paltry
发表于 2025-3-23 10:56:06
https://doi.org/10.1007/3-540-33487-4 were essentially of a subjective nature. Objective measure?ments were exceptional cases. A frequency meter of the variety used in radio transmission systems was relied upon to adjust the oscillators as accurately as possible and to tune the resonant traps. The carrier output of the transmitter was
STALL
发表于 2025-3-23 16:23:00
https://doi.org/10.1007/3-540-33487-4Supply of electrical energy to large areas through overhead transmission lines has been expanded to a point where an extensive communication network has become an indispensable aid in system management. The communication media are used for
Libido
发表于 2025-3-23 20:49:03
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heterogeneous
发表于 2025-3-24 01:37:37
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呼吸
发表于 2025-3-24 05:57:30
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Generalize
发表于 2025-3-24 07:20:56
Characteristics of Power Line Carrier Channels,The limits of the repeatedly mentioned frequency range from 15 kc to 500 kc, which is made available for carrier communication over power lines, are determined by physical and economical conditions, partly also by administrative regulations.
languor
发表于 2025-3-24 11:54:51
Appendix,AC currents in open-wire lines are propagated at a speed equaling almost the velocity of light waves c = 300 000 km/sec. (186 000 miles/sec.) This applies both to the power current frequencies of 16 2/3 cps, 50 cps, and to the carrier frequencies of 15 kc to 500 kc as used in power line communication systems.
Hemodialysis
发表于 2025-3-24 18:04:26
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debris
发表于 2025-3-24 20:59:18
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Temporal-Lobe
发表于 2025-3-25 03:07:20
Measuring Methods and Measuring Equipment,proximate picture of signal attenuation in the carrier channel. Vacuum tube voltmeters were used to measure the HF voltages in the receivers and in by-pass circuits having no telephone stations connected to them.