Optimus 31-3039, Owner'S Manual

Page: 12 / 32

12
Preparing Your Receiver
For the best radio reception, use an outdoor antenna. Follow these steps to
connect an outdoor FM antenna to the receiver using 75
Ω
cable.
Note: If your antenna has 300
Ω
twin-lead cable, consult your local RadioShack
store for the correct adapter.
1. Disconnect the supplied FM antenna from the receiver’s
FM UNBAL 75
Ω
terminal.
2. With a stripping tool, remove about 1 1 /
2
inches of the outdoor antenna ca-
ble’s outer insulation to expose the cable’s shielding.
3. Fold back the outer insulation from the inner insulation.
4. Remove about 1 inch of the inner insulation from around the center wire.
5. Pull the shielding to one side. Connect the center wire to the receiver’s
FM
UNBAL 75
Ω
terminal. Twist the shielding to secure any loose wire strands,
and connect it to the (ground) terminal.
Note: Grounding is not necessary for reception, but we recommend it to avoid
damage from lightning when you use an outdoor FM antenna and for better FM
reception. Use a separate piece of thick polyvinyl insulated wire to connect the
terminal to an earth ground such as a metal cold-water pipe.
Warning: Never connect a wire to a gas pipe for grounding since sparks might
ignite the gas.
Warning: To prevent injury, read and fol-
low all cautions and warnings that ac-
company the outdoor antenna.
Caution: The cable’s shielding should
only touch the
GND
terminal.
FM
UNBAL
AM
LOOP
ANTENNA
75
ANTENNA
Inner Insulation
Outer Insulation
Shielding
Center Wire
75
Ω
Coaxial Cable
Center Wire
Shielding