In article ,
says...


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

I made a nice one up a number of years ago and really wasn't impressed
with it.

Stuck with the wires.

Steve
Holland, MI
Drake R7, R8 and R8B

http://www.iserv.net/~n8kdv/dxpage.htm




A friend of mine and his son made one, and the drop in noise level was
huge. When he moved and had more room, he made a bigger one, and put
both of them up. His R8A and R8B's were awsome on them. I wish I had one
of my receivers to compare them to the day I was out there.


I wish I had the room for one, but I don't have enough room to make one
big enough to be worth all the work making it. I'll just have to settle
for my 3 medium sized Windom dipoles and one sloper. And the backup
ramdom wire in the attic.

I miss my slinky "longwire", it was awesome! It was only 5 years old
when it "died"...sniff. Gotta throw another one up when it's time to
replace one of the dipoles...

One antenna that I don't miss is the nearly worthless Sony AN1 active
antenna. That one was a stinker..and expensive.

BDK

Hello.

Just a question.

Why is the ferrite toroid near the antenna instead of near the receiver?
It is used to supress the waves received by the coax, but at the far
side from the transceiver, the supress will be minimum...

Best regards.


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

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

Cebik, W4RNL has some interesting info on his site

http://www.cebik.com/t2fd.html

73, Roger

--
Remove tilde (~) to reply

Remember the USS Liberty (AGTR-5)
http://ussliberty.org/

= = = "G.Beat" wrote in message
= = = news:UdtBc.152030$Ly.30888@attbi_s01...
"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


The Tilted Terminated Folded Dipole ("T2FD") is a broadband folded dipole
antenna design that provides a relatively
stable feed point impedance over about a five to one frequency range. The
antenna
length in meters is approximately 100 divided by the lowest desired
operating
frequency in megahertz. The upper element of the folded dipole is opened in
the
center and a non-inductive terminating resistor of around 350-400 ohms is
inserted.
The bottom element is fed in the center through a 6-to-1 balun for a good
match to
50 ohm feed line.

The antenna is not as efficient as a matched half wave dipole at any
specific
frequency, but it also does not require an antenna tuner for operation,
making it
easy to use. The loss of receiving efficiency is not generally noticeable
in the high frequency range (2-30 MHz), amounting to less than 6 db (one
standard
S-unit) during extensive on-the-air testing.

Here is additional information on the T2FD antenna.

Barker & Williamson actually applied for a US patent (US Patent #4423423)
for their specific T2FD antenna design.
http://www.fact-index.com/t/t2/t2fd_antenna.html

W9GB,

B&W makes two general statements about the T2FD:

* For example, an {T2FD} Antenna for the lower portion of
Shortwave (3 - 18 MHz) will be roughly 33m (110 feet) long,
with conductors spaced 1m (3.3 feet).
[With a Top End mounted about 60 Feet High at 30 Degrees.]

* In order to cover the higher portion of Shortwave (5 - 30 MHz),
this {T2FD} Antenna will be roughly 20m (66 feet) long,
with a spacing of 60 cm (24 inches).
[With a Top End mounted about 40 Feet High at 30 Degrees.]

Build one size or the other = No Formula Required.

Read: T2FD Antenna - WOW ! ! ! {One SWL's Experiance}
http://groups.yahoo.com/group/Shortw...na/message/293

iane ~ RHF
..
..

While this may be acceptable for SWL operation, the resistor does not have
sufficient wattage for
any station attempting to use this for a transmitting antenna.
http://www.tuberadio.com/tfd.html

http://www.universal-radio.com/catalog/sw_ant/0562.html


w9gb
..

Hi

Well, the coax receives it on the outer side.
It would travel up to the balun and goes from there into the coax
inside back to the receiver.
That's why I put it up there.

Kees


On Mon, 21 Jun 2004 12:53:59 +0200, Nacho
wrote:

Hello.

Just a question.

Why is the ferrite toroid near the antenna instead of near the receiver?
It is used to supress the waves received by the coax, but at the far
side from the transceiver, the supress will be minimum...

Best regards.


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

Hi


What are the odds ? :-)

Well I hear some successtories and non-successtories.

Mine is very low-noise; signals are low too, but I think S/N here is
very very good.

When I use a FD4 or FD3 (Fritzel) or a (long)wire, the RX is much more
"nervous". Very unpleasant listening.


73
Kees




On Sun, 20 Jun 2004 22:16:07 -0400, dxAce
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

I made a nice one up a number of years ago and really wasn't impressed
with it.

Stuck with the wires.

Steve
Holland, MI
Drake R7, R8 and R8B

http://www.iserv.net/~n8kdv/dxpage.htm

Kees wrote:

Hi

What are the odds ? :-)

Well I hear some successtories and non-successtories.

Mine is very low-noise; signals are low too, but I think S/N here is
very very good.

Mine was low noise too..., low noise, low signal... always had much, much
better results with a transformer matched wire.

When I use a FD4 or FD3 (Fritzel) or a (long)wire, the RX is much more
"nervous". Very unpleasant listening.

What exactly do you mean by 'nervous'?

Steve
Holland, MI
Drake R7, R8 and R8B

http://www.iserv.net/~n8kdv/dxpage.htm

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

"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


I have no idea how well the antenna works, but the method of connecting the
reisistor is very complicated. May I suggest:

Connect the two wires to a normal dog-bone insulator, and solder the
resistor across the insulator to the two wires. Insulate if you wish. For
receive only, a 1/2 W resistor is as good, or better.

Tam/WB2TT