User:Mu301/wireless

Spark-gap

Spark-gap transmission bandwidth
figure wavelength (frequency) full bandwidth type of tuning
A 500 metres (600 kHz) — 1,200 metres (250 kHz) ~350 kHz untuned
1 775 metres (387 kHz) — 1,025 metres (292 kHz) ~95 kHz very badly tuned
2 850 metres (350 kHz) — 975 metres (307 kHz) ~43 kHz properly tuned
3 875 metres (343 kHz) — 950 metres (320 kHz) ~23 kHz most modern type,
very sharply tuned
Emission bandwidth of spark-gap transmitters
  • "Characteristics of a commercial transmitter on shipboard showing broad range of waves sent out."
    "Characteristics of a commercial transmitter on shipboard showing broad range of waves sent out."
  • "Characteristic of improperly adjusted transmitter showing double waves."
    "Characteristic of improperly adjusted transmitter showing double waves."
  • "Characteristic of properly adjusted transmitter showing single wave."
    "Characteristic of properly adjusted transmitter showing single wave."
  • "Characteristic of transmitter of most modern type showing very sharply defined wave." (Quenched-spark transmitter)
    "Characteristic of transmitter of most modern type showing very sharply defined wave." (Quenched-spark transmitter)
  • Kolster, Frederick A. (1912). "Statement of Mr. F.A. Kolster". Hearings Before the Committee on the Merchant Marine and Fisheries, House of Representatives on H.R. 15357, to Regulate Radio Communication. By Committee on the Merchant Marine and Fisheries. Radio Communication. Washington: Government Printing Office. pp. 64–70. Retrieved 25 January 2025.

Bands

Wireless band limits
wavelength (frequency) allocation
— 200 metres (1,500 kHz) amateur limit
300 metres (1,000 kHz) — 600 metres (500 kHz) commercial
600 metres (500 kHz) — 1,600 metres (190 kHz) government
1,600 metres (190 kHz) — commercial (long distance)
Wireless bands before and after the Radio Act of 1912
  • Overlapping usage, and interference, between amateur, government, and commercial wireless operators before the US Radio Act of 1912.
    Overlapping usage, and interference, between amateur, government, and commercial wireless operators before the US Radio Act of 1912.
  • Amateur, government, standard commercial, and high-power commercial (for long distance) bands defined by the US Radio Act of 1912.
    Amateur, government, standard commercial, and high-power commercial (for long distance) bands defined by the US Radio Act of 1912.

Massie

Fall River Line
Steamship Call
Priscilla CA
Pilgrim GM
Chester W. Chapin HN
Providence PV
Plymouth PX
City of Lowell WE

400 meters, 1 kW

GWEN

Tests

  • 2,182 kilohertz (137.4 m) = 137.4 metres (2,182 kHz)
  • 150 millimetres (5.9 in) 6 inches (150 mm)
  • 150 mm = 5.9055 in

Symbols

  • = equal
  • ≈ approximately
  • ≠ not equal
  • ≡ identity
  • ≃ asymptotic equality


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