Repeater Terminology Explained.pdf

- Autopatch/Patch: Enables repeater users to make calls on the telephone system.
- Break: Emergency signal to interrupt conversations.
- Carrier-Operated Relay (COR): Triggers repeater transmission in response to a received signal.
- Channel: Pair of frequencies (input and output) for repeater operation.
- Closed Repeater (CTCSS): Limited access, using subaudible tones (CTCSS).
- Digipeater: Packet radio (digital) repeater.
- DTMF: Dual-tone multifrequency, used for dialing on ham radios and regular phones.
- Duplex/Full Duplex: Simultaneous transmission and reception; half duplex uses separate times.
- Duplexer: Allows transmitter and receiver to share antenna.
- Frequency Coordinator: Assigns frequencies to new repeaters without causing interference.
- Hang Time: Courtesy period after transmission for others to access the repeater.
- Input Frequency: Receiver frequency, transceiver's transmit frequency.
- Intermodulation Distortion (IMD): Unwanted signal mixing causing unintended transmissions.
- Key Up: Activates repeater by transmitting on input frequency.
- Magnetic Mount: Antennas with magnetic bases for easy installation and removal from metal surfaces.
- NiCd Batteries: Rechargeable nickel-cadmium batteries used in portable transceivers.
- Open Repeater: Unrestricted access to the repeater.
- Output Frequency: Transmitter frequency, transceiver's receive frequency.
- Over: Signal indicating end of a voice transmission.
- Repeater Directory: Annual ARRL publication listing US, Canada, and other regions' repeaters.
- Separation/Split: Difference (in kHz) between transmitter and receiver frequencies; "oddball splits" use unusual separations.
- Simplex: Communication mode using same frequency for both transmit and receive.
- Time-Out: Turns off repeater or function after prolonged transmission.
- Timer: Measures transmission length to control time-out.
- Tone Pad: Keypad generating DTMF signals, similar to a telephone keypad (used in autopatches).