90 Glossary
L
LED Light Emitting Diode, a device that is able to
emit light.
M
mute A mute controls the circumstances under
which a received signal is passed to the radio’s
speaker. For example, when a signal is
received by the radio, the mute may remain
‘closed’ if the signal is not strong enough, or
does not have valid signaling.
P
P25 Project 25. The Association of Public Safety
Communications Officials (APCO) established
Project 25 (P25). This project was led by
United States Federal, state, and local
government representatives to develop
standards for interoperable digital radios and
systems to meet the needs of public safety
users. See http://www.project25.org for
further information.
R
repeater A repeater is a relaying site, usually situated
above a city or town. The repeater extends
the range of radio communications by
receiving and re-transmitting signals received
from radios.
RF Radio Frequency, the part of the
electromagnetic spectrum that is suitable for
radio transmissions. The frequency of the RF
signal is described in terms of the number of
cycles per second or Hertz (Hz).
RSSI Received Signal Strength Indicator, a symbol
or number that shows the strength of a
received signal.
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