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Repeater : A transceiver - often comprised of separate transmitted and receiver linked by controlling hardware. A repeater picks up a radio signal and re-transmits it, allowing weak stations to be heard from further away than normally possible.

Resistance : The measure of how much an object (a resistor) opposes the flow of electric current.

table of resistivities : The measure of how strongly a material (eg plastic) opposes the flow of electric current.

Resistor : A device that opposes the flow of electric current.

RFI : Radio Frequency Interference (also BCI - broadcast interference, TVI - television interference). Normally resolved by installation of filters at the transmitter, the affected receiver(s) or both.

RSGB : Radio Society of Great Britain - national amateur radio organisation of UK.

RSQ code Used to describe the readability, strength and quality of digital modes.

RST code Used to describe the readability, strength and tone of voice or CW transmissions.

RSV code used to describe the readability, stength and video quality of SSTV transmissions

RX : Abbreviation for receive or receiver