Codan Radio P25 Training Guide - Manual (Page 16)

TRAINING GUIDE | P25 RADIO SYSTEMS
Chapter 1: Introduction To P25 Page 8
Figure 1-4: C4FM Demodulator
The C4FM demodulator receives a signal from the P25 C4FM modulator or analog FM modulator. The
frequency modulation detector in the fi rst stage of the demodulator allows a single, Phase 1 demodulator
to receive C4FM or analog FM. The benefi t of this is that when migrating to a P25 Phase 1 system, the
receiver is capable of detecting and receiving both analog and P25 digital signals.
BENEFITS OF P25
P25 has many various benefi ts in performance, effi ciency, capabilities and quality. Key P25 technology
benefi ts include:
Interoperability
Radio equipment that is compatible with P25 standards will allow users from different agencies or
areas to communicate directly with each other. This will allow agencies on the federal state/provincial
or local level (or any other agency) to communicate more effectively with each other when required
(emergencies, law enforcement, etc.)
The APCO Project 25 Interface Committee (APIC) has formed the Compliance Assessment Process
and Procedures Task Group (CAPPTG) to ensure that P25 equipment and systems comply with P25
standards for interoperability, conformance, and performance regardless of the manufacturer and in
accordance with the User Needs Statement of Requirements.
Receiver
Front
End
Digital IF DSP C4FM
TIME
CONSTANT ENVELOPE
SPECTRUM
12.5 kHz
Channel
C4FM DEMODULATOR