Which is best for FM Broadcast Reception - Vertical or Horizontal Antennas? - uhf vertical collinear
For many years of experience with the amateur (HAM) radio, I learned that the major attenuation of UHF and VHF signals when transmitting and receiving antennas separated by 90 degrees.
However, most cars are vertically polarized antennas (about 45 degrees), while most home receive antennas (both cheap wire dipole and Yagi) can buy, you are horizontally polarized.
Why is this so?
Broadcasters are transmitting antennas both horizontally and vertically?
I ask because I live 60 miles to accommodate several FM stations that I listen to can and with the antenna, or my car or my attic to horizontal Yagi.
Thursday, January 28, 2010
Uhf Vertical Collinear Which Is Best For FM Broadcast Reception - Vertical Or Horizontal Antennas?
4 comments:
Historically, the FM introduced by the horizontal polarization, for playback of high quality home and fixed sites.
When portable FM was the practice has been fitted with a whip, with a common "knee" at the base, so it could be horizontally for better reception. It is very convenient. As you said, cars tend to use a vertical whip.
Today FM stations tend to use circular polarization. In the simplest case, fed, and the horizontal and vertical antennas, a signal with a phase difference of 90 degrees between them. The effect is obviously filmed e-component. This gives a good signal for a receiving antenna oriented in any direction.
Most of the static nature is vertical, and the trees are vertically polarized. If the horizontal and vertical tube station should be the loss of about 30 dB. This gives a large absorption signal. U When you better through a forest trying to shoot from horizontal. You need an antenna of about 10 dB gain. and in a position to the point on the underground station can be run like. If this is not enough to put an amplifier to get to the top of the antenna and coax him back to prevent radiation outside of the amplifier. and causes network N2 things oscillation.look communications products. They have some amplifiers with very low noise levels. Good luck
In the U.S., and FM signals in the VHF television are horizontally polarized, horizontal antennas are best for picking up their signals. The frequency of the FM transmission is comparable to the low VHF TV signal for the same antenna may very well serve for both.
The signals of AM radio commercial, however, are much rarer and are vertically polarized. These are from the FM signals and different antennas can be completely independent. The whip antenna that will look great on bumpers and fenders, as a rule not to pick up FM signals.
If you are so inclined, you may want to look a little closer to the car radio to find out what and where the FM antenna. On some vehicles, the FM antenna is built into the windshield. This kind of looks like a pair of thin vertical black lines from a few inches above the bottom of the windshield, turn the other in a horizontal line at the top. This is half-dipole antenna classical horizontally signal polarization. In some vehicles, the antenna is placed into a box-shaped boomerang, with one foot from the bottom through which the chamber placed in the trunk or cabin top.
The orientation is primarily an adjacent
Issue of optimizing the reception of the transmission power
transmitted and is not really a part of MS or signal analysis.
Electromagnetic waves have a polarization rotation.
Thus, the whole orientation of work, only
In addition to designing a particular environment.
Since many modern cars should not
adjacent to all external. Integrated
into the glass of the window.
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