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The person responsible for all capabilities and correct operation of a radio station. The person at a broadcasting station responsible for proper and authorized operation of a station and maintenance of all required information. A station that at all times operates from a constant, specified land location. The physical location from which a radio stations features (setting frequency, turning the station off and on, etc.) are controlled. When two or more packet radio stations concurrently attempt to transmit on the identical frequency. The amount of frequency area occupied by a radio signal. A receiver circuit that adjust the quantity of amplification given to a acquired sign so that the quantity from the speaker stays relatively constant. The constant output of a radio transmitter that can be periodically interrupted to send messages by Morse code. AMTOR: Acronym for "newbie teleprinting over radio," a mode that uses FSK to send messages containing error detection capabilities and the power request retransmission of lacking or corrupted data.

ANARC: Acronym for "Association of North American Radio Clubs," an affiliation of radio listener clubs within the United States and Canada. ARRL: Acronym for "American Radio Relay League," the nationwide association for ham radio operators in the United States. ASCII: Acronym for "American commonplace code for data interchange," a technique of representing higher and lower letters in addition to numbers and particular symbols. How well a receiver responds to weak indicators, measured in microvolts (mV); the lower the number of microvolts indicated, the extra delicate the receiver. Just like exalted service reception, however the substitute service tuning and monitoring is completed mechanically by the receiver. A tuning technique in transmitters and receivers which makes use of a number of piezoelectric crystals to generate a variety of frequencies. A frequency range set aside for international ham radio stations to transmit in while ham stations in the United States and Canada do not; American and Canadian stations name overseas stations on frequencies outside the window. A method of limiting entry to a repeater station to stations that start their transmission with a special sequence of tones. Spoken at the end of a transmission to indicate to the opposite station that it is their turn to transmit.

The frequency on which a radio transmission takes place, or the enter and output frequency pair used by a repeater station. The lower the angle, the higher distance the radio signal will travel by ionospheric refraction. Placing a loading coil at the middle of an antenna with the intention to lower the antennas resonant frequency. A modulation methodology during which the timing, amplitude, medium voltage overhead cable and/or spacing of pulses of a transmitters carrier are diverse to be able to convey data. PM: Abbreviation for part modulation. PLL: abbreviation for part locked loop. CW: Abbreviation for continuous wave. The frequency at or close to the MUF at which the utmost sky wave propagation range is obtained. A circuit that tunes a receivers signal amplifying circuitry for optimum sensitivity on a desired frequency vary. A machine installed between a receiver or transmitter and the antenna to match the radio impedance to the antenna impedance for maximum energy switch.

A circuit that eliminates undesirable audio frequencies from the audio output of a receiver. A modulation approach that varies the power output of a transmitter in accordance with the variations within the modulating audio sign. A modulation approach that varies the provider frequency of a transmitter in accordance with the variations within the strength of the modulating audio sign. This is used after a frequency to point that it varies barely. A group of stations that meet on a specified frequency at a certain time. A non-governmental group that works to voluntarily assign frequencies to users in order to forestall interference, particularly for repeater stations. A group of letters and numbers used to identify a station and the nation authorizing its operation. 1) When a station ends its operations and shuts down; 2) When a frequency can now not assist propagation to a desired station or location. QTH: Radiotelegraph abbreviation for a stations location.