chuck wrote in news:1174053226_6783
@sp6iad.superfeed.net:

If the short antenna is matched (i.e., you use a tuner) it will be
nearly as efficient as its longer counterpart. A short vertical antenna
has very HIGH current at its base. Any loss in efficiency is due almost
exclusively to the tuner when operated over seawater. Over land, ground
losses become a more significant factor in reducing efficiency.



Any antenna shorter than 1/4 wavelength has HIGHER impedance and LESS
current. It NEVER has high current at its base. It also suffers from
having so poor an H-field generated without that big current lobe.

A shortened antenna is NEVER anywhere near as efficient as a full 1/4
wave radiator....or more...working against a ground system. Boy, would
AM broadcasters love to have an efficient 50' antenna tower. You'll be
FILTHY RICH if you can make that work!...(c;

If you think running your HF tuner is efficient, you are sadly mistaken.
That tuner is simply a big dummy load on a short whip. It sucks!



Larry
--
Roll up to the long checkout line....
Yell, "ICE RAID!"
It's your turn to load the grocery belt...(c;

Howdy:
Some might be interested in a small, fairly new type of antenna that could be made cheaply, but does take some
effort to tune, but once tuned, you have a small antenna that will work on the lower bands.

The EH Antenna was introduced as small dipole making use of the controversial Crossed Field Theory. One of the conditions for this
mode of radiation is to arrange the magnetic (H) field in phase with the Electric (E) field. The original theory provided by the
inventor was based on feeding the antenna through a 90 degree phase shift network which he claimed shifted the current fed into the
antenna by 90 degrees relative to the voltage across it.


Plans for 40 meter EH antenna:
http://www.qsl.net/vk5br/EHAntenna20_40.htm

80 meter EH antenna:
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=9346

Some photos of EH antennas:
http://images.google.com/images?hl=e...Images &gbv=2


--

SeeYaa Harbin Osteen KG6URO

When American Citizens with dual citizenship pledges allegiance
to the flag, to which flag do they pledge allegiance too?

-

"Harbin Osteen" wrote in
:

controversial Crossed Field Theory

Oh, ok...Is it made out of lawn furniture like the Gap antennas that
suck?...(c;

We have a ham in town who is a car mechanic. Someone convinced him if
you put this capacitor in series with his 160M long wire it would make a
super antenna. The poor sap bought it, hook, line and sinker and has
built many versions, to my amusement.

I added a second Texas Bugcatcher center loading coil to my 15' mobile
monster with the 4' across capacitor hat on the trailer hitch of my old
Mercedes 220D, the finest HF mobile car ever built....no electronics
noise. It was about 10PM and I was on 160M around 1850 Khz when I heard
this guy talking to some of his buddies over in MS and New Orleans. I
fired up the modified 650W output Tentec Hercules II and said hello.

One of his buddies, or maybe former buddies now, said, "Bob! That mobile
in Charleston is 20 dB LOUDER than you are!" Bob never made another
transmission....(c;

I love to play with antennas. I always have....

Larry
--
Roll up to the long checkout line....
Yell, "ICE RAID!"
It's your turn to load the grocery belt...(c;