Glossary 73
Glossary
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
repea
ter
A repeater is a relaying site, usually situated above a city
or town, for example, on a hill, that receives and re-
transmits signals received from radios.
repea
ter
talkar
ound
In repeater talkaround mode radios transmit and receive
directly with other radios on a single frequency (known
as simplex operation) without the need for a repeater.
RF Radio Frequency is the signal (radio waves) that the
radio transmits and receives. The frequency of the signal
is described in terms of the number of cycles per second
or Hertz (Hz). RF is part of the electromagnetic
spectrum, as is sunlight.
RSSI RSSI (Received Signal Strength Indicator) is a level that
indicates the strength of the received signal.
V
valid
signal
A valid signal is a signal that the radio responds to by
unmuting the receiver. A signal is valid, for example,
when it is stronger than a minimum level.
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