The T2FD (Terminated Tilted Folded Dipole) was developed by the US Navy
after carrying out experiments using terminating resistors. Numerous
variations have appeared over the years, usually accompanied by warnings
that as a transmitting aperiodic multiband antenna, its performance may
leave something to be desired. This is because the transmitting power may be
wasted in the terminating resistor.

As mentioned previously the antenna developed from US Naval experiments to
broaden the bandwidth of a folded dipole to a reasonable degree. The was
first described publicly in 1949, after Navy Captain C.L. Countryman tested
it for long periods in California during WWII. The T2FD (also known as a
tilted, centre fed, terminated, folded dipole) can offer claimed gains of
4-6dB over a dipole, depending on the frequency, although 1-3dB is nearer
the mark with some frequencies exhibiting 1dB, as the resistor absorbs the
RF power in transmission. The main attraction of the T2FD is not its gain
however; it's its broadbandedness. It was, and still is, being publicized
in journals as a broadband aerial suitable for use between 3.5 and 28 Mhz.
In addition the T2FD has some attractive properties in terms of noise
reduction, which some long wires / dipoles and ATU combinations are
susceptible too.

In addition the T2FD can be used at higher frequencies than its design
frequency. Some sources claim that it can be used over a range of 5 or even
6:1, although my own observations indicate 4:1. None the less a 40-meter
version will cover 7Mhz to 25 Mhz, with some useful performance up into the
27 Mhz CB band.

See http://www.gb4iom.co.uk/new_page_4.htm for more information.

73



Adrian

M1LCR

"Kees" wrote in message
...
Hello fellow shortwave listeners !

More info to make a T2FD yourself, like I did mine, please have a
look at:

http://members.home.nl/rita.kees/t2fdmake.html


I hope you can appreciate it and use it for your practice.


I will be glad to answer your questions.

73/cheers

Kees