spark transmitter वाक्य
उदाहरण वाक्य
मोबाइल
- Most early spark transmitters were powered by batteries or Leyden jars.
- Working with Ray Newby, he initially used high-frequency spark transmitters.
- In the early years of the 20th century, before modern spark transmitters.
- Manufacturers produced spark transmitters which generated long " ringing " waves with minimal damping.
- Radio communication at this time employed spark transmitters, which were limited to sending messages in Morse code.
- It was during this period that Fisher developed an interest in amateur radio, constructing rudimentary spark transmitters and receivers.
- This station used a spark transmitter and could only transmit Morse code, so it was never used for entertainment broadcasts.
- Beginning around 1905 continuous wave ( CW ) transmitters began to replace spark transmitters for radiotelegraphy because they had much greater range.
- Another problem with the spark transmitter was a result of the shape of the waveform produced by each burst of electromagnetic radiation.
- Reginald Fessenden's first attempts to transmit voice employed a spark transmitter operating at approximately 10, 000 sparks / second.
- Professor Clarence Freeman of the Armour Institute became interested in de Forest's work and developed a new type of spark transmitter.
- Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup.
- Damped wave spark transmitters were replaced by continuous wave vacuum tube transmitters around 1920, and damped wave transmissions were finally outlawed in 1934.
- Use of the spark-gap transmitter led to many radio operators being nicknamed " Sparks " long after they ceased using spark transmitters.
- Most high power gas-discharge street lamps ( mercury and sodium vapor ) still use modified spark transmitters as switch-on ignitors.
- Beginning in 1905, demonstration radiotelegraph stations, using spark transmitters and electrolytic detectors, were installed for evaluation by the U . S . Navy.
- While the various early systems of spark transmitters worked well enough to prove the concept of wireless telegraphy, the primitive spark gap assemblies used had some severe shortcomings.
- Most operators, however, still preferred spark transmitters because of their uncomplicated design and because the modulate the carrier and to prevent transmitter leakage from de-sensitizing the receiver.
- As late as 1955, a Japanese radio-controlled toy bus used a spark transmitter and coherer receiver; the spark was visible behind a sheet of blue transparent plastic.
- Some early CW transmitters employed an arc converter that could not be conveniently Spark transmitters used for this method consumed a lot of bandwidth and caused interference, so it was discouraged by 1921.
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