ORFS stands for Output RF Spectrum, where 'RF' stands for Radio Frequency. The acronym ORFS is used in the context of mobile communication systems, e...

spectrum EMF measurement Frequency allocation Frequency modulation (FM) Plastic welding Pulsed electromagnetic field therapy Radio astronomy Spectrum...

high frequency (EHF) is the International Telecommunication Union designation for the band of radio frequencies in the electromagnetic spectrum from 30...

two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band. Citizens band is distinct from other personal radio service...

Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation...

Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW). There is no official definition of the band range, but it always...

much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges;...

Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 Hertz (Hz) and 300 gigahertz (GHz)...

voltages needed to produce the required power output. An electronic oscillator circuit to generate the radio frequency signal. This usually generates a sine wave...

A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument. The primary use is to...

receiver, the incoming radio frequency signal (at frequency f I N {\displaystyle f_{IN}} ) from the antenna is mixed with the VFO output signal tuned to f...

Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In...

defined antennas are the enablers of cognitive radio. Superheterodyne receivers use a VFO (variable-frequency oscillator), mixer, and filter to tune the desired...

same power output. In addition, the occupied spectrum is less than half that of a full carrier AM signal. SSB reception requires frequency stability and...

and general audio (in the audio spectrum). FM radio stations use the very high frequency range of radio frequencies. Throughout the world, the FM broadcast...

using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude...

Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with...

longwave range, and between 526 and 1706 kHz in the medium frequency (MF) range of the radio spectrum. AM broadcasting is also permitted in shortwave bands...

structure). In radio and telecommunications, the frequency spectrum can be shared among many different broadcasters. The radio spectrum is the part of...

interface. S-FSK (spread frequency-shift keying) is a modulation scheme that combines some of the advantages of classical spread-spectrum modulation (immunity...

Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the...

detecting a frequency-modulated signal in a receiver produces a noise spectrum that rises in frequency (a so-called triangular spectrum). Without preemphasis...

baby monitors. FRS uses frequency modulation (FM) instead of amplitude modulation (AM). Since the UHF band has different radio propagation characteristics...

frequency response of a system is the quantitative measure of the magnitude and phase of the output as a function of input frequency. The frequency response...

Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths...

circuit board inside the LNB's shielded box for processing. The lower frequency IF output signal emerges from a socket on the box to which the coaxial cable...

authority to use frequency coordinators to assist in developing and managing the Private Land Mobile Radio (PLMR) spectrum. Frequency coordinators, in...

high frequency (SHF) is the ITU designation for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also...

passband signal). Almost the whole available frequency band can be used. OFDM generally has a nearly 'white' spectrum, giving it benign electromagnetic interference...

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to electrons making...