Most high power transmitter amplifiers are of valve construction because of the high power required. Since valves are designed to operate with much higher...

television transmitters. Until the invention of the transistor in 1947, most practical high-frequency electronic amplifiers were made using thermionic valves. The...

stems with integrated transmitters for tire pressure monitoring systems (TPMS) became available. A valve cap on a Schrader valve prevents the entry of...

valve or axial check valve Ball valve Butterfly valve Check valve Control valve Diaphragm valve Flow limiter Flow measurement Gate valve Globe valve Mass...

alternator, and arc transmitters. However, it was not until the development of vacuum-tube (also known as "valve") transmitters that widespread audio...

service where solid-state transmitters at nearly all power levels have measurably higher efficiency. FM broadcast transmitters with solid-state power amplifiers...

power solid state transmitters also require a complex combination of transformers and tuning networks, whereas a valve-based transmitter would use a single...

A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current...

banned by 1934, except for some legacy use on ships. The vacuum tube (valve) transmitters which came into use after 1920 transmitted code by pulses of unmodulated...

numerous other uses. A transmitter can be a separate piece of equipment, or an electronic circuit within another device. Most transmitters consist of an electronic...

spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the...

each stage. The terms "regulator" and "demand valve" (DV) are often used interchangeably, but a demand valve is the final stage pressure-reduction regulator...

The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose...

four essential parts: rotating laser transmitter, laser receiver, control unit, solenoid valves. The laser transmitter emits a narrow laser beam which rotates...

A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion. The motion can be rotary or linear...

pneumatic transmitters and automatic 3-term (PID) controllers. The ranges of pneumatic transmitters were defined by the need to control valves and actuators...

A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct...

designing much higher power transmitters using a superior design of valve. This led to the production of 300 kW transmitters, the most powerful in the world...

A tetrode is a vacuum tube (called valve in British English) having four active electrodes. The four electrodes in order from the centre are: a thermionic...

with an output power of 16 kilowatts delivered by an NEC FBN11K20E valve transmitter. Though almost 20 years old it is fed with all-digital input equipment...

used as a radio transmitter from 1903 until the 1920s when it was replaced by vacuum tube transmitters. One of the first transmitters that could generate...

antenna. The transmitter is capable of transmitting signals to submarines worldwide to depths of approx. 30 metres. In 2016 the transmitters were updated...

Triode "continuous wave" radio transmitters replaced the cumbersome inefficient "damped wave" spark-gap transmitters, allowing the transmission of sound...

klystrons are used as output tubes in UHF television transmitters, satellite communication, radar transmitters, and to generate the drive power for modern particle...

transmit controller outputs to the modulating field devices such as control valves. These loops have the advantages of simplicity and noise immunity, and have...

mechanical feedback of the downstream pressure to control the opening of a valve which controls gas flow from the upstream, high-pressure side, to the downstream...

The final element consists of a valve, actuator and solenoids. The scheme above presents three pressure transmitters (PT) connected to a logic solver...

1920 with the callsign 'GKT' and was equipped with a six-kilowatt valve transmitter and a receiver, guaranteeing a two-way range of 1,500 miles (2,400 km)...

completed. By this time, however, arc transmitters were becoming obsolete, and valve or vacuum tube transmitters were soon afterwards installed at this...

described above, and can be transmitters or receivers. A differential transmitter is connected between a synchro transmitter and a receiver, and its shaft's...