A mic or other audio source, a transmitter and an antenna. Wireless mics are complete FM radio stations.
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Radio waves are generated and modulated with the transmitted information at the transmitting station and radiated by its antenna. These radio waves are picked up by the receiver antenna, filtered from all the other transmitted signals, detected and demodulated by the receiver to recover the transmitted information.
Researching to find the transmitting frequencies for Radio Tiempo has provided a wide range of results. It appears that there are a wide range of radio stations known as Radio Tiempo such as YVOZ, YSQJ, WNEL and WLZL. Due to the wide range of listings for a variety of Radio Tiempo listings it is impossible to provide a true transmitting frequency.
No. Except for brief periods during wartime, radio receiving equipment has never been regulated. Only transmitting equipment is regulated, for the purpose of keeping things orderly enough so that no transmitter will interfere with the signals of another one. (Personally, I think some receiving equipment should be regulated, specifically speed radar detectors. But that's just my opinion; I could be wrong.)
It is a shortened form of radiotelegraph - apparatus for transmitting or receiving radio broadcasts. Derived from Radiophone and Radiotelography, words coined in the 1890's
The mode of communications radio equipment deal with is radio frequency communications. Due to the concern of public safety radio communications now send signals digitally.