edwards" wrote in message
...
Hello Lee,

Thanks for letting me know that by giving your magloop half-a-chance
it performs according to expectations.

You have also demonstrated that the G5RV is not so hot as it is made
out to be by salesmen and they who have never tried anything else.
snip

Well, for me Reg, the halfsize G5RV was the only multi band antenna that i
could squeeze into my garden...and the bandwidth of the loading coils for 80
is below my expectations..... that`s apart from the fact the loading coils
knocked out 40...ho-hum time for a better antenna that isn`t an
eyesore...and works better as a bonus.....
On VHF, beams and quadloops are no problem for 6m even, but HF is a whole
new ballgame....had i the space, i would continue with quadloops for
HF....but!!!......(shakes head).

Are you using the small internal coupling loop, about 1/5 diameter of
main loop, to match to a 50-ohm feedline? This is the best and most
simple way to go,

No. i`m using a `gamma` match, if you can call it that....the matching loop
comes next.
Wonder if a coaxial gamma match would work as i`m a staunch
believer....(could put that principle to use for the capacitor tuning
instead of a butterfly variable......)
Can`t get on with other types of loading, too fiddly!.

Regards....

Lee...G6ZSG.......



A different ratio small loop diameter is needed for other feedline
impedances. The circuit behaves as if the turns ratio on a
transformer is being changed.

Let us know how your experiments proceed.
----
Reg, G4FGQ.