Tilted radiator
 

"Dave" wrote in message
...

"Art Unwin" wrote in message
...
On Sep 12, 7:55 pm, "Frank" wrote:
The navy would not change to a antenna that was not resonant.

sure they would, there is no reason to have a resonant antenna... a
non-resonant one radiates just fine when you have the power to get the
current into it. its all in the driving and matching networks.


the other one that art has never answered is that if it takes his magical
mystery particles settling on diamagnetic materials and then hopping around
against gravity because of the weak force, why do my ferromagnetic antennas
radiate so well? according to him they shouldn't have the magical mystery
particles so shouldn't be able to radiate because all the current would be
stuck on the inside of the conductors going back to the source instead of
hopping up and down in joy with all those particles... come on art, explain
that one in terms of your neutrino based weak force optimizer that you
pulled off the shelf that was written by someone who ignored the weak force
and neutrinos.

Tilted radiator
 

The original question said VERTICAL dipole , but you modeled a
HORIZONTAL dipole? Or was one of these just a typo?

FWIW, I modeled your horizontal dipole in EZNEC and came up with
slightly DIFFERENT results:
Resonant frequency about 7.335 Mhz
Resistance about 81 ohms
Max gain about 6.54 dBi at 30 degrees
I am INexperienced in using EZNEC and wonder if I'm doing something
wrong?

--Myron, W0PBV.

No, you are correct. I must have been asleep. Funny that nobody
else noticed my error. The difference in your results are probably
due to the fact that EZNEC does not use the Sommerfeld/Norton
ground model which produces more accurate results when the
radiator is near to the ground.

Frank VE6CB

Tilted radiator
 

On Sep 13, 10:42*am, "Frank" wrote:
The original question said VERTICAL dipole , but you modeled a
HORIZONTAL dipole? *Or was one of these just a typo?

FWIW, I modeled your horizontal dipole in EZNEC and came up with
slightly DIFFERENT results:
* Resonant frequency about 7.335 Mhz
* Resistance about 81 ohms
* Max gain about 6.54 dBi at 30 degrees
I am INexperienced in using EZNEC and wonder if I'm doing something
wrong?

--Myron, W0PBV.

No, you are correct. *I must have been asleep. *Funny that nobody
else noticed my error. *The difference in your results are probably
due to the fact that EZNEC does not use the Sommerfeld/Norton
ground model which produces more accurate results when the
radiator is near to the ground.

Frank VE6CB

well done

Tilted radiator
 

On Sat, 13 Sep 2008 15:42:00 GMT, "Frank"
wrote:

No, you are correct. I must have been asleep. Funny that nobody
else noticed my error. The difference in your results are probably
due to the fact that EZNEC does not use the Sommerfeld/Norton
ground model which produces more accurate results when the
radiator is near to the ground.

Hi Frank,

It was noticed, but certainly not by Authur. I don't hold out any
hope of ever seeing him do half the work to show numbers to prove his
concept.

However, you are still asleep. EZNEC does offer you the choice of
Sommerfeld/Norton grounds, and you even get to define the
characteristics of that ground. This, too, is something that Authur
has no competence with, or let's just say he has refused to share
actual data there too.

As for the Navy using tilted antennas (suggested by an unnamed
admiral, Authur's usual anonymous authorities).... Well, I have been
invited aboard fighting ships in the last year. I have inspected
their AEGIS radars systems. I have taken pictures of their antennas.
If any one is interested, I could post some at my web site that are
absolutely beyond many correspondent's experience. They are not
tilted (an absurdity) unless a hurricane force wave slapped them into
the hull (not obviously evident by any evidence however).

73's
Richard Clark, KB7QHC

Tilted radiator
 

Hi Frank,

It was noticed, but certainly not by Authur. I don't hold out any
hope of ever seeing him do half the work to show numbers to prove his
concept.

However, you are still asleep. EZNEC does offer you the choice of
Sommerfeld/Norton grounds, and you even get to define the
characteristics of that ground. This, too, is something that Authur
has no competence with, or let's just say he has refused to share
actual data there too.

As for the Navy using tilted antennas (suggested by an unnamed
admiral, Authur's usual anonymous authorities).... Well, I have been
invited aboard fighting ships in the last year. I have inspected
their AEGIS radars systems. I have taken pictures of their antennas.
If any one is interested, I could post some at my web site that are
absolutely beyond many correspondent's experience. They are not
tilted (an absurdity) unless a hurricane force wave slapped them into
the hull (not obviously evident by any evidence however).

73's
Richard Clark, KB7QHC

Thanks for the info Richard. Obviously any NEC based program
will have the Sommerfeld/Norton option. As for Navy antennas;
I have seen that they can be tilted, but only so they do not
get shot to pieces by the ships weapons. I too wondered "What
admiral, and in which port".

73, Frank, VE6CB

Tilted radiator
 

"Dave" wrote in message
...

"Dave" wrote in message
...

"Art Unwin" wrote in message
...
On Sep 12, 7:55 pm, "Frank" wrote:
The navy would not change to a antenna that was not resonant.

sure they would, there is no reason to have a resonant antenna... a
non-resonant one radiates just fine when you have the power to get the
current into it. its all in the driving and matching networks.


the other one that art has never answered is that if it takes his magical
mystery particles settling on diamagnetic materials and then hopping
around against gravity because of the weak force, why do my ferromagnetic
antennas radiate so well? according to him they shouldn't have the
magical mystery particles so shouldn't be able to radiate because all the
current would be stuck on the inside of the conductors going back to the
source instead of hopping up and down in joy with all those particles...
come on art, explain that one in terms of your neutrino based weak force
optimizer that you pulled off the shelf that was written by someone who
ignored the weak force and neutrinos.


come on art! wx was nice today, but expecting more rain tomorrow, come up
with something good to keep us amused!

Tilted radiator
 

"Art Unwin" wrote in message
...
A sloper antenna when resonant produces more gain
than a vertical dipole resonant at the same frequency.
True or false? prove it

Gain in which direction? True AND False - Prove otherwise.

Tilted radiator
 

NOTE: This is a repost from my sent file. It didn't appear
20 hours or so after I sent it. Sorry if it's a dupe to anybody.
---------------------------------------------------------------------
"Art Unwin" wrote in message
news:7ce5bd71-d583-433d-88f0-

snip

The navy would not change to a antenna that was not resonant.

Perhaps you are speaking of another country's Navy with which you are
well-acquainted.

Having been intimately involved with US Navy electronics for over 45 years
(active duty 1962 -1982; civilian support in multiple capacities 1982 -
2007) I can tell you that our Navy has numerous shipboard and
shore-establishment antennas that are not resonant. Since flexibility in
frequency selection confers a tactical advantage, broadbanding is far more
important. Tuners and couplers of several designs allow non-resonant
antennas to work well.

The closest the Navy gets to resonant antennas is in some special
fixed-frequency applications, like IFF. Of course, antennas are sized for
the application and will probably exhibit resonance within their band of
operation, but that's not the design goal.

Tilted radiator
 

"Richard Clark" wrote in message
...


As for the Navy using tilted antennas (suggested by an unnamed
admiral, Authur's usual anonymous authorities).... Well, I have been
invited aboard fighting ships in the last year. I have inspected
their AEGIS radars systems. I have taken pictures of their antennas.
If any one is interested, I could post some at my web site that are
absolutely beyond many correspondent's experience. They are not
tilted (an absurdity) unless a hurricane force wave slapped them into
the hull (not obviously evident by any evidence however).

Absurdity or no, a "stealthing" technique for the Arleigh Burke class
of destroyers involves sharply limiting the radar cross-section by not
installing vertical structures, including most, if not all, the antennas.

See this picture, which is typical.

http://en.wikipedia.org/wiki/Image:U...iterranean.jpg

You can clearly see two pairs of tilted HF whips, one pair amidships and
another pair on the stern. This same stealthing technique is being
employed on the new LPD-17 class.

Some Navy antennas are mounted on tilting mechanisms which allow
them to pivot all the way horizontal, so as not to be a hazard to aircraft.
That's different.

Tilted radiator
 

On Sep 14, 12:23*am, "Sal M. Onella"
wrote:
NOTE: *This is a repost from my sent file. *It didn't appear
20 hours or so after I sent it. *Sorry if it's a dupe to anybody.
---------------------------------------------------------------------"Art Unwin" wrote in message

news:7ce5bd71-d583-433d-88f0-

snip

The navy would not change to a antenna that was not resonant.

Perhaps you are speaking of another country's Navy with which you are
well-acquainted.

Having been intimately involved with US Navy electronics for over 45 years
(active duty 1962 -1982; civilian support in multiple capacities 1982 -
2007) *I can tell you that our Navy has numerous shipboard and
shore-establishment antennas that are not resonant. *Since flexibility in
frequency selection confers a tactical advantage, broadbanding is far more
important. *Tuners and couplers of several designs allow non-resonant
antennas to work well.

The closest the Navy gets to resonant antennas is in some special
fixed-frequency applications, like IFF. *Of course, antennas are sized for
the application and will probably exhibit resonance within their band of
operation, but that's not the design goal.

These were shore based installations probably in Hawaii or some
island.
With respect to resonance, moving away from such as well as changing
from 15 degrees
(Frank's 30 degrees divided by two)
would provide a pattern of distinct advantage which the navy is
constantly looking for
For a whip tipped at an angle of 15 degrees can provide a forward
pattern of gain which can be a big deal
I anticipate that the navy will gyrate towards helical design where
the addition of a magnetic field will give a pattern of choice
together with resonance the size of a shoebox to reduce the number of
antennas on board.
Thanks for the info, it certainly was not silly As an aside the 15
degrees is the same as found empirically by Kraus
in the pitch angle of a helical, another example of the inclusion of
the weak force in a system in equilibrium !