User's Manual
Table Of Contents
Chapter 1
13www.javad.com
PRODUCT FEATURES
1.1. Introduction
LMR400 DSP based integrated UHF Modem is the single board OEM wireless transceiver
intended for SCADA, outdoor telemetry applications and transmission / receiving of differential
corrections and additional information by terrestrial radio channels between two GNSS receivers.
LMR400 is a half duplex, UHF Radio Transceiver developed to be integrated in a new JAVAD
GNSS Receiver (TRIUMPH). It takes incoming data from a JAVAD GNSS receiver through the
standard asynchronous serial port (CMOS/ TTL compatible), modulates it with GMSK, FSK,
PSK or most spectrum efficient QAM modulation and transmits it at RF power output levels from
15 dBm up to 30 dBm operating in UHF frequency band (406.1 to 470 MHz).
Figure 1-1. LMR400
The UHF transceiver is also capable of receiving RF signals through a 50 Ohm impedance
external antenna port. These signals are demodulated and output to the JAVAD GNSS receiver.
LMR400 delivers a reliable radio link at up to 38.4 kbps over the air for the 25 kHz channel
spacing, 19.2 kbps for 12.5 kHz, and 9.6 kbps for 6.25 kHz.