AM (Amplitude Modulation) - A type of modulation used by CB radios in which the amplitude of the carrier wave is varied.
Antenna - Device that transmits and receives radio waves.
Channel (channel) - Specific frequency within a band on which communication can take place
CTCSS (Continuous Tone-Coded Squelch System) - System that uses subtle tones to block out unwanted communications.
DCS (Digital-Coded Squelch) - A digital version of CTCSS, which uses digital codes to filter out unwanted communications.
Duplex - Communication using two frequencies, one for transmitting and one for receiving, often used in repeater systems
Frequency - A frequency e.g. 118.230 MHz on which communication takes place.
Frequency band - A specific range (band) of frequencies. For example, 108 to 400 MHz is the Airband, all aviation communications are on this, so you have a frequency band for each sector.
Gain - Amplification of a signal, often expressed in decibels (dB).
Impedance - Resistance of a circuit to alternating current, often expressed in ohms (Ω).
Modulation - Process of modulating a signal to convey information. Common types are AM (Amplitude Modulation) and FM (Frequency Modulation).
PL (Private Line) - Motorola's brand name for CTCSS.
Propagation - How radio waves travel through the atmosphere.
Repeater - A device that retransmits a received signal on a different frequency, thereby increasing the range of communication.
RF (Radio Frequency) - The frequencies of electromagnetic waves used for radio communications.
Scan - A function that allows you to scan for frequencies on which communications can be heard.
Simplex - Communication using the same frequency for both transmission and reception.
Skip - Phenomenon in which radio waves are reflected by the ionosphere and therefore travel over great distances.
SSB (Single Side Band) - A variant of AM modulation that is more efficient in bandwidth and power
Squelch - Setting that reduces background noise by turning off the audio when no signal is received.
SWR (Standing Wave Ratio) - Ratio that indicates how well an antenna is tuned to the transmitter frequency.
UHF (Ultra High Frequency) - Frequency band from 300 MHz to 3 GHz, used for television broadcasting, mobile phones, and two-way radios.
VHF (Very High Frequency) - Frequency band from 30 MHz to 300 MHz, often used for FM radio, television transmitters, and maritime communications.
Wavelength - The distance between two peaks of a wave, often measured in meters
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