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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 |