例句與造句

1. Most early spark transmitters were powered by batteries or Leyden jars.
2. Working with Ray Newby, he initially used high-frequency spark transmitters.
3. In the early years of the 20th century, before modern spark transmitters.
4. Manufacturers produced spark transmitters which generated long " ringing " waves with minimal damping.
5. Radio communication at this time employed spark transmitters, which were limited to sending messages in Morse code.
6. It's difficult to find spark transmitters in a sentence. 用spark transmitters造句挺難的
7. It was during this period that Fisher developed an interest in amateur radio, constructing rudimentary spark transmitters and receivers.
8. This station used a spark transmitter and could only transmit Morse code, so it was never used for entertainment broadcasts.
9. Beginning around 1905 continuous wave ( CW ) transmitters began to replace spark transmitters for radiotelegraphy because they had much greater range.
10. Another problem with the spark transmitter was a result of the shape of the waveform produced by each burst of electromagnetic radiation.
11. Reginald Fessenden's first attempts to transmit voice employed a spark transmitter operating at approximately 10, 000 sparks / second.
12. Professor Clarence Freeman of the Armour Institute became interested in de Forest's work and developed a new type of spark transmitter.
13. Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup.
14. Damped wave spark transmitters were replaced by continuous wave vacuum tube transmitters around 1920, and damped wave transmissions were finally outlawed in 1934.
15. Use of the spark-gap transmitter led to many radio operators being nicknamed " Sparks " long after they ceased using spark transmitters.
16. Most high power gas-discharge street lamps ( mercury and sodium vapor ) still use modified spark transmitters as switch-on ignitors.
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