Dave,
They are used by a greater number than just state. The military,
all, are using HF ALE. It's used because, you are correct about
operators, a link can be set up by just IDing with whom you wish to
talk. The radios run up and down the spectrum until they find each other
and can make a solid linkup. No antenna is flat across that much
spectrum, so in recent times, the T2FD has been employed. It seems
auto-tuners don't keep up with the sounding rate from some of these
radios. It was interesting to me to see the magnificent antenna field at
Rockwell-Collins in Iowa augmented with a T2FD so that they could do
work with their ALE radios. Harris Corp. does the same.
73,
Barry
K3NDM
------ Original Message ------
From: "Dave Heil" <k...@frontiernet.net>
To: elecraft@mailman.qth.net
Sent: 8/13/2017 4:03:25 PM
Subject: Re: [Elecraft] B&W Folded Dipole over an Armory
The U.S. Department of State uses many of these B&W folded dipoles in
Africa and other nations with HF transceivers meant to be used by those
with little or no radio operations experience. All the user needs do
is consult a list of places and frequencies (which are all programmed
into memory), key the microphone and talk. These antennas weren't made
to work DX and neither were the transceivers. Any easy way to make up
for the inefficiency is to switch on one of the 500 or 1000 matching
amplifiers, none of which requires manual band switching or tuning up.
Dave K8MN
On 13-Aug-17 19:36, Fred Jensen wrote:
Ummm ... let's be truthful here. The B&W folded dipole can be found
in radio catalogs from the 50's. We all knew [I was a kid with a new
license then and even I knew] that the doohicky at the center of the
top wire was a 400 or so ohm non-inductive resistor, and half the
power [3 dB] heated it up...
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