From an offshore site:
http://www.radiohc.org/Distributions/Dxers/ttfd2.html


http://www.hard-core-dx.com/nordicdx...wire/t2fd.html

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

http://www.johncon.com/john/T2fd/

http://www.wellbrook.uk.com/UMBT2FD.html


http://home.comcast.net/~smithab11/T2FD.htm


http://www.korpi.biz/t2fd.pdf



"George Csahanin" wrote in message
...
Doesn't B&W do exactly that?

They called it a "balancing network" or some such thing...a resistor. Army
published a paper on it in the 40's or 50's.

Problem is the loss it causes.


-GC
W2DB


wrote in message
...
Howard,
Yes. Been some years ago now, but there was even a commercial
version sold (did pretty well too). Wish I could remember the name of
that thingy.
- 'Doc

Was an outfit here in the U.S actually "Marketed" such!
With claims that would give less than 3:1 SWR, on any frequency!
Wondered how it could do that and still perform- asked buddy (engineer)
and this was the "Black Box" he came up with! (50 ohm, 200 watt, non
inductive resistor! No majic involved, just a Dummy Load, in parallel
with a couple pieces of wire! Think ARRL, finally exposed it!
Yes it will radiate, but at WHAT effeciency?? Jim NN7K


wrote:
On Oct 8, 1:07 pm, John Smith wrote:
Howard Kowall wrote:
Has anyone ever tried putting a dipole antenna up with the center insulator
being a high power 50 ohm dummy load,then connecting the dipole elements
across the dummy load.This would always keep a suitable match at 50 ohms
and satisfy the transceiver.Would most of the power go to the dummy load and
not the elements and wouldn't radiate.In thinking about this it all
logically makes sense the load would really never change or would it have
some reactance with the dipole elements.
Thanx All
Howard
VE4ISP

Jim-NN7K wrote:
Was an outfit here in the U.S actually "Marketed" such!
With claims that would give less than 3:1 SWR, on any frequency!
Wondered how it could do that and still perform- asked buddy (engineer)
and this was the "Black Box" he came up with! (50 ohm, 200 watt, non
inductive resistor! No majic involved, just a Dummy Load, in parallel
with a couple pieces of wire! Think ARRL, finally exposed it!
Yes it will radiate, but at WHAT effeciency?? Jim NN7K

Makes me wonder if you have been paying attention?; indeed, it has been
the arrl which has been "exposed!" ROFLOL!

Regards,
JS

John Smith wrote:
Jim-NN7K wrote:
Was an outfit here in the U.S actually "Marketed" such!
With claims that would give less than 3:1 SWR, on any frequency!
Wondered how it could do that and still perform- asked buddy (engineer)
and this was the "Black Box" he came up with! (50 ohm, 200 watt, non
inductive resistor! No majic involved, just a Dummy Load, in parallel
with a couple pieces of wire! Think ARRL, finally exposed it!
Yes it will radiate, but at WHAT effeciency?? Jim NN7K

Makes me wonder if you have been paying attention?; indeed, it has been
the arrl which has been "exposed!" ROFLOL!

Regards,
JS
'Corse, this WAS from memory, of this antenna-- From some 25 YEARS ago!
When it was first introduced! Hindsight is always better than Foresight!
Jim

Bruce in alaska wrote:
In article ,
Michael Coslo wrote:

JIMMIE wrote:
Once I joke about using a CB groundplane with a 10 db pad for an all
band antenna.
I thought about this for a while and decided to try it. I did nt have
to use 10 db maybe it was only 3db or 6db I cant remember now
to get an antenna that my soliddtate transceiver with no tuner was
happy with on allHF bands. I was fairly amazed at how well the
antenna worked or at least amazed that it did work at all.

What is more, you didn't have to spend 600 dollars for a bad antenna.


- 73 de Mike N3LI -

Years ago, I was working on a Marine HF Radio, on the bench, in Seattle
WA, connected to a Bird 1 Kw Dummy Load. As I was setting the -16 db
Pilot Carrier Level for the Public Coast Station KMI, at Point Rayes CA,
on 12 Mhz, I got a reply from the Operator, ON Duty, asking for Station
Call Sign. I had a nice chat with him for about 5 minutes. ANY antenna,
no matter how it is built, even a Dummy Load, will radiate, and
communicate IF the Band is open. If the Band is closed, it doesn't
matter how efficient the antenna is, you will not communicate.


But we shouldn't have to spend 600 dollars to find that out! ;^)

While it is true that at ceratin times, anything will "get out", and at
other times, nothing does, there is a whole range in between. I did some
mobile contesting this weekend, and the consequences of having a bit
more efficent and productive antenna were apparent. Mor QSO's, and less
time spent doing multiple exchange sends.

And wow, the bands were weird this past weekend.


But given the results of shootouts, it is clear that having a good
mobile antenna will add quite a bit of punch to your signal. IIRC the
Hamsticks were about 20 db down (Cecil, I think you had some test
results, so correct me if I'm way off).

- 73 de Mike N3LI -

On Oct 13, 11:22*am, Michael Coslo wrote:
Bruce in alaska wrote:
In article ,
*Michael Coslo wrote:

JIMMIE wrote:
Once I joke about using a CB groundplane with a 10 db pad for an all
band antenna.
I thought about this for a while and decided to try it. I did nt have
to use 10 db maybe it was only 3db or 6db I cant remember now
to get an antenna that my soliddtate transceiver with no tuner was
happy with on allHF bands. I was fairly amazed at how well the
*antenna worked or at least amazed that it did work at all.

What is more, you didn't have to spend 600 dollars for a bad antenna.

* * * *- 73 de Mike N3LI -

Years ago, I was working on a Marine HF Radio, on the bench, in Seattle
WA, connected to a Bird 1 Kw Dummy Load. As I was setting the -16 db
Pilot Carrier Level for the Public Coast Station KMI, at Point Rayes CA,
on 12 Mhz, I got a reply from the Operator, ON Duty, asking for Station
Call Sign. I had a nice chat with him for about 5 minutes. ANY antenna,
no matter how it is built, even a Dummy Load, will radiate, and
communicate IF the Band is open. *If the Band is closed, it doesn't
matter how efficient the antenna is, you will not communicate.

But we shouldn't have to spend 600 dollars to find that out! ;^)

While it is true that at ceratin times, anything will "get out", and at
other times, nothing does, there is a whole range in between. I did some
mobile contesting this weekend, and the consequences of having a bit
more efficent and productive antenna were apparent. Mor QSO's, and less
time spent doing multiple exchange sends.

And wow, the bands were weird this past weekend.

But given the results of shootouts, it is clear that having a good
mobile antenna will add quite a bit of punch to your signal. IIRC the
Hamsticks were about 20 db down (Cecil, I think you had some test
results, so correct me if I'm way off).

* * * * - 73 de Mike N3LI -- Hide quoted text -

- Show quoted text -