Optimus STA-3500 - Manual (Page 10)

10
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 75
Ω
cable’s outer
insulation to expose the cable’s shielding.
3. Fold back the 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 GND 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
GND 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.
Caution: The cable’s shielding should
only touch the
GND terminal.
Inner Insulation
Center Wir
Shielding
Outer Insulation
ANTENNA
GND
AM LOOP
ANTENNA
FM
UNBAL
75 GND
FM Outdoor Antenna
Shielded
Core