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Frequency to which a carrier wave is shifted during transmission or reception
intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. The intermediate frequency
Intermediate_frequency
Intermediate-frequency (IF) amplifiers are amplifier stages used to raise signal levels in radio and television receivers, at frequencies intermediate
Intermediate-frequency amplifier
Intermediate-frequency_amplifier
Type of radio receiver
incoming radio-frequency (RF) signals to a fixed intermediate frequency (IF). The signal is then amplified and filtered at that fixed frequency. This arrangement
Superheterodyne_receiver
Type of radio design
direct-conversion receiver (DCR), also known as a homodyne, synchrodyne, zero intermediate frequency receiver (zero-IF receiver), is a radio receiver design that demodulates
Direct-conversion_receiver
Oscillator used in radio receivers
superheterodyne receiver the different frequencies of the different stations are all translated to the same intermediate frequency (IF) by the mixer, modern BFOs
Beat_frequency_oscillator
Electromagnetic frequencies ranging from 3 kHz to 300 GHz
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical
Radio_frequency
Circuit that creates new frequencies from two signals
receiver is a mixer used to move received signals to a common intermediate frequency. Frequency mixers are also used to modulate a carrier signal in radio
Frequency_mixer
Signal processing technique
oscillator (LO) to produce a lower fixed frequency signal called the intermediate frequency (IF) signal. The IF signal is amplified and filtered and then applied
Heterodyne
Electronic method of transmitting information with a carrier wave
angle modulation; phase modulation is often used as an intermediate step to achieve frequency modulation. These methods contrast with amplitude modulation
Frequency_modulation
Method in digital signal processing
the intermediate frequency (IF). Multiplication of the DDS frequency with the input signal creates images centered at the sum and difference frequency (which
Digital_down_converter
Receiving device on satellite dishes
LNB is a combination of low-noise amplifier, frequency mixer, local oscillator and intermediate frequency (IF) amplifier. It serves as the RF front end
Low-noise_block_downconverter
Sensor used by the police to detect radar detectors
such emissions (usually the frequency of the radar type being detected, plus about 10 MHz for the intermediate frequency). Some radar guns are equipped
Radar_detector_detector
Device for receiving radio transmissions
radio frequency signal from the antenna is shifted down to a lower "intermediate frequency" (IF), before it is processed. The incoming radio frequency signal
Radio_receiver
Broadcasting of television using artificial satellites
oscillator with some filter circuitry) for downconversion to an intermediate frequency. The channel selection was controlled typically by a voltage-controlled
Satellite_television
1954 commercial transistor radio
transformers for the intermediate frequency amplifiers and a miniature audio transformer for the loudspeaker. The intermediate frequency transformers are
Regency_TR-1
Radio receiver subsystem
signal at the original incoming radio frequency (RF), before it is converted to a lower intermediate frequency (IF). In microwave and satellite receivers
RF_front_end
Electromagnetic spectrum 300–3000 MHz
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
Ultra_high_frequency
Synchronisation signal in colour video
is also how FM radio circuits came to use a nominally 10.7 MHz intermediate frequency in superheterodyne conversion. Camera control unit Color framing
Color_burst
Device which extracts info from a modulated radio frequency current or voltage
difference frequencies to the signals being mixed, just as a first mixer stage in a superhet would produce an intermediate frequency; the beat frequency in this
Detector_(radio)
Electronic device
cycloconverter is a direct frequency changer because it uses no intermediate stages. A cycloconverter can only provide a lower frequency at its output. Another
Frequency_changer
Oscillator used to change Signal frequency in electronics
The difference can then be filtered from the sum to extract the intermediate frequency (IF). For high-side injection, f I F = f L O − f R F {\displaystyle
Local_oscillator
Radio communication system implemented in software
receiver uses a variable-frequency oscillator (VFO), a mixer, and a filter to tune the desired signal to a common intermediate frequency (IF) or baseband. Typically
Software-defined_radio
Branch of astronomy using gravitational waves
interference, the lack of ultra-sensitive instruments, and the detection of low-frequency waves. Ground-based detectors face problems with seismic vibrations produced
Gravitational-wave_astronomy
Electromagnetic wave range of 30–300 MHz
one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF). VHF
Very_high_frequency
Measurement of the power in a radio signal
the measurement available to users. RSSI is often derived in the intermediate frequency (IF) stage before the IF amplifier. In zero-IF systems, it is derived
Received signal strength indicator
Received_signal_strength_indicator
Frequencies used by electrical components
wide range of frequencies, from a few kilohertz up to several hundred megahertz. Many applications call for a crystal oscillator frequency conveniently
Crystal oscillator frequencies
Crystal_oscillator_frequencies
Electronic filter
radio operators also build crystal filters for superheterodyne intermediate-frequency and single-sideband equipment. In 1880, Pierre and Jacques Curie
Crystal_filter
Types of electrical transformer
varying the coupling (mutual inductance). One common form is the IF (intermediate frequency) transformer, used in superheterodyne radio receivers. They are
Transformer_types
Topics referred to by the same term
Intelligent falling, a satirical "alternative theory" of gravitation Intermediate frequency, in radio transmission or reception Internal focusing, a lens technology
If
Type of modem
has intermediate frequency (IF) output (that is, 50-200 MHz), however, sometimes the signal is modulated directly to L band. In most cases, frequency has
Satellite_modem
Electronic method of transmitting information with a carrier wave
front end that produces a frequency-shifted version of the radio frequency (RF) signal within a standard intermediate frequency (IF) band. To recover the
Single-sideband_modulation
Type of receiver design for radio signals
In a low-IF receiver, the radio frequency (RF) signal is mixed down to a non-zero low or moderate intermediate frequency (IF) in the range of a few hundred
Low_IF_receiver
Device for broadcasting television signals
modulator, where it modulates an intermediate frequency carrier (IF). The modulation technique is usually frequency modulation (FM) with a typical maximum
Television_transmitter
Mathematical technique for manipulating signals
data is used to modulate a carrier frequency, which may be faster (e.g. Gigahertz, perhaps an intermediate frequency). As well as within a transmitter
In-phase and quadrature components
In-phase_and_quadrature_components
Electronic testing device
analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument. The primary use is to measure the
Spectrum_analyzer
Type of electromagnetic field therapy
is a type of electromagnetic field therapy using low-intensity, intermediate frequency electrical fields to treat cancer. TTFields disrupt cell division
Alternating electric field therapy
Alternating_electric_field_therapy
Visible difference in brightness or color
which contrast is reduced. Recent studies have demonstrated that intermediate-frequency sinusoidal patterns are optimally-detected by the retina due to
Contrast_(vision)
Miniature adjustable component
superheterodyne radio and television receivers, in the intermediate frequency (IF), oscillator and radio frequency (RF) circuits. They are adjusted into the right
Trimmer_(electronics)
Frequency range
the service in January 2018. The band is also used as a transmit intermediate frequency in satellite communications as a replacement for L band where a
S_band
Transmitters using intermediate frequency
transmitter is a radio or TV transmitter which uses an intermediate frequency signal in addition to radio frequency signal. There are two types of transmitters.
Superheterodyne_transmitter
Sound wave which travels along the surface of an elastic material
to superhet applications. This is because the intermediate frequency signal is always at a fixed frequency after the local oscillator has been mixed with
Surface_acoustic_wave
Frequency in atomic physics
The Rabi frequency Ω {\displaystyle \Omega } is the frequency at which the probability amplitudes of two atomic energy levels fluctuate in an oscillating
Rabi_frequency
Range of frequencies occupied by an unmodulated signal
processing, baseband is the range of frequencies occupied by a signal that has not been modulated to higher frequencies. Baseband signals typically originate
Baseband
Circuit for shortwave receivers to improve reception
first oscillator with the received signal in a frequency mixer to translate it to an intermediate frequency that is above the receiver's tuning range, Mixing
Wadley_loop
Device used in the transmission of satellite signals
70 MHz intermediate frequency (IF) to Ku band or C band. Most BUCs use phase-locked loop local oscillators and require an external 10 MHz frequency reference
Block_upconverter
Tables of radio frequencies assigned to television channels
The following tables show the frequencies assigned to analog broadcast television channels in various regions of the world, along with the ITU letter
Television channel frequencies
Television_channel_frequencies
Baseband analog video signal format
source] The frequency spectrum of the modulated color signal overlaps that of the baseband signal, and separation relies on the fact that frequency components
Composite_video
Adaptive algorithm
typically received by the antenna, amplified, down-converted to an intermediate frequency, and then passed through detector circuitry that extracts the envelope
Constant_false_alarm_rate
Television that uses analog signals
a tuner which selects a television channel and frequency-shifts it to a fixed intermediate frequency (IF). The signal amplifier performs amplification
Analog_television
Multiple converters working in parallel
local oscillator to produce an intermediate frequency (IF) signal. This process, known as heterodyning, shifts the frequency of the received signal to a
Time-interleaved_ADC
Oscillator whose frequency can be tuned over some range
output signal tuned to f L O {\displaystyle f_{LO}} , producing an intermediate frequency (IF) signal that can be processed downstream to extract the modulated
Variable-frequency_oscillator
Ultra high frequency radio to transmit TV
became evident. One was poor image frequency rejection in superheterodyne receivers with the standard intermediate frequency of 45.75 MHz. Another was very
UHF_television_broadcasting
Electromagnetic radiation with wavelengths from 1 m to 1 mm
front end of receivers, and signals were heterodyned to a lower intermediate frequency for processing. The period from the 1970s to the present has seen
Microwave
Performance measure in radio electronics
the incoming radio frequency (RF), generating sum and difference frequencies. One of these will be at the intermediate frequency (IF), and will be selected
Image_response
Study of electromagnetic fields and biological entity interaction
apoptosis, and tumor growth. Electromagnetic radiation in the intermediate frequency range has found a place in modern medical practice for the treatment
Bioelectromagnetics
received from a satellite dish or television antenna into user-defined intermediate frequency (IF) channels, allowing multiple receivers to share a single coaxial
Cable_router
Signal processing sample technique
rates. Important signals of this sort include a radio's intermediate-frequency (IF), radio-frequency (RF) signal, and the individual channels of a filter
Undersampling
Vacuum tube with four active electrodes
the super-sonic heterodyne receiver, because the intermediate frequency was at an ultrasonic frequency) was invented in France by Lucien Levy in 1917 (p
Tetrode
Radio receiver with amplifier stages and a detector
superheterodyne receiver translates the incoming high radio frequency to a lower intermediate frequency which does not change. The problem of achieving constant
Tuned radio frequency receiver
Tuned_radio_frequency_receiver
quality of the received signal. Typically this is a network in the intermediate frequency section of the receiver; when a pulse of noise passes through the
Noise_blanker
Frequency mixer of a superhet radio
were able to take an incoming RF signal and change its frequency to a fixed intermediate frequency, which was then amplified and detected in the remainder
Pentagrid_converter
the BFO signal beats with the fixed intermediate frequency, so the beat frequency oscillator can be a fixed frequency. Armstrong later used Fessenden's
History_of_radio_receivers
Portable radio transceiver
Receiver sensitivity: 0.7 μV Receiver selectivity: 80 kHz @ −6 dB Intermediate frequency: 4.3 MHz Transmitter RF output: 0.9 watts Circuitry: 16 vacuum tubes
AN/PRC-10
Production of voltage by a varying magnetic field
used at higher than power frequency, for example, those used in switch-mode power supplies and the intermediate frequency coupling transformers of radio
Electromagnetic_induction
Nerve carrying auditory information from the inner ear to the brain
the dorsal cochlear nucleus. The axons from the intermediate frequency region project to intermediate targets. Through this process, a spatial representation
Cochlear_nerve
mixer (which normally contains an amplifier) to limit the first intermediate frequency (IF) stage's passband. It prevents overloading later amplifier stages
Roofing_filter
Archaeogenetic name for an ancestral genetic component
groups. The high relative-frequency of the blue-eye color allele in SHGs, resembles WHG, while the intermediate frequencies of the skin color determining
Scandinavian_hunter-gatherer
Color encoding system for analogue television
colour subcarrier frequency. Exact colour subcarrier frequency of PAL-M is 3.575611 MHz, or 227.25 times System M's horizontal scan frequency. Almost all other
PAL
Signals broadcast by GPS satellites
down converted to baseband or intermediate frequency, filtered (to remove frequencies outside the intended frequency range for the digital signal that
GPS_signals
Brightness in an image or video
bandwidth, coupled with high frequency chroma components, can cause visible errors in luminance. An example of a high frequency chroma component would be
Luma_(video)
Two-stage amplifier in an electronic circuit
signals are multiplied by the mixer, and the difference frequency, the intermediate frequency, is taken from the upper drain of the cascode mixer. This
Cascode
Method of communication by radio waves
with the constant intermediate frequency (IF) produced by the superheterodyne's detector. Therefore, the BFO could be a fixed frequency. Continuous-wave
Wireless_telegraphy
Portable radio receiver
combination mixer-oscillator, one as an audio amplifier, and two as intermediate-frequency amplifiers." One year after the release of the TR-1 sales approached
Transistor_radio
Audible feedback to the speaker using a telecommunications system
converted to the intermediate frequency (IF), then mixed with the beat frequency oscillator (BFO) frequency to generate a difference frequency, which is audible
Sidetone
Topics referred to by the same term
electrical connector without applying force to the connector Zero Intermediate Frequency, a radio demodulation technique Zeolitic imidazolate frameworks
ZIF
WWII radio guided bomb developed by Nazi Germany
203/230 radio link on a Fritz X, by jamming the Straßburg receiver's intermediate frequency (IF) section. The FuG 230 receiver's IF section operated at 3 MHz
Fritz_X
American radio with 5 vacuum tubes
series strings using 300 mA heaters were: Detector-Oscillator: 78 Intermediate Frequency (IF): 78 Second Detector and First Audio Amplifier: 77 Power Amplifier:
All_American_Five
Type of adjustable-speed drive
A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable
Variable-frequency_drive
Colour in an image or video
subcarrier frequency. Depending on the video standard, the chrominance subcarrier may be either quadrature-amplitude-modulated (NTSC and PAL) or frequency-modulated
Chrominance
device primarily used for the alignment of receiver or transmitter intermediate frequency strips. It is usually used in conjunction with an oscilloscope,
Wobbulator
Alteration of the original shape of a signal
radio frequency applications is rarely expressed as THD. Non-flat frequency response is a form of distortion that occurs when different frequencies are
Distortion
When multiple copies of a beneficial mutation become established and fix together
single beneficial mutation may carry multiple haplotypes to an intermediate frequency, while itself becomes fixed. Another model happening when multiple
Soft_selective_sweep
consideration of different carrier frequencies. After the conversion to an intermediate frequency, the signal is filtered in order to band-limit the signal and prevent
Vector_signal_analyzer
Family of digital modulation methods
property is that the modulations are low-frequency/low-bandwidth waveforms compared to the carrier frequency, which is known as the narrowband assumption
Quadrature amplitude modulation
Quadrature_amplitude_modulation
Satellite radio service owned by SiriusXM
satellite and terrestrial signals at 2.315 GHz and downconverts them to intermediate frequency signals at around 75 MHz. The strength of the signals is approximately
Sirius_Satellite_Radio
the information signal should be demodulated or converted to an intermediate frequency in the outside receiver, and then modulated/shifted back in the
Tunnel_transmitter
Form of signal modulation using time shifts
extract the information from the received radio signal through its intermediate frequency section, then demultiplex the separate channels from the serial
Pulse-position_modulation
Circuit added to a radio receiver to improve its selectivity and sensitivity
receivers of the 1950s. With the advent of crystal and ceramic intermediate frequency filters, the Q-multiplier was no longer popular. Q meter Joseph
Q_multiplier
signal to an intermediate frequency that is one-half the received RF signal frequency. The second switching stage mixes the intermediate frequency to baseband
Harmonic_mixer
Claimed sensitivity to electromagnetic fields
against such an association." But "data on the health effects of intermediate frequency fields used, for example, in metal detectors or anti-theft devices
Electromagnetic hypersensitivity
Electromagnetic_hypersensitivity
dielectric behavior at low and high frequency regimes is independent of frequency. At intermediate frequencies, a very broad range of heterogeneous materials
Universal_dielectric_response
Broadcasting method
system. In TV transmitters, both AF and VF modulate intermediate frequency (IF) carriers. (The frequency difference between the two carriers is 4.5 MHz in
Intercarrier_method
Type of transmitter in telecommunications
input mixer or down-converter shifts the radio-frequency (RF) signal down to an intermediate-frequency (IF) signal. A second mixer (known as output mixer
Transposer
Van used to detect the presence of a television set
broadness of the TV transmission bands, and variations in the intermediate frequencies used, a detector receiver could have needed to be tunable between
TV_detector_van
Television content transmitted via signals in the air
Terrestrial television stations broadcast on television channels with frequencies between about 52 and 600 MHz in the VHF and UHF bands. Since radio waves
Terrestrial_television
(III) 3.30 - 5.58 MHz (IV) 5.58 - 9.20 MHz (V) 9.20 - 15.0 MHz Intermediate frequency: 465 kHz Sensitivity for a signal to noise ratio of 3:1 and voltage
R-311_(radio)
Radio station in Salina, Kansas, United States
was exactly on the second harmonic of radios with a 455 kHz IF (intermediate frequency). This resulted in an annoying tone or whistle in the background
KINA
radio transceiver Receiver section: Superheterodyne design with an intermediate frequency of 750 kHz, consisting of five miniature valves type 1Ж29Б Transmitter
R-350M
Tool measuring EM radiation at 0.3–300-GHz frequency
antenna system, microwave radio-frequency components (front-end) and a back-end for signal processing at intermediate frequencies. The key element is the Dicke
Microwave_radiometer
Radio communications receiver
Hallicrafters company in the 1960s. The SX-117 was a triple conversion intermediate frequency receiver designed to cover the 10 meter to 80 meter amateur radio
Hallicrafters_SX-117
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