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Understanding Scanning
20
Simplex Operation
Repeater Operation
What is Trunk Tracking?
Simplex systems use a single frequency for both
transmit and receive. Most radios using this type of
operation are limited to line-of-sight operation. This
type of radio is frequently used at construction job
sites, and with inexpensive consumer radios such as
UHF/PRS radios. The range is typically 1-12 km,
depending upon the terrain and many other factors.
Repeater systems use two frequencies: one transmits
from the radio to a central repeater; the other
transmits from the repeater to other radios in the
system. With a repeater-based system, the repeater is
located on top of a tall building or on a radio tower that
provides great visibility to the area of operation. When
a user transmits (on an input frequency), the signal is
picked up by the repeater and retransmitted (on an
output frequency). The user’s radios always listen for
activity on the output frequency and transmit on the
input frequency. Since the repeater is located very
high, there is a very large line of sight.
Typical repeater systems provide coverage out to
about a 40-km radius from the repeater location.
Your UBCD396T is designed to track the following
types of trunking systems.
• Motorola Astro (APCO 25) trunking systems.
• Motorola Type I, Type II, Type IIi hybrid,
SMARTNET, and PRIVACYPLUS analog trunking
systems, which are extensively used in 800 MHz
communication systems.
• LTR trunking systems
• EDACS SCAT trunking systems
• EDACS trunking systems