4 ms·
HF radio. Highly depdendent on space weather, but generally I can communicate around the world with only 100 watts and a long wire. Be aware though that transm
by _moof 9mo ago
HF radio. Highly depdendent on space weather, but generally I can communicate around the world with only 100 watts and a long wire.
Be aware though that transmitting on any radio is like turning on a giant, extremely bright light bulb directly above your antenna. Anyone with basic radio know-how will be able to hear you and locate you.
- badc0ffee 9mo agoI had to think for a second to realize that HF means lower frequency than VHF, not high frequency in an absolute sense.
- _moof 9mo agoIt's very silly that "high frequency" is among the lowest frequencies, and that we wound up with Very, Ultra, Super, Extremely, and Tremendously High Frequencies!
- badc0ffee 9mo agoReminds me of High Speed USB.
- c0balt 9mo agoLong live Fast Ethernet
- squigz 9mo agoI thought you had to be joking, but... https://en.wikipedia.org/wiki/Tremendously_high_frequency https://en.wikipedia.org/wiki/Tremendously_high_frequency And here I was thinking that GregTech's "Ludicrous Voltage" sounded out of place...
- CableNinja 9mo agoScientists and engineers have fantastic senses of humor when naming things. > The time derivative of acceleration is called jerk, and the time derivative of jerk is called jounce. One published paper whimsically named the fourth, fifth, and sixth derivatives of "snap", "crackle", and "pop" after the cartoon characters on boxes of Rice Krispies breakfast cereal.
- tdeck 9mo agoIt's because when the term was first used, newer electronics to generate those frequencies had only recently become available. The HF band is 3-30 MHz. Maritime navigation was operating on 500kHz (.5MHz) for most of the 20th century because that was what Marconi's alternators used at the beginning of the system. These machines produced the carrier frequency mechanically by rotating a disc with lots of tiny magnets on it at high speed. https://en.wikipedia.org/wiki/Alexanderson_alternator https://en.wikipedia.org/wiki/Alexanderson_alternator
- quietsegfault 9mo agoBack in ye olden days, HF was really high! What we'd consider today to be near useless due to limited bandwidth and insane antenna requirements were once the primary frequencies for communications.
- _moof 9mo agoI wondered if that was the case! 28 MHz must've seemed pretty high at the time. :)