Operations and Maintenance Manual

70-STR1800-00 Rev K STR-1800 O&M Manual
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SECTION 1 INTRODUCTION
The STR-1800 series of UHF radio represents a state-of-the-art communications product line providing
multi-mode, half-duplex audio to radio frequency (RF) transmit and receive functions. Consisting of
multiple models, the series provides analog FM transceiver functions in the 400 to 470 MHz frequency
band (STR-1820, STR-1820A, STR-1821, STR-1821A, and STR-1830) or the 136 to 174 MHz band (STR-
1840). The design has been tailored towards narrowband data telemetry applications requiring fast
transmit/receive response times with compact size and high reliability.
1.1 Scope
This manual describes the Summation Research, Incorporated STR-1800 series of Land Mobile Radios.
The manual includes specifications, design description, installation, and operation instructions along with
routine maintenance requirements for the STR-1800.
1.2 Product Description
The STR-1800 is a series of UHF and VHF digital and FSK analog radios. Versions of this product may
also support extended UHF and other frequency bands. In order to make the product more applicable for
data communications functions, the STR-1800 product line incorporates a custom front panel as depicted in
the following picture.
Figure 1 STR-1800 Multi-Mode Land Mobile Data Radio
The custom front panel replaces the normal operator oriented local status/control interface and audio
interface connector with a DB-25 connector targeted for computer control. The DB-25 provides both the
audio interface and a selection capability for frequency select. A secondary connector provides for
diagnostic and programming functions. These features are incorporated via a custom printed circuit board
(PCB) located within the STR-1800 front panel known as a Front Panel Card (FPC). This card in-turn
interfaces with an internal daughter card known as the Modem Card (MDC).
Figure 2 depicts a top level overview of the STR-1800 Radio.