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How is a carrier wave produced?
A carrier wave is produced by an electronic oscillator that generates a steady waveform at a specific frequency. This waveform serves as the base signal on which information is modulated for transmission in communication systems like radio and television. The carrier wave's frequency determines the bandwidth and reception quality of the transmitted signal.
What type of electromagnetic wave is used for television?
Television signals primarily rely on electromagnetic waves within the radio frequency range, specifically UHF (Ultra High Frequency) and VHF (Very High Frequency) bands. These waves are used to transmit audio and video information to TV antennas for reception by television sets.
What frequency does GPS use for its signal transmission?
GPS uses radio frequency signals in the L1 (1575.42 MHz) and L2 (1227.60 MHz) bands for its signal transmission.
What is the use of local oscillator?
Trasmitting stations have their own transmitting frequency. No one can construct an amplifier which amplifies signals over a wide range. So every transmitting frequency has to be changed to one particular frequency. This is known as INTERMEDIATE frequency (IF) This is quite possible by getting beats. So a signal is to generated whose frequency is just more than the incoming frequency by IF This signal is named as local singnal which is generated by the LOCAL oscillator.
How far can a radio signal travel and what factors influence its range?
A radio signal can travel long distances, potentially thousands of miles. The range of a radio signal is influenced by factors such as frequency, power of the transmitter, antenna height, atmospheric conditions, and obstacles in the signal path.
Why is electricity transmitted at low frequecies?
The higher the frequency, the shorter the signal travels with the same relative transmit power. With lower frequency the signal travels longer. That's why you can listen to radio's from around the world, but not tv transmissions.
How do you send a digital radio signal to a FM radio?
Frequency Modulation must have a carrier whereby the frequency can be modulated by the signal
What is channels to be non-overlapping?
Broadcast media AND OTHER RF COMMUNICATION use electromagnetic waves to send information across distance. An AM radio can use a very narrow frequency to send the information, but FM communications, such as television, your FM radio receiver and most digital signals, use what is called "frequency modulation" to send a signal. In a frequency modulated signal, the base sigal will start at a single frequency. To send information, the signal changes (modulates) the frequency up and/or down from that base frequency. The FCC and other regulating agencies have reserved certain frequencies for specific commercial broadcast use only. A radio signal may not "overlap" or attempt to use the frequency or any part of the frequency that has been assigned to another commercial broadcaster.
What is the difference between am raido and FM radio?
A: AM radio is an Amplitude Modulation transmission . Meaning it has fix frequency but it is modulated by the signal. FM Frequency Modulation the frequency is modulated by the signal
What exactly is a VHF radio used for?
It is used for sending wireless signals over the Very High Frequency band of radio. This band is mainly used for television signals. It can also be used to modulate a television signal in a single cable.
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.
What is a modulator along with a VCR?
Television signals are transmitted on a high frequency (or RF) carrier signal. The technique of adding the signal to the carrier signal is called modulation. This happens for all radio transmissions. A VCR that has a modulator allows the output signal to be turned into an RF signal. The signal is added to the RF signals that are fed into the VCR via the aerial feed. Although it is rarely needed today, older televisions often had no video or audio input so the VCR output could be sent to the television as RF to allow the tuner to capture and display the signal. Most VCR modulators have a control to adjust the carrier frequency to allow it to use a channel that is not use by other broadcast television signals. Modulators are used less often in recorders and players as virtually all televisions have at least one video input.
Why the linear combination of a low frequency intelligence signal and a high frequency carrier signal is not effective as a radio transmission?
to shift the frequency of information signal ,at the frequency domain to a higher frequency ...so the information can be transmitted to the receiver.
Relate energy of radio to frequency of wave?
Energy of radio signal E = hf, Planck's constant times the frequency.
What is the wave width of an FM radio wave?
2(frequency deviation+signal frequency)
How are radio and television waves added to em radio waves?
by changing the amplitude or frequency of the radio waves.
How are radio television signals added to EM radio waves?
by changing the amplitude or frequency of the radio waves.
