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

I will have to read it for myself, it doesn't seem to be relavent but
I'll check to see if you are seeing things in context. The book I
quoted regarding scan lines was Terman by the way. The Kraus book did
not present any great changes to older versions which is often the
case when publishers present 2nd or 3rd editions to squeeze any
remaining profits However I will read it to see if the microwave
portion is up to date rather than a reissue