PSK31

A digital transmission mode -- Phase Shift keying with 31.25 baud rate

PSK31 is one of the better HF operating digital modes.

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takes the awards

when something is so cool it is worthy of getting the 'awards' whatever that may be

that's definitly taking the awards today

TDMA

Time Division Multiple Access


A method of digital wireless communications transmission allowing a large number of users to access (in sequence) a single radio frequency channel without interference by allocating unique time slots to each user within each channel. Rather than encoding bits of data like CDMA, each frequency is broken into time slots through which bits of data flow. Data can only flow in their assigned time slots.

Cellular (mobile) Phones use CDMA, TDMA, analog, or GSM for radio (voice) transmission as well as wireless internet connections.

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battleship

A fun game that teaches little children to play nice, as well as naval warfare tactics.

B-8!

You sunk my battleship!

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Morse Code

A communications system consisting of letters coded into dots and dashes, and used in radiotelegraph systems. (usally HF systems), and its fun to jam freeband stations with this stuff.

I jammed a pirate radio station with "HELLO HELLO I HATE YOU" in morse code over and over again.

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oscilloscope

A test instrument that shows a picture of electrical waveforms by means of a cathode ray tube. An oscilloscope is calibrated so one can measure the instantaneous values and waveforms of electrical signals that are changing rapidly or varying as a function of voltage or time. Also known as a Scope.

I use my oscilloscope to measure the waveforms of my 27 MHz band jamming transmitter.

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squelch tail

A burst of noise (a.k.a. "static") heard after a FM radio transmission ends. The random static sound is actually the radio trying to decipher the ambient background noise into meaningful audio. Usually this noise is hidden from the listener with the squelch function on the radio. In typical squelch systems, the audio circuit is turned off if the radio isn't receiving a signal of a certain minimum signal strength. The squelch tail occurs when the transmission has just ended and the radio circuitry doesn't respond quite fast enough. This is remedied by systems like STE or Squelch Tail Elimination by Motorola which send a brief subaudible tone right before the end of the transmission so that the audio circuit turns off before the modulated signal ends. Creative use of CTCSS like turning off the tone generation circuit on a repeater before the repeater tail will work for radios using tone squelch on both transmit and receive.

My VX-150 has a very long squelch tail.

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