Ranger RCI-5054DX - Manual (Page 3)

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Chapter 3 Installation
The RCI-5054DX is easy to install. All necessary parts (less the
antenna and coax cable) have been included to facilitate
installation.
Transceiver Mounting
Choose a suitable location for the transceiver that will allow easy
access to the front panel as well as proper air circulation to the
back of the unit. If you are installing the unit in a vehicle, attach the
mounting bracket first, then attach the transceiver to the mounting
bracket using the hardware provided. Before making any electrical
connection, ensure that the transceiver is turned off and the
vehicle's battery is disconnected.
Power Connection
The transceiver operates off of any 12 to 13.8 VDC source.
Beware of voltage drops caused by operating from Cigarette Lighter
Plugs or long DC wire runs. Sometimes it is best to connect direct
to the battery for best RF output and Tx audio quality
If an AC power supply is used with your radio, it must be regulated
and rated for at least 7 Amps continuous. Low voltage while under
load will cause reduced receiver gain and low transmitter output
with possible distortion and splatter.
NOTE
The condition of a vehicle's electrical system can affect the operation of
your RCI-5054DX.. A low battery, worn generator/alternator, or poor
voltage regulator will impair performance of the unit as well as the
vehicle.
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CAUTION
Voltage above 15 VDC will damage the unit. Be sure to check the
source voltage before connecting the power cord.