Dear amigos:
I am trying to find an article published by CQ-DL , the German radio
magazine, about the TTFD antenna.
A good friend of mine that has worked a lot with this type of broadband
antenna, mentioned that
in that article there are several very interesting contributions to the
state of the art regarding the
TTFD.
At this moment I am getting ready to install a new TTFD that is 15
meters long and with a separation
of 50 centimeters between the upper and lower wire. The terminating
resistor is made from
a bundle of 2 Watt carbon resistors in parallel that will provide a
total resistance of 450 ohms
at about 20 Watts dissipation, and I will be using a 9 to 1 balun.
This antenna will also be used to experiment with resistors of 300, 600,
800 and 900 ohms
and different balun ratios...
My good friend CO2DC Jesus, advocates for a 6 to 1 balun and using a
350 to 390 terminating
resistor, with an overall length of 20 meters and a 50 centimeters
separation between upper
and lower wires. He assures me that the antenna behaves very well , with
a below 2 to 1 SWR
between 3.5 and 29 mHz.
If you happen to have any other articles about the TTFD ( not the Cebik
ones that I already have )
please contact me to coordinate how to obtain them...
73 and DX
Arnie Coro
CO2KK
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