Distributing TV Aerial Signals: Passive Splitters vs Active Amplified Distribution Boxes

When it comes to distributing TV aerial signals throughout a home or commercial premises, there are two main methods available - using passive splitters or active amplified distribution boxes. Both have their merits and demerits, but understanding the differences between them is crucial in making an informed decision.

Passive Splitters

Passive splitters work by simply dividing the incoming signal from your TV aerial into multiple outputs without any amplification. They are typically made of a single piece of copper cable with a series of branches connected at regular intervals, creating multiple legs that lead to separate outlets.

The main advantage of using passive splitters is their simplicity and low cost. However, they also have several drawbacks:

• As the signal is split multiple times, each time losing some strength. This can result in a weak signal at the end of the distribution network.

• The splitting ratio (how many ways the signal is divided) affects the signal loss. For example, a 2-way splitter will lose half the signal, while an 8-way splitter will split it into eight equal parts, resulting in significant signal degradation.

• Passive splitters do not compensate for losses due to cable length or impedance mismatches, which can further weaken the signal quality.

Active Amplified Distribution Boxes

In contrast, active amplified distribution boxes use a built-in amplifier to boost the incoming aerial signal before splitting it into multiple outputs. This method helps maintain a stronger signal throughout the distribution network.

The advantages of using an active amplified distribution box include:

• Improved signal strength: The amplifier compensates for any losses incurred during transmission, ensuring that each output retains sufficient signal strength.

• Flexibility in cable length: With an amplified system, you can run longer cables without experiencing significant signal loss compared to a passive splitter setup.

• Compatibility with different aerial sources: Active distribution boxes are compatible with both terrestrial and satellite signals, making them versatile for various installation scenarios.

However, active amplified distribution boxes do have some drawbacks:

• They require a power supply, adding an extra layer of complexity and cost to the installation.

• The amplifier itself may introduce noise or interference into the signal if not properly shielded or configured.

Installation Checklist

When installing either a passive splitter or an active amplified distribution box, it’s essential to follow these key steps:

1. Consult with a qualified TV aerial installer to assess your specific requirements and recommend the most suitable solution for your needs.

2. Choose a high-quality coaxial cable with appropriate impedance (typically 75 ohms) to minimize signal loss and ensure optimal performance.

3. For passive splitter installations, limit the splitting ratio to maintain acceptable signal levels at each output. In general, avoid using more than four-way splitters if possible.

4. When using active amplified distribution boxes, select a model that is compatible with your aerial source (terrestrial or satellite) and has sufficient amplification gain to overcome any anticipated signal losses.

5. Ensure all connections are secure and properly shielded to prevent signal interference or loss due to loose terminations.

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