Barrett PRC-4090 - Page 149

137
BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER - INSTALLATION
Air Circulation
The PRC-4090 relies on air ow around cooling ns to dissipate heat generated
by the transmitter. The mounting position must allow free airow around these
ns.
Obstruction
The installation of a transceiver into a vehicle should not inhibit the normal use
of the vehicle. Before selecting equipment positions, check that normal opera-
tion of steering, foot pedals, gear change, hand brake etc. are not impeded, and
that heater or air-conditioning outlets, glove box and doors are not obstructed.
Always check that the drilling of mounting screw holes will not damage electri-
cal wiring, heater hoses or hydraulic lines.
Power Wiring
Connect the red positive and black negative wires from the transceiver power
cable to the positive and negative terminal of the battery. Do not connect to
the ignition switch or internal fuse panels as vehicle wiring to these points is of
insufcient current capacity, causing voltage drop, possible noise interference
and damage to cables through overheating. To prevent this, consider the fol-
lowing:
• Route the power cable away from high tension ignition wiring.
• Secure the power cable, either to other wiring or the vehicle body, with
suitable cable ties.
• Where wiring passes through bulkheads, provide appropriate protection
to prevent insulation being damaged.
• If an isolation switch is tted between the battery’s negative terminal and
the vehicle chassis then it is important to connect the radio’s negative
supply cable to the chassis side of the isolation switch.
Grounding
Ideally the transceiver should be mounted as close as possible to the antenna
with a common grounding (earth) point being used for both the antenna’s
ground (earth) connection and the transceiver’s ground (earth) connection.
See page 142, page 145, page 144 and page 180 for additional informa-
tion regarding appropriate antenna grounding (earthing).