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When propagation is feasible between two stations on the same frequency. A receiving circuit that provides additional amplification to weak signals but at the price of extra background noise and potential distortion. A FM radio signal robust enough to completely quiet the receiver background noise. A brief bit of noise heard between the top of a radio transmission and the reactivation of the receivers squelch circuit. Spoken at the top of a transmission to indicate that you've made your final transmission and that you expect no response. Spoken at the top of a transmission to indicate to the other station that it is their flip to transmit. QST: Radiotelegraph abbreviation for a transmission directed to all ham radio operators, additionally it is the identify of the ARRLs monthly journal. OM: Abbreviation for "outdated man," an outdated radiotelegraph abbreviation for any radio operator (presumed to be male); now used to check with any male radio operator or announcer. Slang for the gathering of spare elements and miscellaneous gadgets saved by a radio operator or hobbyist.

The principle items of gear used at a radio station. Slang term for home-built, noncommercial radio gear. Term referring to tropospheric ducting. FM: A time period used to refer to phase modulation. PM: Abbreviation for part modulation. A modulation methodology by which the timing, amplitude, and/or spacing of pulses of a transmitters provider are varied in order to convey data. The process of altering the output carrier of a transmitter indirectly in an effort to convey information. A repeater station that can be utilized by anybody; a service on its enter frequency will robotically be retransmitted on its output frequency. A modulation technique that suppresses one sideband and the carrier and transmits solely the remaining sideband. Whether an antenna transmits or receives maximum radio vitality in the horizontal or vertical airplane. The frequency at which an antenna radiates or receives with most effectivity. A frequency that's an integer a number of (two times, three times, and so forth.) of a decrease frequency. QSO: Radiotelegraph abbreviation for a contact between two or more stations. XYL: Radiotelegraph code for "ex-young lady," used to check with the wife of a radio operator. RST: A code utilized by ham radio operators to indicate a stations readability, signal power, and tone of its Morse code indicators.

Slang for the maximum transmitter power authorized for ham radio operators. CW: Sending Morse code over an AM transmitter utilizing an audio tone. A modulation technique that spreads transmitter vitality across a comparatively wide frequency vary according to a modulating code. VHF high band: The frequency vary from 150 to 175 MHz. It's indicated by numerous decibels rejection at a frequency level away from the desired signal. A filter that uses a network of mechanical piezoelectric components to obtain high rejection of unwanted indicators. Electromagnetic coupling between the weather focuses maximum power (or reception) in the direction of the director. Yagi: A directional antenna consisting of a dipole connected to the receiver or transmitter and two further components, a barely longer reflector and a barely shorter director. A directional antenna consisting of two one-wavelength "squares" of wire placed a quarter-wavelength apart. An antenna that gives no acquire or loss; its efficient radiated power is equal to the transmitter power applied to it.

The ratio of energy despatched down a feedline from the transmitter to the facility reflected back by the feedline to the transmitter. Unit equal to 1,000,000 watts of transmitter energy. Just like FM, this modulation technique varies the service frequency of a transmitter in accordance with the energy and frequency of the modulating signal. The sideband increased in frequency than the transmitters carrier. A sign equal to the bandwidth of the modulating frequency found above and beneath the provider frequency in an AM signal. Much like exalted service reception, but the substitute carrier tuning and tracking is completed routinely by the receiver. A mode that shifts the stations provider between two fastened frequencies to kind characters. A frequency that two or extra stations can use to communicate with each other. The frequency on which a repeater station will retransmit signals its hears on its enter frequency. Propagation of indicators on frequencies above 25 MHz via ionized trails left by meteors burning up within the ionosphere. VHF: Abbreviation for very high frequencies. Frequencies within the high frequencies area of three to 30 MHz, but this term is often used to discuss with frequencies from 1.7 to 30 MHz.

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