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



When you run a 73 ohm "resistor" and a 50 ohm resistor in parallel?

You would need a balun (rf transformer) to match to that antenna ...

Then you would need a suitable name for it. Let me see, we are mating
up a "dummy load" with a "dipole." How about "Dummy-Pole?" grin

Regards,
JS

On Wed, 08 Oct 2008 10:07:03 -0700, John Smith
wrote:

You would need a balun (rf transformer) to match to that antenna ...

Then you would need a suitable name for it. Let me see, we are mating
up a "dummy load" with a "dipole." How about "Dummy-Pole?" grin

Been there, done that. About 30 years ago, I went on a field day
exercise where one of the HF stations was running a lightbulb on a
pole for an antenna. 100 watts RF, about 50ft of RG-8/u, voltage
stepped down with some kind of xfomer or balun, and a 150 watt
incandescent light bulb. I don't recall how well they did, but I
could see that the log was filling with contacts. Who needs an
antenna anyway?

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann wrote:
On Wed, 08 Oct 2008 10:07:03 -0700, John Smith
wrote:

...
Then you would need a suitable name for it. Let me see, we are mating
up a "dummy load" with a "dipole." How about "Dummy-Pole?" grin

Been there, done that. About 30 years ago, I went on a field day
exercise where one of the HF stations was running a lightbulb on a
pole for an antenna. 100 watts RF, about 50ft of RG-8/u, voltage
stepped down with some kind of xfomer or balun, and a 150 watt
incandescent light bulb. I don't recall how well they did, but I
could see that the log was filling with contacts. Who needs an
antenna anyway?


Hmmm, sounds like that you mention might be the "Original DummyPole!"
Or, "DummyPole I."

This new design should probably be named "DummyPole II." grin

Regards,
JS

On Fri, 10 Oct 2008 18:03:39 -0700, John Smith
wrote:

Hmmm, sounds like that you mention might be the "Original DummyPole!"
Or, "DummyPole I."

This new design should probably be named "DummyPole II." grin

Nope. I vaguely recall it was called a "lamptenna".

Somewhat later, I helped build a dipole using four 4ft fluorescent
tubes (two in each leg of the dipole hung horizontally on bamboo
poles). The 96" length was about right for a 10 meter dipole. About
80 watts out got the bulbs to light up. Once lit, the tubes were
quite conductive and made a functional transmit antenna and impressive
light show. It was totally useless for CW, kinda marginal for SSB,
and just great for AM. We had RTTY but couldn't find anyone to help
test it. We never did figure out how to light up the bulbs so we
could try receive. Various gross violations of the electrical code
and of common sense were attempted with no useful results.

There are those that can see the light...
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com
# http://www.LearnByDestroying.com AE6KS

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

When you run a 73 ohm "resistor" and a 50 ohm resistor in parallel?

You would need a balun (rf transformer) to match to that antenna ...

Then you would need a suitable name for it. *Let me see, we are mating
up a "dummy load" with a "dipole." *How about "Dummy-Pole?" *grin

Regards,
JS

I'm glad you called it a 'balun (rf transformer)' instead of a 'balun
(CM Choke)'. Did Cecil review this before you posted it?

wrote:

...
I'm glad you called it a 'balun (rf transformer)' instead of a 'balun
(CM Choke)'. Did Cecil review this before you posted it?

That is very disappointing and does not speak well for you.

I certainly expected you to realize a 1:1 balun (1:1 rf transformer
constructed in transmission line mode) IS a common mode choke ... :-(

Hang in there ... you'll get it ... eventually.

Regards,
JS

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

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


You would probably be better off loss-wise just using 1000'
of RG58 feedline......same result; lots of loss, low SWR.

Rick - W7RT