User's Manual

MRX920 Overview
MRX920/MTX950 User’s Manual 2-15
Power Supply
The MRX920 unit is powered by a 12V DC power supply. Refer to
Table A.5 located on page A-3 for the different operating voltages
and current levels.
When components require more than 12 volts, additional voltage
is generated using DC/DC converters; when components require
less than 12 volts, linear regulators are used.
The power supply system has fuses and switches to control,
protect, and limit its operation.
Antenna
The MRX920 antenna, used for filter and reception, is connected
to the RF receiver subsystem.
The antenna is made of a corrosion-free material that is tolerant to
ultra-violet exposure. It has a magnetic base and is capable of
staying in place at speeds of up to 70 miles per hour (m.p.h.).
To prevent excessive use of the battery, the MRX920 unit must not be operated if the
vehicle's engine is not running.
While the antenna is designed to stay in place at speeds of up to 70 m.p.h.,
Neptune recommends operating the MRX920 at speeds not to exceed the legal limits.
For optimal performance, the MRX920 should not be operated at speeds greater than
30 m.p.h.