How much power does an antenna receive?
For commercial broadcast antennas they use an array of vertical dipoles, so they won’t emit up or down, but mostly into horizontal plane. The antenna gain will be at least 2 or more, I assume 3x. So the field is likely about 0.7mW x 3 = 2mW/m2 at my location.
How many watts does a radio station use?
While US and Canadian Class A stations are authorized to operate at a maximum of 50,000 watts day and night (and a minimum of 10,000 watts at night, if grandfathered), certain existing Mexican Class A stations, and certain new Cuban Class A stations are authorized to operate at a higher power.
Does a radio receiver need power?
A passive, or zero-power, radio receiver uses no direct electrical power, but makes sole use of the power available from a transmitter via the radio spectrum.
Do radios use a lot of electricity?
Radios use between 1 watt per hour for a small AM/FM alarm clock radio to over 5 watts per hour for a larger digital radio. An average alarm clock radio is estimated to use between one and two watts of power every hour while models that have more features can go up to five watts. …
What kind of antenna do you need for FM radio?
For broadcast FM radio, you’ll need an antenna (a) in a high location, so receivers can clearly receive your signal; (b) high power, usually on the order of kilowatts. (WCBN-FM, a student radio station in Ann Arbor MI, uses a 200W transmitter, but has an effective range of around 10 miles).
How much power does an earth station transmitter use?
In satellite communications systems, earth-station transmitter power ranges from a few watts generated by SSPAs to about ten kilowatts generated by klystrons or TWTs. Transmitters up to 400 kW are used in the deep-space network.
How big of a transmitter do you need for FM radio?
If we restrict the variables to typical values for FM commercial broadcast stations, we can use the FCC’s rules to make some estimations. By that reckoning, you need a transmitter of around 50kW with an antenna 150 meters high to achieve your goal of high-quality coverage over a 20 mile radius. Unfortunately, that’s a very expensive transmitter.
How tall does an antenna need to be for long distance communications?
A height of 120 feet or even higher will provide even more advantages for long-distance communications. To a distant receiving station, a transmitting antenna at 120 feet will provide the effect of approximately 8 to 10 times more transmitting power than the same antenna at 35 feet.