Introduction - Motorola W4 User Manual

Introduction

The ASTRO Digital Spectra and Digital Spectra Plus radios are
among the most sophisticated two-way radios available. They can
operate in the following frequency ranges:
VHF
136-162 MHz
146-174 MHz
These channels provide maximum communications capability under
varying operating conditions.
One of the newest in a long line of quality Motorola products, the
ASTRO Digital Spectra and Digital Spectra Plus radios provide
improved voice quality across more of your coverage area. The digital
process called embedded signaling intermixes system signaling
information with digital voice, resulting in improved system reliability
and the capability of supporting a multitude of advanced features.
Such features add up to better, more cost-effective two-way radio
communications.
ASTRO digital technology is also helping to provide the solution to
improved spectral efficiency requiring only half as much bandwidth
per channel (12.5kHz) compared to analog technology (25/30 kHz).
The net benefit to you is fewer users per channel or more users per
system.
Note: All references in this manual to ASTRO Digital Spectra are
applicable to ASTRO Digital Spectra Plus, except when a
difference is clearly stated. These differences particularly
apply to the display at start-up.
ASTRO Digital Spectra and Digital Spectra Plus radios can include an
optional RS-232 data port to interface with external devices, such as
certain fax machines and laptop computers. ASTRO Digital Spectra
and Digital Spectra Plus voice radios and data terminals can access
the same channel without interfering with each other.
ASTRO Digital Spectra and Digital Spectra Plus Model W4, W5, W7, and W9
UHF
403-433 MHz
450-482 MHz
482-512 MHz
800 MHz
806-824 MHz
851-870 MHz
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