- #1
jaydnul
- 558
- 15
then how can you tune into, say, 101.1 when its not at 101.1 MHz all the time given the frequency change?
TurtleMeister said:An FM radio receiver tuned to 101.1 Mhz is actually receiving a band of frequencies centered on 101.1 Mhz. I think the bandwidth for the FM broadcast band in the US is 20.5 Mhz. So a receiver tuned to 101.1 Mhz would actually be receiving frequencies in the range of 90.85 to 111.35 Mhz.
Bobbywhy said:...
Bandwidth of 200 kHz is not needed to accommodate an audio signal — 20 kHz to 30 kHz is all that is necessary for a narrowband FM signal. The 200 kHz bandwidth allowed room for ±75 kHz signal deviation from the assigned frequency, plus guard bands to reduce or eliminate adjacent channel interference. The larger bandwidth allows for broadcasting a 15 kHz bandwidth audio signal plus a 38 kHz stereo "subcarrier"—a piggyback signal that rides on the main signal. Additional unused capacity is used by some broadcasters to transmit utility functions such as background music for public areas, GPS auxiliary signals, or financial market data.”
http://en.wikipedia.org/wiki/Radio_broadcasting
FM radio stands for frequency modulation radio and is a method of transmitting audio signals over radio waves by varying the frequency of the electromagnetic (EM) wave.
FM radio works by using a transmitter to modulate the frequency of an EM wave with the audio signal. This modulated wave is then transmitted through the air and picked up by a receiver, which demodulates the wave to reproduce the original audio signal.
One advantage of FM radio is that it produces a high-quality, static-free sound. This is because the frequency modulation technique is less susceptible to interference from other sources compared to amplitude modulation used in AM radio.
Yes, FM radio signals can travel long distances. The range of an FM radio signal depends on various factors such as the transmitter power, antenna height, and terrain. In general, FM radio signals can reach distances of up to 70 miles.
Yes, FM radio is still widely used today for broadcasting music, news, and other audio content. It is also commonly used in emergency alert systems and for communication between aircraft and air traffic control. Despite the rise of digital audio platforms, FM radio remains a popular and reliable means of audio transmission.