Glossary 131
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, an
icon or number that shows the strength
of a received signal.
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