to shift the frequency of information signal ,at the frequency domain to a higher frequency ...so the information can be transmitted to the receiver.
Following are the 3 parameter by which high Frequency carrier can be varied by low frequency intelligence signal 1) Amplitude 2) Phase 3) Frequency
Transmission bandwidth depends on modulating signal frequency and carrier frequency
communications channel
In an underground cable, the distortion in the transmission of carrier frequency can be eliminated using inductive loading. This distortion causes a delay which will result into a variance of frequencies.Ê
Some advantages are:As the frequency increases, the so does the data transfer speeds.The gain and directivity of the transmission antenna will increase for the the same size.Although signals experience more attenuation at high frequency, this could be advantageous for covert purposes.Ultimately, each band has certain limitations, depending on what the FCC has them dedicated for. So higher frequency could be great, but could be power limited.
Yes, a linear combination of a low-frequency intelligence signal and a high-frequency carrier signal can be effective for radio transmission. This method, known as amplitude modulation (AM) or frequency modulation (FM), allows the low-frequency signal to be transmitted over longer distances by utilizing the high-frequency carrier wave. The carrier wave effectively "carries" the information, enabling it to be received and demodulated by appropriate receivers. This technique is fundamental in broadcasting and communication systems.
audio frequency
The relationship between antenna length and frequency is that shorter antennas are more effective at receiving and transmitting higher frequency signals, while longer antennas are better for lower frequency signals. This is because the length of the antenna needs to be proportional to the wavelength of the signal for optimal reception and transmission.
Following are the 3 parameter by which high Frequency carrier can be varied by low frequency intelligence signal 1) Amplitude 2) Phase 3) Frequency
The Ratio Detector recovers intelligence from the FM envelope by comparing the amplitudes of two signals derived from the FM waveform. It utilizes a phase-locked loop to demodulate the frequency variations, effectively translating frequency changes into amplitude changes. By taking the ratio of these amplitudes, the detector can extract the original modulation signal, allowing for effective demodulation of the frequency-modulated signal. This method is particularly effective in reducing the effects of noise and improving the clarity of the recovered audio.
One method to extract the intelligence (signal) from a high frequency carrier in FM receivers is with a phase locked loop.
Higher the frequency, higher the losses.
Frequency modulation is not used for long distance transmission because it has the problem of limited band width.
Transmission bandwidth depends on modulating signal frequency and carrier frequency
GPS uses radio frequency signals in the L1 (1575.42 MHz) and L2 (1227.60 MHz) bands for its signal transmission.
If the intelligence signal striking a microphone was doubled in frequency from 1 kHz to 2 kHz with constant amplitude, (fc) would change from 1 kHz to 2 kHz. Because the intelligence amplitude was not changed, however, the amount of frequency deviation above and below fc will remain the same. On the other hand, if the 1 kHz intelligence frequency were kept the same but its amplitude were doubled, the rate of deviation above and below fc would remain at 1 kHz, but the amount of frequency deviation would double.
at microwave frequency why should the transmission line may considered to be made of unit length?