[Elecraft] EH Antenna Patent

Wed Feb 26 13:54:02 2003

Andy, I suspect that it would be at least as difficult, if not much more so,
to make valid field tests at VHF/UHF than at HF.

Controlling reflections is a major problem on any range and these frequently
are more difficult to handle at VHF and up than on HF.

The EH antenna itself becomes much smaller at VHF and then such matters as a
feedline not scaled in the same manner as the antenna enters into the
picture, etc. etc. Assuring adequate feedline decoupling to isolate measured
results to the antenna alone is a major issue at VHF.

The EH inventor Ted Hart recognized these issues by doing his initial field
testing at AM broadcast-band frequencies with very large antennas.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Wallace, Andy
Sent: Wednesday, February 26, 2003 11:56 AM
To: [email protected]
Subject: RE: [Elecraft] EH Antenna Patent

> -----Original Message-----
> From: Larry Weaver [mailto:[email protected]]
>
> Such a comparison was done at 14.1 MHz by the HF Pack group
> on antennas suitable for backpacking

What I don't understand is why don't people run tests on these
EH antennas at VHF? Sure, few people have room for full size
HF antennas to compare, but if these things really work
as they say, then it should be possible to scale them up to
6M or 2M and set up in a field with a 6M or 2M dipole, which
anyone has room for, and field strength measurements can be
taken at multiple wavelengths away. The wavelength-above-ground
height could be easily varied, also.

Andy