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Chapter 1
15 www.arwestcom.com
P
RODUCT
F
EATURES
1.1. Introduction
AW400Tx 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.
AW400Tx is a half duplex, UHF Radio Transceiver. It takes incoming data, 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 to 470 MHz).
Figure 1-1. AW400Tx
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 ArWest Communications
receiver.
AW400Tx delivers a reliable radio link at up to 38.4 kbps over the air for the 25 kHz channel
spacing, 30 kpbs for 20 kHz, 19.2 kbps for 12.5 kHz, and 9.6 kbps for 6.25 kHz. The module
requires a regulated DC voltage power supply 4.2 V ± 5%.
The delivered product is a wireless system, which includes:
• AW400Tx – UHF Radio Transceiver;