User's Manual

20-496 Owner’s Manual Draft Page 58/78
you want to use the bank to store different data (such as a new set of talkgroup IDs).
1. Press PROG.
2. Press TRUNK to enter a talk group ID memory mode.
3. Select a talkgroup ID bank using FUNC, ^ or v.
4. Press FUNC and then 6. Confirm list clear? 1=YES Press other key for NO. appears in the scanner’s
display.
5. Press 1 to clear all talkgroup IDs within a bank. List cleared appears in the scanner’s display.
To cancel the delete operation, press any key except 1. The scanner returns to the talkgroup ID memory
mode.
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 configure 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 system types.
Digital modulation represents a breakthrough in public safety communications technology. Digital
modulation typically provides a clear, distortion free audio signal throughout the service area of the system
you are monitoring. However, there are some important differences between analog and digital voice
performance that you should be aware of while scanning.
In most cases, digital voice transmissions will be surprisingly crisp and clear, and without noise or distortion,
even when corresponding analog signals from the same system contain some static. However, if you are in