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RF signals are generally described as alternating current electical signals with a frequency range starting just above the highest frequency that can be heard, about 20,000 cycles per second, and going as high as 10,000,000,000,000 cycles per second, which is considered to be in the lowest region of infrared light/radiation. These are electrical and electromagnetic signals carried in wire, waveguides, through the air, or in space.
The answer is vague, and so is the question. Here are some examples of everyday RF signals:
10 to 80 KHz range used by governments to communicate with submarines.
90 to 110 KHz signals used by the old LORAN navigation system.
530-1700 KHz band, approximately, as used for AM /broadcast entertainment radio.
3000 to 30,000 KHz (3 to 30 MHz) range of RF signals, commonly called the "shortwave radio band".
27.185 MHz is CB radio channel 19 in the uSA.
88 to 108 MHz as used by FM broadcast radio in the USA.
300 to 500MHz as very commonly used by city, fire, military, and police.
2500 to 30,000 MHz (2 to 30 GHz) used by satellites.
Higher than 50 GHz is mostly experimental and military.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agorf radio frequency
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Difference between IF and RF signal?
RF signal is coming from an antenna. So it contains electromagnetic waves. But when the signal is processed using electronics circuits, the range of frequency may not be sufficient. So that RF has to be convert to some other frequency acceptable by the circuit. And IF is the intermediate frequency used for tuning & other purpose.
How does frequency modulation work?
Frequency modulation (FM) works by taking a signal, such as an audio signal, and using it to modulate a higher frequency (Radio Frequency, RF) carrier. This modulation causes the RF to shift up and down in frequency. The RF remains relatively constant in amplitude, and its shifting frequency represents the original signal.Contrast this with Amplitude Modulation (AM) where the RF is relatively constant in frequency, but its amplitude represents the original signal.In order to recover the original signal in an FM system, the receiver must demodulate the signal by measuring the time between successive waves of the RF. In a typical broadcast band system, limitations in the the design requirements for tuning the modulated carrier and for demodulating the original signal force the tuning and demodulation to be done in different stages. Using a process known as superhetrodyning, the tuner amplifies the RF with a broad-band amplifier and mixes the RF with a local oscillator (LO) frequency, converting the RF into an intermediate frequency (IF), typically 10.7 MHz. It then passes the still modulated IF (or shifted RF) into a sharp band-pass filter, the IF stage, and removes the interference of other stations from the IF signal. It then demodulates the original signal from the IF signal.Often, the original signal contains encoded information, such as a stereo subcarrier, which is subsequently demodulated and demultiplexed in order to recover the stereo signal. The question, however, asked about frequency modulation, so the answer stops here. If further detail is required, either add it by refining the answer, or comment on the question, and I or someone will refine the answer.
What is rf loop back?
RF Loop Back ,Usually used in all RF Transceivers to covert the Transmitted signal into the Receiver frequency ,checking the Overall performance of the Terminal .This is an Option useful only in maintenance and not recommended BY Standard Authorities (Fcc, ETSI, etc )
What are the differences between analog and RF circuits?
analog circuit is circuit that generates audio, sound, radio etc (waves of the natural world) RF stand for radio frequency, it is often refer to the property of signal transmission in high frequency (HF). If you say a circuit is RF, the circuit would be in the frequency range between 3kHz to 300GHz. The reason that RF circuit is special is because the performance of signals of higher frequency is different to other lower frequency AC circuits. When designing a RF circuit, RF engineers have to consider the type of wires, lengths, use of components, signal loss etc. It is because high frequency signals would take a piece of wire (longer than 1/10 of signal wavelength) as wires with many inductors and capacitors.
An RF amplifier amplifies the incoming signal by 200 times Calculate the power gain of this amplifier in dB?
If an RF amplifier amplifies the incoming signal by 200 times, the power gain of the amplifier is +25.9 dB. Power is proportional to voltage squared, so the power gain is 400. The decibel scale is 3 times log2 of the power change.
The of an antenna depends upon the frequency of the RF signal and the gain?
The size of an antenna depends upon the frequecny of the RF signal and the gain.
Is rf signal much more important for capturing or not?
rf is must for modulation and demodulation.
Is an rf power amplifier useful in the home?
The answer to whether an RF power amplifier is useful for your home depends on the qualifty if your equipment. If your T.V. is getting a weak signal for example, an RF power amplifier may be useful to get a better signal.
Where can one obtain an RF signal generator?
You can obtain a RF signal generator from a variety of locations. You can try your local electronics store. If they do not stock it you can try places such as Amazon or eBay.
What occurs whenever a reflected RF signal combines with the main signal?
It produces a high SWR (standing wave ratio) that limits the maximum RF (radio frequency) output.
What is the use detector in wireless communications?
The detector detect the audio signal in the received modulated RF signal, rectify it and filter the RF to ground and pass the pure audio to the next stage
Difference between IF and RF signal?
RF signal is coming from an antenna. So it contains electromagnetic waves. But when the signal is processed using electronics circuits, the range of frequency may not be sufficient. So that RF has to be convert to some other frequency acceptable by the circuit. And IF is the intermediate frequency used for tuning & other purpose.
What is a RF amplifier?
A RF amplifier is a device for electrically amplifying the power of an electrical signal, typically, but not exclusively, radio frequency signals.
How you take signal from sky?
Using an Antenna and Receive RF Chain
What is resonating frequency?
It is a the RF output of a transmitter that is tuned to a distanced receiver, it have to be in resonance with the transmitter signal to be able to receive the signal
What is error 9 on rdc634 clarion CD player?
Error 9 on that particular changer is a weak RF signal error. That means that the unit is not sending out a strong enough signal to the antenna. Error 9 on that particular changer is a weak RF signal error. That means that the unit is not sending out a strong enough signal to the antenna.
How do you convert s video to composite video?
You need a RF modulator to convert the signal to a (RF) TV channel. The audio and video quality will be lower doing this.
