Installation, Mobile antenna, Ground information – Uniden PRO 500D User Manual
Page 5: Negative ground s^em, Positive ground system, Ground information negative ground s^em
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Installation
Plan the location of the radio and microphone bracket before starting installation.
Select a location that is convenient for operation and does not interfere with the
driverorpassengerinthe vehicle. The radioshould be securely fastened to a solid
surface using the mounting bracket and self-tapping screws which are provided.
Mobile Antenna
Since the maximum allowable power output of the transceiver is limited by the
D.O.C., the antenna is a very important factor affecting transmission distance. It is
for this reason that we strongly recommend that you install only a quality antenna
in your new C6 radio system. You have purchased a superior quality transceiver.
Don't diminish its performance by installing an inferior antenna.
Only a properly matched antenna system will allow maximum powertransferfrom
the 50-ohm transmission line to the radiating element. We recommend that you
use an SWR meter when installing your antenna. Set your PRO 500D to channel
20 and make adjustments to the antenna until the meter reads as close to 1 as pos
sible. Your Uniden dealer is qualified toassistyou in the selection of the proper an
tenna to meet your application requirements.
For automobile installation, the whip antenna maybe used with good effect. The
most efficient and practical installation is a full quarter wave whip antenna
mounted on the rear deck or fender top, midway between the rear window and
bumper.
A short "loaded" whip antenna is more convenient to install on your automobile,
although the efficiency is less than a full quarter wave whip antenna.
For marine installation, consultyour dealer for information regarding an adequate
grounding system and prevention of electrolysis between fittings on the hull and
water.
Ground Information
Negative Ground S^em
If you are operating on a negative ground system, connect the red DC power cord
from the radio to the positive "-f" battery terminal or other convenient point and
connect the black power lead to the chassis or vehicle frame, or the negative "
terminal of the battery.
Positive Ground System
If you are operating on a positive ground system, connect the black DC power
cord from the radio to the negative "—"battery terminal or other convenient point
and connect the redpower lead to the chassis or vehicle frame, or the positive "-I-"
terminal of the battery.
Most newer cars and small trucks use a negative ground system, while some older
cars and some newer larger trucks may use a positive ground system. A negative
ground system Is generally identified by the "—"battery terminal being connected
to the vehicle motor block, but if you cannot determine the polarity of your vehi
cle, consult your vehicle dealer for information.
NOTE: This radio may be installed and used in any 12-volt DC negative or positive
ground system.