AM stands for Amplitude Modulation, and FM stands for Frequency Modulation. Both AM and FM radio programs are transmitted over the air via radio waves, which are part of a range of electromagnetic waves that include gamma rays, x-rays, ultraviolet rays, visible light, infrared, and microwave.
How does FM radio transmit information?
Frequency modulation or FM is a form of modulation which conveys information by varying the frequency of a carrier wave; the older amplitude modulation or AM varies the amplitude of the carrier, with its frequency remaining constant.
How far can FM radio transmit?
Medium frequency (MF).
The MF range is from 300 to 3,000kHz. MF propagates by ground wave, direct wave, and sky wave. MF can span from 100 to 1,000 miles by ground wave and from 1,000 to 3,000 miles by sky wave, depending on the transmitter output power and the atmospheric conditions.
How can I transmit FM radio to my phone?
Some Android phones come with built-in FM transmitter functionality, in which case you can use this natively or with a free app such as Quick FM Transmitter and then broadcast the MP3 and other audio files on your phone to your car radio.
How does AM and FM radio work?
The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied.
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.
How far will an 8 watt radio transmit?
Most airband radios are 5 – 8 watts and typically have a range of around 200 miles.
How far will a 100 watt FM transmitter reach?
If 100 Watt ERP is used, it’s very likely that 20 kilometer of range will be reached because 100 Watt ERP is able to propagate a strong signal 20 kilometer. If 1000 Watts of ERP power is used, it is very provably the signal will reach 20 kilometer, but moreover it will helps to penetrate eventual obstacles.
How do I know if my phone has FM radio?
Check if you have an FM Radio chip
- Samsung: On some Samsung phones you can use the code * # 0 * # in the phone app.
- Xiaomi: For product phones you must write code * # * # 64844 # * # * in the phone app.
- Sony: Code to use on Sony * phones # # # 7378423 # * # *
How can I listen to radio without using data?
To listen to FM radio without data, you need a phone with a built-in FM radio chip, an FM radio app, and earbuds or headphones. NextRadio is a good Android app that lets you listen without data (if the phone has an FM chip) and includes a basic tuner.
How do I get radio stations on my phone?
Find your favorite radio stations
- On your phone, click on the App Store (for iPhone users) or Google Play (for Android users)
- Search for “iHeartRadio” or simply “radio apps”
- Find one you like and click download (be careful, not all of them are free)
What is the least used FM frequency?
The lowest and almost-unused channel, channel 200, extends from 87.8 MHz to 88.0 MHz; thus its center frequency is 87.9 MHz. Channel 201 has a center frequency of 88.1 MHz, and so on, up to channel 300, which extends from 107.8 to 108.0 MHz and has a center frequency of 107.9 MHz.
Which is better AM or FM?
FM is less prone to interference than AM. However, FM signals are impacted by physical barriers. FM has better sound quality due to higher bandwidth. … In AM radio broadcasting, the modulating signal has bandwidth of 15kHz, and hence the bandwidth of an amplitude-modulated signal is 30kHz.
What is the advantage of FM over AM?
The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. to man made interference. Smaller geographical interference between neighboring stations. Less radiated power.