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Understanding Scanning and the BCT15
Repeater Operation
Repeat er syste ms u se two frequencie s: one t ransmits from the radio to a ce ntra l
repeat er; the othe r tran smits fro m the repeater to o t her radios in the syst em. W ith
a re peate r-based system, t he repe ater is located on t op of a tall b uildin g o r on a
radio t ower that provides great v is ibility to t he area of operation. When a us er
transmi ts (on an input fr equency), the signal is pi cked up by the repeater and
retransmitted (on an output frequency). T he user’s r adios alw ays l isten for acti vity
on the output fr equency and transmit on the input frequency. Since the repeater is
l oca te d very hi gh , ther e is a ve ry large li ne o f si gh t.
Typical re peat er systems p ro vide cove ra ge out to abou t a 25 -mile radius f rom the
repeater location.
What is Trunk Tracking?
You r BCT15 is designe d t o tra ck the f ollowing type s o f trunking systems.
• Mo toro la Typ e I, Type II, Type IIi hybrid, SM ARTNET, and P RIVAC YPL US
analog trunking syst ems, which are extensive ly used in 800 MHz
commu nication systems.
• LTR tr unking syst ems
• EDACS S CAT trunking syst ems
• EDACS tru nking syste ms
Wh en tracking t hese typ es of systems, you might wa nt to reme mber that your
scanner can track more than one t run kin g syst em at a time and scan con vent io nal
and t ru nke d syst ems at t he same time .
Conventional scanning is a sim ple concept. You enter a frequency used by
so me one you want to m on itor i n to you r sca nner’ s memor y. Fo r exa m pl e, th e pol ic e
in your area might transmi t on 460.500 MHz, the fire departm ent on 154.445 MHz,
the highway department on 37.900 M Hz, etc. So when your scanner stops on a
fr eque nc y, y ou usu al l y kno w who it i s, and more i mpor tantl y, yo u can stop on a
channel and listen to an entire conversation. This type of scanning is easy and fun.
However, as the dem and for public communications has i ncreased, many public
radio users do not have enough frequencies to meet their needs, creating a
serious proble m. Trun king radio systems h elp solve t his pro blem.