The NEXRAD Pulse-Doppler weather radar uses a symmetric antenna to perform detailed volumetric scans of the atmosphere.

This antenna uses a single mast insulated from ground and fed at the lower end against ground.

The term " broadcast network " is often used to distinguish networks that broadcast an over-the-air television signals that can be received using a tuner ( television ) inside a television set with a television antenna from so-called networks that are broadcast only via cable television ( cablecast ) or satellite television that uses a dish antenna.

A parabolic microphone is a microphone that uses a parabolic reflector to collect and focus sound waves onto a receiver, in much the same way that a parabolic antenna ( e. g., satellite dish ) does with radio waves.

The proposed device uses beam-powered propulsion in the form of a high-power microwave antenna pushing a sail.

A popular solution uses so-called traps consisting of parallel resonant circuits which are strategically placed in breaks along each antenna element.

The bandwidth characteristics of a resonant antenna element can be characterized according to its Q, just as one uses to characterize the sharpness of an L-C resonant circuit.

The receiver uses different power supply voltages ( 13 / 18V ) to select antenna polarization, and pilot tones ( 22 kHz ) to instruct the LNB to select one of the two frequency bands.

The antenna is constantly pointing at the satellite it uses to transmit and receive signals.

A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves.

These photosystems are light-driven redox centers, each consisting of an antenna complex that uses chlorophylls and accessory photosynthetic pigments such as carotenoids and phycobiliproteins to harvest light at a variety of wavelengths.

Slinky has seen uses other than as a toy in the playroom: it has appeared in the classroom as a teaching tool, in wartime as a radio antenna, and in physics experiments with NASA.

The device described in World War II patent works as follows: The shell contains a micro-transmitter which uses the shell body as an antenna and emits a continuous wave of roughly 180 – 220 MHz.

Icom, a mobile telecommunications equipment manufacturer, uses TNC antenna output terminals in some models intended for the professional VHF PMR market.

MRI uses three electromagnetic fields: a very strong ( on the order of units of teslas ) static magnetic field to polarize the hydrogen nuclei, called the static field ; a weaker time-varying ( on the order of 1 kHz ) field ( s ) for spatial encoding, called the gradient field ( s ); and a weak radio-frequency ( RF ) field for manipulation of the hydrogen nuclei to produce measurable signals, collected through an RF antenna.

Israel has developed the IAI / Elta EL / M-2075 Phalcon system, which uses an AESA ( Active Electronically Scanned Array ) in lieu of a rotodome antenna.

It is also possible to send digital data to the space station via laptop computers hooked up to the same radio and antenna, similar to an email communication, except that it uses radio frequencies instead of telephone or cable connections.

The FCC was susequently charged by Congress to conduct a study into the uses and capabilities of Amateur Radio Service communications in emergencies and disaster relief, and into the existence of impediments thereto, including the effects of unreasonable or unnecessary private land use restrictions on residential antenna installations.

The Coaxial Colinear or COCO antenna uses transposed coaxial sections to produce in-phase half-wavelength radiators.

The system requires an elliptical antenna of at least 45x60cm in size with a special LNB pair built as one unit to accommodate the narrow 3. 8 ° spacing between satellites ; the receiver uses the Motorola-proprietary Digicipher II system which has so far been virtually free of the problems with pirate decryption that have plagued other providers such as rival Bell TV.

A central antenna or antenna array broadcasts to several receiving antennas and the system uses a form of Time-division Multiplexing to allow for the back-channel traffic.

The waveguide directs the extracted RF energy to the load, which may be a cooking chamber in a microwave oven or a high-gain antenna in the case of radar.

The beam has to have a large diameter so that only a small portion of the beam misses the sail due to diffraction and the laser or microwave antenna has to have a good pointing stability so that the craft can tilt its sails fast enough to follow the center of the beam.

* A two-channel microwave radiometer of the crystal video type operating in the standard Dicke mode of chopping between the main antenna, pointed at the target, and a reference horn pointed at cold space.

The microwave radiometer, the infrared radiometer and the radiometer reference horns were rigidly mounted to a 48 cm diameter parabolic radiometer antenna mounted near the bottom of the mast.

A microwave radiometer and an infrared radiometer and the radiometer reference horns were rigidly mounted to a 48 cm diameter parabolic radiometer antenna mounted near the bottom of the mast.

In telecommunication, aperture-to-medium coupling loss is the difference between the theoretical antenna gain of a very large antenna, such as the antennas in beyond-the-horizon microwave links, and the gain that can be realized in practice.

Radar corner reflectors are designed to reflect the microwave radio waves emitted by radar sets back toward the radar antenna.

There are a number of devices that can achieve this objective, ranging from a large low-inductance capacitor bank discharged into a single-loop antenna or a microwave generator to an explosively pumped flux compression generator.

To achieve the frequency characteristics of the pulse needed for optimal coupling into the target, wave-shaping circuits and / or microwave generators are added between the pulse source and the antenna.

In point-to-point microwave antennas, a " high performance " antenna usually has a higher front to back ratio than other antennas.

Other factors affecting the front to back ratio of a parabolic microwave antenna include the material of the dish and the precision with which the reflector itself was formed.

Since the 1980s, versions for use at microwave frequencies have been made with patch antenna elements mounted in front of a metal surface.

In microwave electrosurgery an antenna that is placed directly into tissue may not always have an optimal match with the feedline resulting in an SWR.

The general principle underlying all the devices is that a microwave antenna that resides in a urethral catheter is placed in the intraprostatic area of the urethra.

By October 2011, the radar antenna arrays had been dismantled and removed from the deactivated station, but microwave towers and various buildings remained.

At such extreme long range the antenna would be unable to provide any propulsion, but Starwisp would be able to use its wire sail to collect and convert some of the microwave energy into electricity to operate its sensors and transmit the data it collects back home.

Especially at microwave frequencies, a receiving antenna may include not only the actual electrical antenna but an integrated preamplifier or mixer.

Since the size of a directional antenna depends on it being large compared to the wavelength, very directional antennas of this sort are mainly feasible at UHF and microwave frequencies.

A microwave antenna may also be fed directly from a waveguide in lieu of a ( conductive ) transmission line.

* Algorithm and spreadsheet for making a simple paraboloid: Design and make a paraboloid for use as a solar concentrator, sound mirror or microwave antenna.

Reception of BRS-delivered television and data signals is done with a rooftop microwave antenna.