It creates an alternating current at the same frequency as the radio wave
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Unscrew the aerial mounting bolt on the wing. Turn on the radio and pull out the old aerial mast. Now put in the new aerial mast and get some one to push the button in the cab to wind the aerial down. The motor will draw in the new aerial mast, replace the bolt.
The audio from the broadcast radio station is converted into a series of electro-magnetic radio waves via an aerial, which is receieved by the aerial in a radio and demodulated back into an audible signal again.
If the CD/cassette is working OK, this is likely to be either the aerial or the aerial extension lead at fault.
There are two main types of electric car aerial; automatic and semi-automatic. Automatic ones raise or lower when the ignition and/or the radio is turned on. Semi-automatic ones have a selector switch on the dashboard. When either of the conditions shown above exist, a relay turns ON and passes power to a motor at the base of the aerial. The motor then raises the aerial until it reaches its upper position where a limit switch breaks the circuit. The relay remains in the ON position and the aerial remains in the raised position until the ignition and/or the radio is turned off. When the ignition and/or the radio is turned off, the relay goes into the OFF condition. Power now flows through a second circuit in the relay and also through a second circuit in the aerial motor to reverse the drive and lower the aerial until a second, lower limit switch is broken. The relay is a single-throw, double-pole unit. The aerial motor is a three-wire unit and often incorporates a circuit breaker.
There are dozens of listings for radio stations in PA. In Reading PA there is a radio station named on the radio that plays heavy metal music. A few music stations are WMMR, WYSP, WIP FM, and WABC FM.