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Analog radio uses either amplitude modulation (AM) or frequency modulation (FM) to carry an audio signal.
AM signals can be received at greater distances than FM but they suffer from interference from other stations and a wide range of electro-magnetic sources. FM signals offer better quality with less interference than is typically found with an AM signal. The transmission range is far smaller than AM. For a wide geographic coverage, multiple transmitters are needed although the limited range also makes FM an ideal medium for local stations where long range is undesirable.
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Will an FM signal reach outer space?
Yes, FM does travel in space. In fact I believe that at least some space communication utilizes FM signals (data and voice).
Why are FM tones used in ASSR?
boz there is lesas interferance to the signal as a signal travels...............
Why power amplifier used in FM transmitter?
Amplifier is used in an FM transmitter to increase the level of a signal suitable for transmission
What is an Integrated FM modulator?
A device that will allow you to send a FM signal. Usually used for mp3 or satelite radio players. You can set the modulator to a channel then your radio to the same channel and pick up the signal.
What does fm and am stand for?
AM-Amplitude modulated FM-Frequency modulated Explanation: The frequency and amplitude refer to the width and height of wavelengths in the radio waves that are used to transmit the signal. FM is usually a better signal than AM because the frequency of the waves is less distorted than amplitude.
Why AM is used to transmit picture iv TV?
There is no real reason. In the UK's old analogue system AM was used for picture and FM used for sound. In France they used the opposite system, FM for picture and AM for sound. Everything is going digital now, so does not apply, the RF signal is a FSK data signal.
Differentiate FM signal from AM signal?
FM = Frequency Modulation; AM = Amplitude Modulation; each being a technique by which the speech signal is imprinted onto the carrier signal (the one to which you tune the radio). FM is a higher frequency than AM. FM also only uses the 2.7hz upper side band of the frequency while AM utilizes the entire 6hz both the LSB, USB and the .6hz carrier wave. That allows AM to travel farther than a FM signal.
Why you convert FM signal to IF frequency?
Mix it with a local oscillator whose frequency is (the IF frequency) away from the frequency of the FM signal you're interested in.
Why inTV broadcasting video signal is trancemitted in AM but audio signal is in FM?
AM was used for the video signal because components to transmit and receive the video signal (tubes, originally) were not available that could modulate the frequency fast enough for the amount of information required for a video signal. The VHF band, where most of television broadcasts resided until the the adoption of Digital Television (DTV) was also being used for FM audio broadcasts.
Why am rather than FM in most used in mobile radio system?
FM and AM are both used in radio systems today. AM stands for amplitude modulation, and in AM radios, the signal goes farther but has more interference from objects and the weather. FM has a higher quality sound, and is used for its better music/sounds.
Why only AM but not FM used for transmitting video signal?
Because of video's complex nature, AM lends itself to transmitting several different signals simultaneously, like video, chroma, sync, etc. and it can provide the bandwidth required to do it easily. FM for the audio has a bandwidth of 100 khz, and FM is much better for that. It's also a `cleaner signal`, but the FM transmitter has limitations on how much information it can carry.
What does IF mean in an FM circuit?
IF stands for Intermediate Frequency. An intermediate frequency is a frequency which the primary signal or carrier signal signal is changed to in the process of reception or transmission. For example, an FM or frequency modulated radio or FM television tuner uses an intermediate frequency or IF of 10.7 megaHertz, abbreviated mHz. The primary signal of an FM radio may be between 88 to 108 mHz. This signal is processed to 10.7 mHz and then demodulated to an audio signal that human ears can hear. The reason for using an intermediate frequency is that it will not interfere with the primary or carrier frequency. Also, the lower IF frequency is easier to deal with electronically. Commonly used IF frequencies in FM are 10.7 and 5.5 mHz.AM or amplitude modulation commonly uses 455 kiloHertz although others frequencies may be used.
