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FREQUENCY MODULATION
radio modulation techique where information (usally voice or music) is added to the signal and changed by varying the freqeuncy of the transmitter. FM is the most commonly used modulation for radio signals techneque above 30 MHz.
the term "FM" is also used to refer to the broadcast band from 88.1 to 107.9 MHz, using that same modulation mode.
FM signals have less static because changes in frequency do not pick up interferance that AM-modulated signals do.
radio term
ha ha (laughter)
"hi hi" is the Morse equivalent of a laugh as in Morse it sounds like someone chuckling ("hehhehhehheh hehheh"). That is ditditditdit dit dit --- or dot dot dot dot dot dot. You really have to listen to it sent in Morse to appreciate its laugh like sound. It is most commonly used in CW (Morse Code), but has carried over to voice as well. Many CW expressions have carried over to voice -- such as 73 (Best Regards) and 88 (love and Kisses), etc. The origin probably dates back before radio to the telegraph days. And since Hams used Morse long before voice became practical-- the sound of the Morse characters HI HI was used to resemble a laugh sound. In some sense it is equivalent of a smiley. It's onomatopoeic -- that is the naming of a thing or action by a vocal imitation of the sound associated with it (as buzz, hiss) The definitive answer might be found in the "Dodge's The Telegraph Instructor Manual" circa 1850 to 1900. However, I have never been able to find a copy of this document. Wish I could as it would help to see the transitions from telegraph to radio usage.
California Highway Patrol
the largest highway patrol organization in the world. with a VHF radio network that kicks LAPDs ass.
The CHP practicly owns the 42 MHz band, i can hear them in Virginia with high-skip days.
High Frequency
radio communication services from 1.8 to 29.7 MHz, used for long-range communications, the only band used for worldwide communcations other then mircowave and UHF satellite services
"Johnson, get Washingtion on the HF"
a periodic oscillation, as simple harmonic motion, having the same geometric representation as a sine function.
example is too short, so very true.
The Cessna 172 (and its close relatives, the C-150, C-152, C-170, C-175, C-180 and C-182) is a small single-engine aircraft that is popular with drug dealers, survivalists and (sigh) the Civil Air Patrol.
please, someone think of a better definition!
usally this:
a device (usally a heavly modified FRS base station radio) that has been set up to jam frequencies in the FRS radio band, used to annoy little kids and to hold a channel for yourself. Some FRS jammers even add music to thier transmissions, which makes it all the more interesting.
"I can't hear anything on channel, that radio op's got his FRS jammer on again"