The sideband lower in frequency than the transmitters carrier. A reception approach where the carrier produced by a receivers BFO circuit or product detector is used to substitute the carrier of an AM sign for higher reception. DXpedition: An organized effort by ham radio operators to put a rare location on the air, or a trip by shortwave listeners to a site for favorable DX reception. A receiver circuit consisting of a beat frequency oscillator and extra circuitry for enhanced reception of SSB alerts. Yagi: A directional antenna consisting of a dipole connected to the receiver or transmitter and two further components, a slightly longer reflector and a slightly shorter director. A directional antenna consisting of two one-wavelength "squares" of wire placed a quarter-wavelength apart. In FSK, the higher of the 2 frequencies used. A filter that rejects all frequencies above a certain level however which allows all lower frequencies to pass.

A filter that rejects all frequencies below a certain point but which permits all increased frequencies to move. An antenna suitable for operation on only one band of frequencies. Radio alerts from 300 to 3000 kHz, though this term is usually used to imply any radio sign in the AM broadcast band (540 to 1700 kHz). Radio indicators 300 kHz and decrease in frequency, although this term is usually used to mean any radio signal decrease than 540 kHz. GMT: Abbreviation for Greenwich mean time. SWR: Abbreviation for standing wave ratio. The ratio between two power levels on a logarithmic scale. A high pitched "whistle" sound attributable to two carriers interfering with each other. The pitch of the "whistle" depends upon the frequency difference between the carriers. A device that receives multiple indicators inside a certain frequency vary and concurrently retransmits them in another frequency vary. A frequency that is an integer a number of (two instances, 3 times, etc.) of a lower frequency. LUF: Abbreviation for lowest usable frequency, the bottom frequency that can assist propagation between two factors. MW: Abbreviation for megawatt. IRC: Abbreviation for International Reply Coupon. FSK: Abbreviation for frequency shift keying.

UHF low: The frequency range from 450 to 470 MHz. A tuning method in transmitters and receivers which makes use of a couple of piezoelectric crystals to generate a variety of frequencies. A time period used to explain receivers and transmitters covering at least the frequency range of 500 kHz to 30 MHz and capable of operation in several completely different modes, including AM, CW, and SSB. DXCC: Abbreviation for "DX Century Club," an award given by the ARRL to hams who contact other hams in no less than 100 completely different nations. FEC: Abbreviation for forward error correction, a FSK mode that transmits each character twice to avoid errors. A mode that shifts the stations service between two fixed frequencies to type characters. An antenna appropriate for operation on a number of totally different bands of frequencies. For greatest efficiency, the impedance of an antenna, the feedline, and the antenna connector on a radio should be approximately equal. An antenna that radiates, or receives greatest, radio waves having their electric discipline parallel to the Earths surface. The opposition to the circulation of electric current and radio energy; it is measured in ohms (W).

RST: A code used by ham radio operators to indicate a stations readability, signal strength, and tone of its Morse code signals. Slang for a face-to-face assembly between two ham radio operators or radio hobbyists. Slang for the maximum transmitter power authorized for ham radio operators. The route of most radiation or obtained sign power for a directional antenna. S-meter: A meter or bargraph that signifies the relative energy of a acquired sign. The obvious increase within the power of a sign radiated or acquired by an antenna caused by the antenna having higher efficiency in some instructions than others. An antenna that transmits and receives equally effectively in all instructions. The frequency at which an antenna radiates or receives with most effectivity. MUF: Abbreviation for optimum usable frequency, the very best frequency that may support propagation between two factors. Hz: Abbreviation for kilohertz. Unit equal to 1,000,000 hertz or a thousand kilohertz. Unit equal to a thousand hertz. Unit equal to 1,000,000 watts of transmitter power.

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