In a typical plan position indicator ( PPI ) radar with a rotating antenna, this will usually be seen as a " sun " or " sunburst " in the centre of the display as the receiver responds to echoes from dust particles and misguided RF in the waveguide.

Before cable-ready TV sets became common in the late 1980s, an electronic tuning device called a cable converter box was needed to receive the additional analog cable TV channels and transpose or convert the selected channel to analog radio frequency ( RF ) for viewing on a regular TV set on a single channel, usually VHF channel 3 or 4.

Such devices, called analog multipliers, exist and are used as mixers at lower frequencies, but do not function well at the RF frequencies where heterodyning is usually used.

For a transmitter, the attack-time delay is defined as the interval from the instant the transmitter is keyed-on to the instant the transmitted RF signal amplitude has increased to a specified level, usually 90 % of its key-on steady-state value.

SINAD is usually expressed in dB and is quoted alongside the receiver RF sensitivity, to give a quantitative evaluation of the receiver sensitivity.

In satellite dishes, part of the receiver electronics, the RF front end, is usually mounted in a box just behind the feed horn.

Technically, RF modulation usually means combining the data with a carrier wave at a standardized frequency.

Outside Europe, separate RCA connectors are usually used, supplemented by RF connectors for backward compatibility and simplicity.

Rather, it is the measure of the bandpass characteristics of the stages preceding the IF amplifier, which will consist of RF bandpass filters and usually an RF amplifier stage or two.

It is usually disadvantageous to reduce the gain of the RF front end of the receiver on weaker signals as low gain can worsen signal-to-noise ratio and blocking ; therefore, many designs reduce gain only for stronger signals.

An RF anechoic chamber is usually built into a screened room, designed using the Faraday cage principle.

ANA, APLA, Anti-dsDNA, RF are usually negative, and may help in differentiating from SLE.

Nonlinear effects like the I-V-characteristic of the boundary sheath are utilized for Langmuir probe measurements but they are usually neglected for modelling of RF discharges due to their very inconvenient mathematical treatment.

RF based meter reading usually eliminates the need for the meter reader to enter the property or home, or to locate and open an underground meter pit.

A traveling-wave tube ( TWT ) is a specialised vacuum tube that is used in electronics to amplify radio frequency ( RF ) signals to high power, usually as part of an electronic assembly known as a traveling-wave tube amplifier ( TWTA ).

The F connector is a coaxial RF connector commonly used for " over the air " terrestrial television, cable television and universally for satellite television and cable modems, usually with RG-6 / U cable or, in older installations, with RG-59 / U cable.

Once the system is evacuated and sealed, the material is heated, usually by RF induction heating, and evaporates, depositing itself on the walls to leave a coating.

Receiving these very weak return signals, again involves the use of high gain antennas ( usually the same ones used to transmit the signal ) and a very low noise front end RF amplifier and a frequency stable receiver.

A Tuner is a subsystem that receives radio frequency ( RF ) transmissions like radio broadcasts and converts the selected carrier frequency and it's associated bandwidth into a fixed frequency that is suitable for further processing usually because a lower frequency is used on the output.

Such units were primarily defensive and although there were examples of RF and PF units successfully defending themselves, they rarely conducted offensive operations ; even when they did these operations were usually limited and lacked initiative or aggression.

Although function generators cover both audio and RF frequencies, they are usually not suitable for applications that need low distortion or stable frequency signals.

Clutter refers to radio frequency ( RF ) echoes returned from targets which are uninteresting to the radar operators.

Very low frequency or VLF refers to radio frequencies ( RF ) in the range of 3 to 30 kHz.

Very low frequency or VLF refers to radio frequencies ( RF ) in the range of 3 kHz to 30 kHz and wavelengths from 10 to 100 kilometres.

Low frequency or low freq or LF refers to radio frequencies ( RF ) in the range of 30 kHz – 300 kHz.

Medium frequency ( MF ) refers to radio frequencies ( RF ) in the range of 300 kHz to 3 MHz.

Rain fade refers primarily to the absorption of a microwave radio frequency ( RF ) signal by atmospheric rain, snow or ice, and losses are especially prevalent at frequencies above 11 GHz.

When discussing what RF Video refers to as " infamous one finger pin with Hogan ", Nash said that Goldberg was the one who caused that rumor to be spread and that he had not begun booking until February 1999.

The term usually refers to a type of radio-frequency ( RF ) power amplifier, some of which have output power measured in kilowatts, and are used in amateur radio.

A quadrupole ion trap or quadrupole ion storage trap ( QUISTOR ) exists in both linear and 3D ( Paul Trap, QIT ) varieties and refers to an ion trap that uses constant DC and radio frequency ( RF ) oscillating AC electric fields to trap ions.

Royalty-free, or RF, refers to the right to use copyrighted material or intellectual property without the need to pay royalties for each use or per volume sold, or some time period of use or sales.

Electrical applications for mail include RF leakage testing and being worn as a faraday cage suit by tesla coil enthusiasts and high voltage electrical workers.

* RF current does not penetrate deeply into electrical conductors but tends to flow along their surfaces ; this is known as the skin effect.

A coaxial RF connector is an electrical connector designed to work at radio frequencies in the multi-megahertz range.

Such signals can be electrical, RF, sonar, etc., depending on the equipment to be tested.

* The shield of a screened cable, such as USB cables or the coaxial cable used for cable television, protects the internal conductors from external electrical noise and prevents the RF signals from leaking out.

ERP takes into consideration transmitter power output ( TPO ), transmission line attenuation ( electrical resistance and RF radiation ), RF connector insertion losses, and antenna directivity, but not height above average terrain ( HAAT ).

RF anechoic chambers are normally designed to meet the electrical requirements of one or more accredited standards.

* Measuring receivers ( also: measurement receivers ) are calibrated laboratory-grade devices that are used to measure the signal strength of broadcasting stations, the electromagnetic interference radiation emitted by electrical products, as well as to calibrate RF attenuators and signal generators.

The Smith chart, invented by Phillip H. Smith ( 1905 – 1987 ), is a graphical aid or nomogram designed for electrical and electronics engineers specializing in radio frequency ( RF ) engineering to assist in solving problems with transmission lines and matching circuits.

The various services are encoded, modulated and upconverted onto radio frequency ( RF ) carriers, combined onto a single electrical signal and inserted into a broadband optical transmitter.

RF amplifiers are used at intervals to overcome cable attenuation and passive losses of the electrical signals caused by splitting or " tapping " the coaxial cable.

The cyclotron beam properties and capabilities have improved over the years as a result of systems upgrades and the fundamental infrastructure providing the magnetic and electrical fields and the RF resonators as well as the vacuum vessel will serve TRIUMF for many more years.

Audio engineering and RF engineering are also essential parts of broadcast engineering, being their own subsets of electrical engineering.

** RF connectors, a type of electrical connectors designed to work at radio frequencies

A variety of studies over the past 50 years have been done on workers exposed to high RF radiation levels ; studies including radar laboratory workers, military radar workers, electrical workers, and amateur radio operators.

Luxim's LIFI, or light fidelity lamp, claims 120 lumens per RF watt ( i. e. before taking into account electrical losses ).

Properly designed and constructed copper RF shielding enclosures satisfy most RF shielding needs, from computer and electrical switching rooms to hospital CAT-scan and MRI facilities.

In this technique the fibroid is shrunk by inserting a needle-like device into the fibroid through the abdomen and heating it with radio-frequency ( RF ) electrical energy to cause necrosis of cells.

Similar to electrical switches, RF and microwave switches come in different configurations providing the flexibility to create complex matrices and automated test systems for many different applications.

The high Radio frequency | RF voltage on the mast can deliver a dangerous electrical shock to anyone touching it, so the base is surrounded by a fence to prevent access.