[Elecraft] E-H Antenna Simulation in NEC

[Heimo J. Lyden]

John, thank you for taking your time to make a NEC analyzis. This conforms 
very well to experiments made by a friend of mine, Bengt SM6APQ, when he 
was asked by the swedish SSA magazine QTC to perform some tests on the EH 
antenna. Bengt is a QRO guy and this is probably the only time he used QRPp 
:-). I really would love to have a miniscule tube in my tiny garden that 
works as well as a dipole, but I think I will stick to my fishing pole 
vertical and some wire antennas for the time being.
�
These were his findings (translated from swedish).
QUOTE
I made two serious experiments with a so called EH-antenna.
The first one was to connect the antenna to a 10 meter long 450 ladderline 
with a balanced tuner by the transmitter. I received descent reports from 
Poland and Germany on 7 MHz and the same reports with the eh-antenna 
disconnected, which makes me beleive that it was the 10m long ladderline 
that did the radiation.
Next experiment was to attach a small battery supplied chrystal transmitter 
on 7Mhz in an aluminium box. Output power was only a few mW. At first I 
hoisted the tx connected at the feeding point of a 2x10m dipole antenna. I 
could hear the signal on a multiband antenna about 40 meters away with a 
signal strength of about 70dB over s-9. Staffan SM6DOI, 10 km north of my 
QTH gave me a S-1 report. After that I took down the dipole and replaced it 
with the two aluminium cans. Now I could hardly hear the signal on the 
multiband antenna. No deflection on the S-meter. If there had been S-1 it 
would mean that it was 118dB (6x8+70) weaker than if the reference dipole 
was used as a transmitting antenna. SM6DOI could not hear the tx when I 
used the eh-antenna.
UNQUOTE
�
> Just for fun, I ran the E-H Antenna described in the patent 6,486,846 in
> NEC-4.1.
�
73
Heimo FG/SM6LOD