User's Manual

Chapter 2
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GENERAL DESCRIPTION
2.1. Hardware Platform
UHF module electronic hardware consists of Zero-IF RF Front-End and Digital Section based on
BlackFin DSP micro processor. Both are located on a single PCB board.
LMR400 radio modem utilizes ultra-wide dynamic range RF front-end developed specifically to
provide the adjacent channel power ratio and adjacent channel selectivity levels required by FCC
Part 90 standards.
Digital Section is responsible for:
• Baseband modulation/demodulation;
• MAC Protocol performance;
• Serial Data Interface Control Logic (RTS and CTS).
• System Initialization and configuration including initialization of configurable devices in
the RF frontend.
Both factory and user specific configuration parameters will be stored in the flash memory.
However, only user specific parameters can be changed on the field. The factory configuration
includes maximum allowed output power (500mW – unlicensed and 1 W – licensed), six-byte
unique serial number, and unit specific calibration tables.
2.2. Physical Interfaces
2.2.1. Serial Data/Command Interface
The serial asynchronous interface allows connection to external serial devices. It is shared
between user data and unit’s command/status information. All commonly supported baud rates,
parity and bit configurations are available up to 115.2 kbps for UART.