1 GUARDIAN OVERVIEW
This document provides information required for the operation and verification of the CalAmp Guardian narrowband
modem.
1.1 GENERAL DESCRIPTION
This DSP-based radio is designed for SCADA, telemetry, and industrial applications in the 136-174 MHz, 215-240
MHz-VHF, 406.1-512 MHz UHF, and 928-960 MHz frequency ranges
.
Guardian supports serial Remote Terminal Units (RTU) and programmable logic controllers (PLC).
1.2 OPERATIONAL CHARACTERISTICS
The Guardian Narrowband Modem has the following operational characteristics.
• Frequency range of 136-174 MHz, 215-240 MHz, 406.1-470 MHz, 450-512 MHz, or 928-960 MHz.
• User-selectable data rates.
• Built-in transceiver adjustable from 1 to 10 watts (8 watts max for 900MHz).
• Wide input power range of 10 to 30 volts DC.
• Online and Offline Diagnostics.
• Supports up to 8 different link configurations which include frequency channel pairs
(selectable through user interface port). See the following section, 1.3 Link Configurations.
• Industrial operating temperature range of -30° C to +60° C.
• Rugged die-cast aluminum and steel case.
• UL Certified for Hazardous Locations when powered by a listed Class 2 source.
These features provide system benefits that give users
Rugged Packaging Guardian is housed in a compact and rugged cast aluminum case. Built for industrial applications in a
variety of environments, Guardian operates over an extended temperature range and provides worry-free operation in
the roughest environments.
Simple Installation Basic installation typically utilizes an omnidirectional antenna at the master station or Relay Point
and a directional antenna at each remote site not a Relay Point. See Sections 2.3, 2.4, and 2.5 for information about
Site and Antenna Selection. For basic service, just hook up an antenna, apply primary power, then check and set a few
operating parameters and you are done.
Flexible Management Configuration, commissioning, maintenance and troubleshooting can be done locally or
remotely. There are no physical switches or adjustments. The Full-Duplex Guardian allows for simultaneous reception
and transmission of data, and feature dual ports. All Full-Duplex models and the 900 MHz Dual-Port model provide a
receive antenna connector allowing for unique customer applications requiring additional receive filtering, external
PA(s), and other options.
Long Range Narrowband configurations allow better coverage over harsh terrain.
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 1
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