On 8 Apr, 17:52, "Jimmie D" wrote:
"art" wrote in message

oups.com...





On 6 Apr, 08:48, (Richard Harrison) wrote:
Art wrote:

"Frankly a lot of people on this net need to get up to speed with
respect to radiation such as tipped antennas ---."

Yesterday`s response seems to have been gobbled in cyber space.

Not all my reference books are over 50 years old. One of my best was
published in 2003 although its principal author was born in 1910. He is
J.D. Kraus, but he had numerous and likely younger collaborators, 6 of
whom are listed as co-authors. The title: "Antennas For All
Applications. 3rd edition".

On page 297 is found an item which illustrates what happens when you tip
an antenna. It is titled: "Antenna Rotation Experiments":
"Consider the radio circuit shown in Fig. 8-74a in which one antenna is
circularly polarized (a turnstile?) and the other is linearly polarized.
If one of the antennas is rotated about its axis a frequency f (r/s),
the received signal is shifted to F + or - f, where F is the transmitter
frequency."

Fig. 8-74 notes:
"Antenna rotation produces amplitude modulation."

Of course it does. When the linear antenna is aligned parallel to one
axis of the CP antenna, the signal is maximum. When the linear antenna
is most misaligned with either axis of the CP antenna, signal is a
minimum. The example demonstrates why polarization alignment, not
tipping or tilt, is usually important.

Best regards, Richard Harrison, KB5WZI

Richard, I couldn't find my Kraus book so I will have to let your
comment go.
I did look in the Jasik book on parasitic elements.
It said"A parrasitic element properly tuned will operate in phase-and-
field relationships
approximating those computed.In multi element arrays, independent
control and phase and amplitude is required and parasitics should be
avoided. However, they may be employed in antennas
designed primarily for power gain" To me this describes a yagi with
parasitic elements designed for power gain regardless of the mix of
polarisation. The Gauss system which does not use parasitics and
therefore pursues the independent control AND PHASE AND AMPLITUDE.
A yagi in a 90 degree multiple of earth does operate in a field
relationship because of its multi phase radiation where as the
gaussion tilts to remove unwanted phase and keeps only the required
phase. This is extremely important in cell transmittions since
channels are only of use when the polarisation is correct and any area
that does not comprise of the correct polarisation results in a
dropped call.
In my last post I mentioned the slope between scanning lines on a T.V.
as a reference line for true polarity. Any comment with respect to the
veracity of that statement since I see a direct corrorally between
that and radiation tilt angles?
Best regards
Art

Perhaps you should actually make an effort to explain why you see the
relationships you see. I can think of no reason why anyone should be
expected to go into great detail to explain your fallacies while you use
almost no effort to explain why you think you are right.
such that the horizontal vecot
Jimmie- Hide quoted text -

- Show quoted text -

I think I will try one more time with respect to tilt angle.
ARRL publications suggest that a vertical dipole only radiates a
vertically polarized radiation
Amatures read these publication and follow suit on their thinking, if
they can think that is,anything else must be wrong.
Well Jimmie you must surely know that only one electron stream travels
at the same angle as the dipole, any thing else does not. Therefore
the resultant vector angle cannot be parallel to the radiating member
and thus will radiate some horizontal radiation. To remove vertical
radiation you must tip the vertical dipole until the horizontal vector
is removed. All very simple.
Still to difficult for you? Well try this. Use your antenna program to
determine the horizontal
radiation and vertical radiation of a vertical dipole. Now model a
tipped dipole until the horizontal radiation is removed leaving only
vertical radiation and "Bingo" you should now understand and possibly
other amateurs will now question what they read in books. Tho I doubt
that since learners seem to only to be able to regurgitate rather than
activate their brain.
If you are still not comfortable read Maxwells laws and activate your
own brain and follow the leads given. There is no way I can activate
your brain or any of the pseudo experts brains on line.
Art
Art