On Fri, 10 Apr 2009 16:49:31 -0700 (PDT), Art Unwin
wrote:

1. What frequency
2. What is the dish diameter
3. What is the dish focal length to diameter ratio (F/D)

I am not avoiding questions, just those that appear irrelevant,

20 postings to get to the point (not unanticipated, however) which Art
calls "irrelevant."

As for those answers?
1 160 metres upto 2 metres, tunable

2 2 metres
Hence the wholesale disregard for first principles in size vs.
wavelength. Elementary analysis need not go any further when failure
is so obviously designed in.

3 Doesn't have a focal length, it is an end fed ( series connection)
helix antenna.
-Well, maybe not obvious to everyone.-

But why don't we chalk this design up to S U C C E S S and call it a
thread? If this bier gets anymore wreaths tossed onto it, it will
kill the pallbearers.

73's
Richard Clark, KB7QHC

On Apr 10, 7:19*pm, Richard Clark wrote:
On Fri, 10 Apr 2009 16:49:31 -0700 (PDT), Art Unwin

wrote:
1. What frequency
2. What is the dish diameter
3. What is the dish focal length to diameter ratio (F/D)

I am not avoiding questions, just those that appear irrelevant,

20 postings to get to the point (not unanticipated, however) which Art
calls "irrelevant."

As for those answers?

1 160 metres upto 2 metres, tunable
2 2 metres

Hence the wholesale disregard for first principles in size vs.
wavelength. *Elementary analysis need not go any further when failure
is so obviously designed in. *

3 Doesn't have a focal length, it is an end fed ( series connection)
helix antenna.

-Well, maybe not obvious to everyone.-

But why don't we chalk this design up to S U C C E S S and call it a
thread? *If this bier gets anymore wreaths tossed onto it, it will
kill the pallbearers.

73's
Richard Clark, KB7QHC

The posting is about dishes not antennas. I have not read about a dish
that does not emit signals to the rear. Now I have built one and find
to my surprize that it does accept signals from the rear ! All very
simple, the radiator is resting at the bottom of a cone and the top of
the radiator does not stick out beyond the reflector. Since you do not
know what you are talking about and intent is to disrupt this thread
why on earth are you muttering about nothing at length? Simple
question has been posed and obviously you do not know the answers that
antenna engineering knowledge would provide as you are not an engineer
but a actor or actress by day and by night. My question remains
unanswered after all these posts.How do signals arrive or depart from
the rear of a dish or horn? We all know that you don't know the answer
but there are qualified engineers in this group who possibly doand
willing to share.

The posting is about dishes not antennas. I have not read about a dish
that does not emit signals to the rear. Now I have built one and find
to my surprize that it does accept signals from the rear ! All very
simple, the radiator is resting at the bottom of a cone and the top of
the radiator does not stick out beyond the reflector. Since you do not
know what you are talking about and intent is to disrupt this thread
why on earth are you muttering about nothing at length? Simple
question has been posed and obviously you do not know the answers that
antenna engineering knowledge would provide as you are not an engineer
but a actor or actress by day and by night. My question remains
unanswered after all these posts.How do signals arrive or depart from
the rear of a dish or horn? We all know that you don't know the answer
but there are qualified engineers in this group who possibly doand
willing to share.

Your antenna has nothing to do with dish antennas, bu rather plane
reflectors (of which yours is way too small as Richard pointed out).
I know we cannot change your opinion or teach you anything- so I am out of
here.

Dale W4OP

On Apr 10, 8:13*pm, "Dale Parfitt" wrote:
*The posting is about dishes not antennas. I have not read about a dish
that does not emit signals to the rear. Now I have built one and find
to my surprize that it does accept signals from the rear ! All very
simple, the radiator is resting at the bottom of a cone and the top of
the radiator does not stick out beyond the reflector. Since you do not
know what you are talking about and intent is to disrupt this thread
why on earth are you muttering about nothing at length? Simple
question has been posed and obviously you do not know the answers that
antenna engineering knowledge would provide as you are not an engineer
but a actor or actress by day and by night. *My question remains
unanswered after all these posts.How do signals arrive or depart from
the rear of a dish or horn? We all know that you don't know the answer
but there are qualified engineers in this group who possibly doand
willing to share.

Your antenna has nothing to do with dish antennas, bu rather plane
reflectors (of which yours is way too small as Richard pointed out).
I know we cannot change your opinion or teach you anything- so I am out of
here.

Dale W4OP

Dale, my response above was with respect to Richard not you, but I did
know you would run eventually. Study the math of Maxwell and Gauss
before you decide to take up teaching.

Art Unwin wrote:

The posting is about dishes not antennas. I have not read about a dish
that does not emit signals to the rear. Now I have built one and find
to my surprize that it does accept signals from the rear ! All very
simple, the radiator is resting at the bottom of a cone and the top of
the radiator does not stick out beyond the reflector. Since you do not

Well, to start with Art, a cone reflector doesn't meet the definition of
a dish antenna.

I'm sorry, but they just aren't the same thing.

I surprizzzed you missed the difference.

tom
K0TAR

Tom Ring wrote:
Art Unwin wrote:
snip

tom
K0TAR

Jimmie

I just couldn't resist, just this once.

tom
K0TAR

On Apr 10, 8:45*pm, Tom Ring wrote:
Art Unwin wrote:

The posting is about dishes not antennas. I have not read about a dish
that does not emit signals to the rear. Now I have built one and find
to my surprize that it does accept signals from the rear ! All very
simple, the radiator is resting at the bottom of a cone and the top of
the radiator does not stick out beyond the reflector. Since you do not

Well, to start with Art, a cone reflector doesn't meet the definition of
a dish antenna.

I'm sorry, but they just aren't the same thing.

I surprizzzed you missed the difference.

tom
K0TAR

Tom
I asked the question as I am not personly knowledgable about dish
style reflectors.
I do read a lot and I read a paper once where it was found that a cone
shaped reflector produced increased gain when used with a helix
antenna, so I made one to try it out. Personaly I see it more as a
horn and not as a dish with a radiator at a phase control difference
from the reflector? Either way I do not understand how that I can hear
signals to the rear if the reflector envelope encloses the radiator
thus the question. Note that a helix radiates differently from the
normal dish radiator such that phasing does not enter the design which
is why you see planar dishes or "cups".
Thus questions with respect to reflector diameter are not
pertinentwhen the radiator is enclosed.

Art Unwin wrote:\
Tom
I asked the question as I am not personly knowledgable about dish
style reflectors.
I do read a lot and I read a paper once where it was found that a cone
shaped reflector produced increased gain when used with a helix
antenna, so I made one to try it out. Personaly I see it more as a
horn and not as a dish with a radiator at a phase control difference
from the reflector? Either way I do not understand how that I can hear
signals to the rear if the reflector envelope encloses the radiator
thus the question. Note that a helix radiates differently from the
normal dish radiator such that phasing does not enter the design which
is why you see planar dishes or "cups".
Thus questions with respect to reflector diameter are not
pertinentwhen the radiator is enclosed.

He is _awfully_ funny, isn't he?

tom
K0TAR

I don't see Art's postings except as they're quoted by others. But from
what I'm seeing here, it looks like he's done a great experiment which
graphically shows that radio waves don't act like particles. More
experiments along this line weren't really necessary, since it's been
known at least since Hertz's experiments in the 19th century. And anyone
who took high school physics and watched the ripples in the ripple tank
should be able to immediately predict what Art is describing. But I
suppose the experiment and its results might prove enlightening for
those readers who didn't take high school physics and who are nearly
completely unacquainted with electromagnetics.

Roy Lewallen, W7EL

Roy Lewallen wrote:
I don't see Art's postings except as they're quoted by others. But from
what I'm seeing here, it looks like he's done a great experiment which
graphically shows that radio waves don't act like particles. More
experiments along this line weren't really necessary, since it's been
known at least since Hertz's experiments in the 19th century. And
anyone who took high school physics and watched the ripples in the
ripple tank should be able to immediately predict what Art is
describing. But I suppose the experiment and its results might prove
enlightening for those readers who didn't take high school physics and
who are nearly completely unacquainted with electromagnetics.


Sorry, Roy, that experiment won't be possible. The bathtub is
permanently occupied by the wannabee Archimedes.



--

73 from Ian GM3SEK