spark gap transmitter造句

例句与造句

1. Spark gap transmitters generate fairly broad-band signals.
2. KGH used synchronous rotary spark gap transmitters.
3. Long after operators no longer used spark gap transmitters for communications, the military used them for radio jamming.
4. A spark gap transmitter with 75 kilowatts of power fed four tall antennas on the site overlooking the ocean.
5. Though ubiquitous in early radio, the spark gap transmitter was finally doomed by its extremely broad frequency spectrum and damped wave output.
6. It's difficult to find spark gap transmitter in a sentence. 用spark gap transmitter造句挺难的
7. Spark gap transmitters were the first devices to demonstrate practical radio transmission, and were the standard technology for the first three decades of radio ( 1887 1916 ).
8. The radio signal from a spark gap transmitter consisted of pulses of radio waves ( damped waves ) which repeated at an audio rate, around several hundred per second.
9. The output of a rotary spark gap transmitter was turned on and off by the operator using a special kind of telegraph key that switched power going to the high voltage power supply.
10. Hertz used a tuned spark gap transmitter and a tuned spark gap detector ( consisting of a loop of wire connected to a small spark gap ) located a few meters from the source.
11. In September 1927, KGH was purchased by Mackay Radio & Telegraph Company, a subsidiary of International Telephone & Telegraph Corporation . and replaced one of the spark gap transmitters with the new arc and tube type.
12. After radio waves were discovered in 1887, the first generation of radio transmitter, the spark gap transmitters, produced strings of " damped waves ", pulses of radio waves which died out to zero quickly.
13. In 1905 a " state of the art " spark gap transmitter generated a signal having a wavelength between 250 meters ( 1.2 MHz ) and 550 meters ( 545 kHz ) . 600 meters ( 500 kHz ) became the International distress frequency.
14. Early transmitters were spark gap transmitters : a mechanical device would make sparks at a fixed but audible rate; the sparks would put energy into a resonant circuit that would then ring at the desired transmission frequency ( which might be 100 kHz ); this ringing would quickly decay, so the output of the transmitter would be a succession of damped waves.
15. A Marconi station built in 1902 at South Wellfleet, Cape Cod, Massachusetts ( initial callsign " CC ", " MCC " 1908 to 1911, finally " WCC " from 1911, ) transmitted its first telegraphic message via spark gap transmitter in 1903 from what is now known as the National Park Service " Marconi Area, " about a mile north of the entrance to Marconi Beach.