78
Beyond the Basics
glossary
Channels
– programmable memory locations for frequencies you
want to monitor. Each time the scanner fi nds an active frequency,
it stops and monitors radio traffi c on that channel until the
transmission ends. It then resumes scanning.
Channel-Storage Bank
– storage area for a group of channels.
Channels are storage locations for frequencies. You can scan the
channel-storage banks to see if there is activity on frequencies
stored there. Whereas a channel can only contain one frequency,
a channel storage bank can hold up to 50 channels. To make it
easier to identify and select the channels you want to listen to,
your scanner divides the channels into 10 banks (0 to 9) of 50
(00 to 49) channels each, for a total of 500 channels. You can use
each channel-storage bank to group frequencies, such as those
used by different public safety agencies and jurisdictions in your
area. Channel storage banks can easily be enabled or disabled
while scanning by pressing the number key that corresponds to
the desired channel storage bank.
Digital Operation
– Your scanner is equipped with advanced
Digital Signal Processing circuitry to receive and decode Phase 1
APCO-25 C4FM (four level FM) digital voice transmissions. This
section of the manual will help you understand the differences
between traditional analog and digital modulation. For ease of
use, your scanner is designed to automatically detect digital
modulation on any conventional channel programmed for
FM/Digital (FM) modulation. It is not necessary to confi gure
individual channels for digital operation. Many digital trunked
radio systems are actually mixed mode systems that support
both analog and digital modulation. Certain user groups on these
systems may use analog modulation, while others use digital
modulation. Your scanner will automatically detect the type of
modulation being used and switch to the correct modulation
mode without special programming or user intervention. Your
scanner also features Intelligent Adaptive Digital Tracking for
optimal reception of digital signals from a variety of digital
conventional and trunked radio system types. No special sound
quality settings or adjustments are needed for different C4FM
sytem types. Digital modulation represents a breakthrough in
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