m II wrote:
Kees wrote:

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




http://members.home.nl/rita.kees/t2fd1.gif

I found that my garage is WAY to far away to use this setup.

Following the formula, I took an average frequency of 10 Megahertz. I
divided into 100, as per the formula. I got an antenna length of
(100ft/10,000,000) = 1 X 10^-5 feet, or 0.00012 inches.

I then thought that this just couldn't be right. I redid it using Meters
instead of feet and arrived at 0.00001 meters length. MUCH BETTER! The
problem now is that the store only sells full length rolls of wire.
Where can I mail order a smaller chunk? Can they just wrap the postage
stamp around it to save shipping costs?

Being ever on the watch for cheap alternatives, what is a cheap way of
relocating the far end antenna support?

I don't want to pay to have the garage moved.

Any insights appreciated.



mike


In physics always use meters, kilograms, joules and not inches, pounds
or horsepower

Hans

Hans wrote:

In physics always use meters, kilograms, joules and not inches, pounds
or horsepower


Of course. Sorry about my retrograde calculations, however, the numbers
provided on the site need to be clarified, as they don't work either in
either method.

An example at the bottom of the page using the proper units would be in
order. The confusion is what caused me to post to begin with.

100 anything divided by millions of other units is bound to cause very
small numbers and in this case very small numbers give birds no place to
perch.



mike

The fact that we get widely varying reports about the performance of the
T2FD antenna suggests that an equally-long dipole would give good results
across the frequency spectrum if used with an antenna tuner. What the
T2FD really buys you is the ability to avoid an antenna tuner.

There is an amateur antenna out there consisting of an 80-meter dipole
(I mean one that is a half wave at 80 meters, not one physically 80 meters
long) fed with about 100 feet of 450 ohm ladder line. It turns out that
100 feet of line is within about 10% of the idea length to match the
antenna to 50 ohms on all amateur bands. One design of this antenna uses
a tuner to correct for the mismatch, while another uses various lengths
of 450 ohm line added to the feedline to achieve a match.
--

jhhaynes at earthlink dot net