Mell What frequency do AM stations transmit at?
The frequency band used for AM radio is about 550 to 1720 kHz. This is the range of carrier frequencies available. The information transmitted is music and talk which falls in the audio spectrum. The full audio spectrum ranges up to 20 kHz, but AM radio limits the upper modulating frequency to 5 kHz.
Do radios transmit frequency?
Radio signal uses specific frequency, or how quickly the waves of the field move up and down. Hertz is a measurement of the number of wave cycles per second – AM is expressed in kiloHertz, while FM radio is expressed in megaHertz. The station power affects the range of the signal, or how far it can travel.
What happens if you put radio stations that transmit the same frequency close to each other?
First, you can’t put stations on the same frequency that are too close together in a geographic area. They will interfere with each other. And for the same reason you can’t have two stations close together in frequency (close to each other on the radio dial) in the same area.
Does the carrier frequency change in AM broadcasting?
In AM, the voltage or power level of the information signal changes the amplitude of the carrier in proportion (see Fig. When the modulating information signal (a sine wave) is applied, the carrier amplitude rises and falls in accordance. The carrier frequency remains constant during AM.
What is disadvantage of FM over AM?
Explanation: The disadvantage of FM over AM is that in frequency modulation large bandwidth is required. While, in case of advantages, FM is less prone to noise interference and has lower power consumption compared to AM. So it is only used in frequency modulation and not in amplitude modulation.
Does FM have a higher frequency than AM?
FM uses a higher frequency range and a bigger bandwidth than AM. AM radio operates from 535 kHz (kiloHertz) to 1605 kHz. When you tune the dial on your radio, the number changes by 10 kHz each time. This means that each station has 10 kHz of bandwidth on which to broadcast.
Why can you hear two radio stations at once?
When you can hear two stations at once, you are in an area where the signals from two radio transmitters are interfering. Each antenna has an allowed transmission power that let’s it cover a given area exclusively, but at the borders they sort of become muddled together.
Can two radio or TV stations broadcast on the same carrier frequency?
Since audible frequencies range up to 20 kHz (or 0.020 MHz) at most, the frequency of the FM radio wave can vary from the carrier by as much as 0.020 MHz. Thus the carrier frequencies of two different radio stations cannot be closer than 0.020 MHz.
How is a radio station assigned a frequency?
In some countries, an FM station may be assigned a frequency with an even decimal such as 106.2 MHz. In many places, AM broadcast stations are assigned on frequencies with a 9 kHz bandwidth (531 kHz, 540 kHz, 549 kHz, etc.). There are a few AM stations in the United States assigned in this manner, in Guam, the Marianas Islands, and American Samoa.
What are the rules for unlicensed radio stations?
Unlicensed operation on the AM and FM radio broadcast bands is permitted for some extremely low powered devices covered under Part 15 of the FCC’s rules. On FM frequencies, these devices are limited to an effective service range of approximately 200 feet (61 meters).
Why is my Radio not hearing the repeater signal?
Perhaps you’re not hearing the entire exchange if your radio is losing lock with the repeater signal due to a high bit-error rate. Does this happen inside, outside, or both?
Are there any radio stations with a 9 kHz bandwidth?
In many places, AM broadcast stations are assigned on frequencies with a 9 kHz bandwidth (531 kHz, 540 kHz, 549 kHz, etc.). There are a few AM stations in the United States assigned in this manner, in Guam, the Marianas Islands, and American Samoa.