Me wrote:
In article .com,
wrote:

By the way, are you an Amateur Radio Operator?
Gary N4AST


Since 1964


Me

Well Me, as for me, Amateur since 1963, professional radio engineer,
never. I did install some cb antennas during the early 1970's and got
paid, so I may be a professional antenna installer? Hope by these acts
I didn't give up my Amateur status. Was in college at the time and did
not have much $$. Why don't you give your call?
Gary N4AST

I am not sure, but I have been wondering for years.
Seriously

It's the old question: How do you load three guy wires?
73
H.


"Reg Edwards" wrote in message
...
There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

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

Reg:

I do understand this correctly, and each antenna is fed a signal 120
degrees out of electrical phase with the other 2. And, the physical
placement of the also happens so as to place any specific one of the three
antennas 120 degrees ahead/behind the other two in a physical circle?

John

On Fri, 19 Aug 2005 20:21:38 +0000, Reg Edwards wrote:

There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

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

"John Smith" wrote in message
news
Reg:

I do understand this correctly, and each antenna is fed a signal 120
degrees out of electrical phase with the other 2. And, the physical
placement of the also happens so as to place any specific one of the three
antennas 120 degrees ahead/behind the other two in a physical circle?

John

Are these antennas fed with coax?

Frank

Frank:

Let's hope Reg will enlighten us on the exact specifics... I am afraid it
his "word problem" and he says what is and what is not...

John

On Sat, 20 Aug 2005 02:34:35 +0000, Frank wrote:


"John Smith" wrote in message
news
Reg:

I do understand this correctly, and each antenna is fed a signal 120
degrees out of electrical phase with the other 2. And, the physical
placement of the also happens so as to place any specific one of the three
antennas 120 degrees ahead/behind the other two in a physical circle?

John

Are these antennas fed with coax?

Frank

Just a hint:
Think of how a turnstile antenna works. That one works in the
horizontal plane with 90 degree phasing. Check the radiation patern.


Reg Edwards wrote:
There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

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

BKR:

Reg has " There is a 3-phase transmitter feeding a 3-phase antenna..."

Does this mean the transmitter is powered off 3-phase 60 cycle (if so,
really doesn't affect the antenna) or is the transmitter final somehow
constructed with a tank supplying 3-phase rf???

Then the "3-phase antenna", is each monopole, dipole fed though different
lengths of feedline, with one 0 degree length, one 120 degree length, and
one 240 degree--electrical lengths?

Those brits can be tricky yanno! grin

John

On Fri, 19 Aug 2005 21:05:28 -0600, BKR wrote:


Just a hint:
Think of how a turnstile antenna works. That one works in the
horizontal plane with 90 degree phasing. Check the radiation patern.


Reg Edwards wrote:
There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

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

I think he was providing a simplified model by eliminating phasing
lines. As I understood it he meant that there 3 outputs from the TX
with 3 equal length feedlines or a special feedline, and that all are in
a rotating 120 degree progression.



John Smith wrote:

BKR:

Reg has " There is a 3-phase transmitter feeding a 3-phase antenna..."

Does this mean the transmitter is powered off 3-phase 60 cycle (if so,
really doesn't affect the antenna) or is the transmitter final somehow
constructed with a tank supplying 3-phase rf???

Then the "3-phase antenna", is each monopole, dipole fed though different
lengths of feedline, with one 0 degree length, one 120 degree length, and
one 240 degree--electrical lengths?

Those brits can be tricky yanno! grin

John

On Fri, 19 Aug 2005 21:05:28 -0600, BKR wrote:


Just a hint:
Think of how a turnstile antenna works. That one works in the
horizontal plane with 90 degree phasing. Check the radiation patern.


Reg Edwards wrote:

There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

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

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.