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Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]
The 800 MHz band (851-866 MHz) is heavily used in most of the US. Frequencies are reserved for Public Safety and for Industrial users. The 900 MHz band (935-940 MHz) is available solely for Industrial users. Finally, Public Safety entities are allotted an exclusive band of frequencies at 758-806 MHz.
The Federal Communications Commission assigns licenses to these entities in the public safety (PP and PX) allotments of the spectrum. These include allocations in the lower portion of the VHF spectrum (around 39–45 MHz), highly susceptible to "skip" interference but still used by state highway patrols; the VHF "hi-band", from 150–160 MHz ...
The report defined proposed methods for frequency reuse, coordination, and interference reduction. [2] The standards also gained acceptance in businesses such as Specialized Mobile Radio, utility communications systems, and refineries. [1] [2] The study concluded that those frequencies would be suitable for Public Safety mobile radio uses.
Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]
LMR Narrowbanding is the result of an FCC Order issued in December 2004 [3] mandating that all CFR 47 Part 90 business, educational, industrial, public safety, and state and local government [4] VHF (150-174 MHz) and UHF (421-470 MHz) Private Land Mobile Radio (PLMR) licensees operating legacy wideband (25 kHz bandwidth) voice or data/SCADA systems to migrate to narrowband (12.5 kHz bandwidth ...