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Setting Up The Radio
Connecting the Antenna
Your UM625c has been designed to accommodate all of the popular marine VHF antennas.
However, the selection and the installation of the antenna is the responsibility of the user or
installer. A variety of antennas are available from a number of quality suppliers. In general,
we recommend an 8' antenna rated at 6dB for powerboats, and a 4' antenna rated at 3dB for
sailboats.
In general, you can increase your communication range by using a high-gain antenna placed
as high as possible above the water line. Locate the antenna away from metal objects. Keep
coax feed cables as short as practical.
The FCC has determined that excessive radiation poses a health risk to people near radio
transmitting antennas. Therefore, the antenna used with this radio should be installed using
the following guidelines to ensure a suitable distance between the antenna and persons
close by.
• Small whip antennas (3 dB or smaller) should be installed keeping at least 3 feet
separation distance between the radiating element and people.
• Larger antennas (6 dB or 9 dB) should be installed with at least a 6 feet separation dis-
tance.
• No person should touch the antenna or come closer than the separation distance when
the radio is transmitting.
To connect the antenna to the radio, screw its connector onto the antenna jack on the back of
the radio.
Connecting Power
1. Connect the red wire of the supplied power cord to the positive (+) side of your
distribution circuit or battery.
2. Connect the black wire of the supplied power cord to the negative (-) side of your
distribution circuit or battery.
Note: The power cord is equipped with a fuse to protect the radio. Use only a six (6) amp
fast blow fuse for replacement.
3. Connect the power cord to the keyed connector on the power “pigtail”.
Installation
Caution: The UM625c is designed to use a nominal 13.8 volt negative ground battery system
for power. Do not use a positive ground battery system to power the UM625c.
Keep in mind the flexibility designed into the UM625c so that you can most conveniently use
it. Features which should be considered are:
• The universal mounting bracket may be installed on either the top or bottom of a shelf, on
a bulkhead, or for overhead mounting.
Setting Up The Radio
Setting Up The Radio