On Fri, 19 Aug 2005 20:21:38 +0000 (UTC), "Reg Edwards"
wrote:

Is the radiation pattern in the horizontal plane perfectly
omni-directional?

No (and begs the question, what IS perfect?).

On Fri, 19 Aug 2005 22:00:33 +0000 (UTC), "Reg Edwards"
wrote:

What is the radiation pattern in the horizontal plane?

Just like for the two lobes of a dipole, three lobes for a tripole.

Also what is the equivalent load impedance between each of the line
wires.

35 Ohms.

Hardly comes to the class of pageantry in:
On Tue, 16 Aug 2005 16:15:10 +0000 (UTC), "Reg Edwards"
wrote:

Is there anybody about who still imagines that an SWR meter, located
... on the other side of the tuner, indicates
SWR on the transmission line between transmitter and the antenna?

Anybody indeed? Name someone else other than yourself, Reg. Jeesh....

Time to throw in the last spade of earth and say Amen.

73's
Richard Clark, KB7QHC

"Richard Clark" wrote
What is the radiation pattern in the horizontal plane?

Just like for the two lobes of a dipole, three lobes for a tripole.

Also what is the equivalent load impedance between each of the line
wires.

35 Ohms.

===================================
Richard,
Would you care to divulge how you obtained these two answers?
----
Reg.

On Sat, 20 Aug 2005 08:51:12 +0000 (UTC), "Reg Edwards"
wrote:


"Richard Clark" wrote
What is the radiation pattern in the horizontal plane?

Just like for the two lobes of a dipole, three lobes for a tripole.

Also what is the equivalent load impedance between each of the line
wires.

35 Ohms.

===================================
Richard,
Would you care to divulge how you obtained these two answers?

Hi Reg,

Sure. Why don't you first confirm them?

On the other hand - how could it be otherwise?

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...
On Fri, 19 Aug 2005 20:21:38 +0000 (UTC), "Reg Edwards"
wrote:

Is the radiation pattern in the horizontal plane perfectly
omni-directional?

No (and begs the question, what IS perfect?).

On Fri, 19 Aug 2005 22:00:33 +0000 (UTC), "Reg Edwards"
wrote:

What is the radiation pattern in the horizontal plane?

Just like for the two lobes of a dipole, three lobes for a tripole.

Also what is the equivalent load impedance between each of the line
wires.

35 Ohms.

Hardly comes to the class of pageantry in:
On Tue, 16 Aug 2005 16:15:10 +0000 (UTC), "Reg Edwards"
wrote:

Is there anybody about who still imagines that an SWR meter, located
... on the other side of the tuner, indicates
SWR on the transmission line between transmitter and the antenna?

Anybody indeed? Name someone else other than yourself, Reg. Jeesh....

Time to throw in the last spade of earth and say Amen.

73's
Richard Clark, KB7QHC

I ran EZNEC on what I think is an equivalent arrangement, and got a gain
max/min ratio of about 4db. Got an impedance of 29 Ohms. With multiple
sources, I have trouble visualizing what that means. That may actually be 87
Ohms line to line.

Tam/WB2TT

On Sat, 20 Aug 2005 20:00:16 -0400, "Tam/WB2TT"
wrote:

I have trouble visualizing what that means.

Hi Tam,

What do you mean by that? You have a source pushing current into an
element against a counterpoise, an active one albeit, but all
counterpoises support current too (hence the symmetry of resistance).
Just another condition of the ENTIRE structure radiating energy (where
some would have energy cancelled rather than the power product into a
remote load).

Yes, the three leaf trifoil is not very pronounced, and only below an
elevation or 45 degrees or so. However, Reg introduced this with the
strong suggestion of perfection. Perhaps his usual indirection. ;-)

A 4-phase antenna shows a similar lobing to a smaller degree, and a
5-phase antenna is for all practical purposes circular.

I had to solve a problem like this a couple of years ago with a design
for the Army to test their Helicopter pilots for mental alertness.
This involved building a uniform field of even illumination over a
visual angle of 180 degrees horizontal and 90 degrees vertical
(roughly the entire field of view). I was tasked to present no more
variation than a couple of percent ripple. It took about 100 light
sources 1 cM from the eyes.

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...
On Sat, 20 Aug 2005 20:00:16 -0400, "Tam/WB2TT"
wrote:

I have trouble visualizing what that means.

Hi Tam,

What do you mean by that? You have a source pushing current into an
element against a counterpoise, an active one albeit, but all
counterpoises support current too (hence the symmetry of resistance).
Just another condition of the ENTIRE structure radiating energy (where
some would have energy cancelled rather than the power product into a
remote load).

Yes, the three leaf trifoil is not very pronounced, and only below an
elevation or 45 degrees or so. However, Reg introduced this with the
strong suggestion of perfection. Perhaps his usual indirection. ;-)

A 4-phase antenna shows a similar lobing to a smaller degree, and a
5-phase antenna is for all practical purposes circular.

I had to solve a problem like this a couple of years ago with a design
for the Army to test their Helicopter pilots for mental alertness.
This involved building a uniform field of even illumination over a
visual angle of 180 degrees horizontal and 90 degrees vertical
(roughly the entire field of view). I was tasked to present no more
variation than a couple of percent ripple. It took about 100 light
sources 1 cM from the eyes.

73's
Richard Clark, KB7QHC

Hi Richard,

My main problem was interpreting what EZNEC meant when it told me the
impedance was 29 Ohms at resonance. Missed the fact that it displays the Z
for each generator independently. 29 is the impedance to neutral. So, that
makes it 87 Ohms line to line. I did this in free space. There is no NET
current in the neutral.

Tam

On Sun, 21 Aug 2005 12:03:00 -0400, "Tam/WB2TT"
wrote:

My main problem was interpreting what EZNEC meant when it told me the
impedance was 29 Ohms at resonance. Missed the fact that it displays the Z
for each generator independently. 29 is the impedance to neutral. So, that
makes it 87 Ohms line to line. I did this in free space. There is no NET
current in the neutral.

Hi Tam,

I took the more practical (amusing given the absurd complication of a
3-phase RF source) route of putting the antenna ¼ above earth.

73's
Richard Clark, KB7QHC