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The hertz (or Hz) is a unit of frequency, where one hertz was equal to one cycle per second, used to describe ranges of sound and of the electromagnetic spectrum.

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Used in applications Edit

Decihertz (10−1 Hz, dHz)
Hertz
Kilohertz (103 Hz, kHz)
Megahertz (106 Hz, MHz)

When the USS Voyager used a microprobe as a subspace communications relay to contact a Romulan science vessel through a micro-wormhole, B'Elanna Torres noted that the phase amplitude of the visual link with the ship was within a few megahertz of transporter protocols. (VOY: "Eye of the Needle")

USS Enterprise-D shield data

Display showing the shield modulation of 257.4 megahertz

Gigahertz (109 Hz, GHz)
  • 1.85 gigahertz: Hand phasers set to a dispersal frequency of 1.85 gigahertz were able to penetrate the Voth cloaking technology. (VOY: "Distant Origin")
  • 4.84 gigahertz: Subspace warheads encounter by Voyager in 2377 had an activation frequency of 4.84 gigahertz. (VOY: "Human Error")
  • 12 gigahertz: In 2372, the Voyager crew established contact with their duplicates by sending them a brief message telling them to lock onto a frequency of 12 gigahertz. (VOY: "Deadlock")
Starfleet Com Net end screen

The subspace communications frequency at 384.20 GHz

Terahertz (1012 Hz, THz)

Three hundred twenty-seven systems that used terahertz feeds were known to the Federation in 2367, none of which were used by Starfleet. The forged Federation phaser rifles created by the Romulans, discovered on Krios Prime and used by Kriosian rebels, were charged with a forced pulse, well into the terahertz range. This range is similar with those found in Romulan disruptors, which create an inverted initial output spike, with corresponding discharge crystal and emission beam pattern. (TNG: "The Mind's Eye")

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