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 75Ω cable.

Note: If your antenna has 300Ω twin-lead cable, consult your local RadioShack store for the correct adapter.

1.

Disconnect the supplied FM antenna from the receiver’s FM UNBAL 75Ω

Inner Insulation

terminal.

2.

With a stripping tool, remove about 11/2 inches of the 75Ω cable’s outer

 

insulation to expose the cable’s shielding.

3. Fold back the insulation from the inner insulation.

 

Center Wir

Outer Insulation

4. Remove about 1 inch of the inner insulation from around the center wire.

 

Shielding

Caution: The cable’s shielding should only touch the GND terminal.

5.Pull the shielding to one side. Connect the center wire to the receiver’s FM UNBAL 75Ω terminal. Twist the shielding to secure any loose wire strands, and connect it to the GND terminal.

FM Outdoor Antenna

Shielded

Core

 

FM

AM LOOP

 

UNBAL

ANTENNA

75

GND

GND

ANTENNA

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.

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Optimus STA-3500 owner manual Terminal
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STA-3500 specifications

The Optimus STA-3500 is a high-performance, compact stereo amplifier that has gained popularity among audiophiles and home theater enthusiasts. Known for its exceptional sound quality and robust construction, the STA-3500 is designed to deliver impressive audio performance without compromising on style or functionality.

One of the standout features of the STA-3500 is its efficient Class D amplification technology. This technology allows the amplifier to deliver high power output while maintaining low heat generation and energy consumption. The STA-3500 can produce up to 50 watts per channel into an 8-ohm load, making it suitable for driving a wide range of speakers, from compact bookshelf models to larger floor-standing units.

The amplifier is equipped with advanced circuitry that ensures minimal distortion and enhanced audio clarity. It utilizes sophisticated filtering techniques, which contribute to a clean, dynamic sound, making it an excellent choice for music enthusiasts who demand the best audio experience. The STA-3500 also features a wide frequency response, allowing it to reproduce low bass notes and high-frequency details with precision.

In terms of connectivity, the STA-3500 provides multiple input options, including RCA and AUX inputs, making it versatile for various audio sources such as CD players, smartphones, and TVs. Additionally, it includes speaker outputs that are compatible with standard banana plugs, spade connectors, or bare wire, ensuring seamless integration into any audio setup.

The build quality of the STA-3500 is another highlight. The amplifier is housed in a sturdy metal chassis that not only enhances its durability but also helps reduce electromagnetic interference. Its sleek design, complete with a brushed aluminum front panel, allows it to fit elegantly into any contemporary audio system.

Lastly, the Optimus STA-3500 features user-friendly controls, including a volume knob and input select switch located on the front panel. This accessibility makes it easy for users to adjust settings on the fly, enhancing the overall listening experience.

In summary, the Optimus STA-3500 is a powerful and compact stereo amplifier that combines advanced Class D technology with high-quality construction. With its impressive power output, minimal distortion, and versatile connectivity options, it stands out as a top choice for anyone looking to elevate their audio experience.
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