FM radio waves and radio stations

In summary, FM radio stations use frequency modulation to transmit their information, but each station is assigned a specific frequency with a channel width of 200 kHz. The signal varies by up to 75 kHz from the center, resulting in an occupied bandwidth of 150 MHz with a 25 kHz guard band on each side. This allows for stations on adjacent frequencies to be spaced far apart geographically.
  • #1
coktail
118
1
Hi there. I have a (hopefully) quick question here.

FM radio stations transmit their information by manipulating the frequency of radio waves, but each radio station is assigned to a specific frequency. If the frequency broadcasted by a radio station is constantly changing (to transmit info), how is it that you stay locked into a single station?

I hope that makes sense, and thanks!
 
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  • #2
To modulate the signal FM radio station only use a deviation of 75 kHz from center frequency.
 
  • #3
Thanks!
 
  • #4
Each FM broadcast station is given a channel width of 200 kHz. As sas3 said the signal varies by up to 75 kHz from the center of the channel resulting in a occupied bandwidth of approximately 150 MHz with a guard band of 25 kHz on each side. Even with the guard band, stations on adjacent frequencies are spaced far apart geographically.
 
  • #5


Hi there,

Thank you for your question. I would be happy to explain how FM radio waves and radio stations work.

FM (Frequency Modulation) radio stations use a technique called frequency modulation to transmit their information. This means that the frequency of the radio waves being transmitted is constantly changing to carry the audio signals. However, as you mentioned, each radio station is assigned to a specific frequency. This is known as the carrier frequency and it is the main frequency that the station uses to transmit its signals.

When you tune your radio to a specific station, the radio receiver is designed to pick up the carrier frequency of that station. This frequency is then amplified and the audio signals are separated from it. The audio signals are then sent to the speaker of your radio, allowing you to hear the broadcast.

The reason you stay locked into a single station is because your radio receiver is designed to only pick up the carrier frequency of that specific station. It filters out all other frequencies, allowing you to hear a clear and uninterrupted broadcast from that station.

I hope this explanation helps to clarify your question. Let me know if you have any further inquiries. Thank you.
 

1. What are FM radio waves?

FM radio waves are a type of electromagnetic radiation that is used to transmit radio signals. These waves have a frequency range of 88 to 108 megahertz (MHz) and are able to travel long distances without losing their strength.

2. How do FM radio waves work?

FM radio waves are generated by a radio station's transmitter and then travel through the atmosphere until they reach a receiver, such as a car radio or a home stereo. The receiver then decodes the waves and converts them into the audio signals that we hear as music or talk radio.

3. What is the difference between AM and FM radio waves?

The main difference between AM (amplitude modulation) and FM (frequency modulation) radio waves is the way in which they carry information. AM waves vary the amplitude, or height, of the waves to transmit signals, while FM waves vary the frequency, or number of waves, to transmit signals. FM waves are also less prone to interference and produce higher quality sound compared to AM waves.

4. How far can FM radio waves travel?

The maximum distance that FM radio waves can travel depends on a variety of factors, including the power of the transmitter, the terrain, and atmospheric conditions. Generally, FM radio waves can travel up to 60 miles in a straight line from the transmitter, but they can also be reflected and bounce off of objects, allowing them to reach even farther distances.

5. How many radio stations can FM radio waves carry?

The number of radio stations that can be carried by FM radio waves varies depending on the frequency range and bandwidth of the waves, as well as the location of the listener. In heavily populated areas, there may be hundreds of FM radio stations available, while in more rural areas, there may be fewer options. The number of stations can also vary depending on the strength and location of the radio receiver.

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