Connecting a projector and a laptop with an HDMI cable, what’s the maximum allowed length? Will it work for me at a distance of 20 meters?

Connecting a projector and a laptop at a distance of 20 meters using an HDMI cable is technically possible, but requires careful consideration to ensure stable transmission of a high-quality signal.

Key factors to consider:

• HDMI Cable Quality: Use a high-quality cable with proper shielding, certified to support high data transfer speeds (High Speed or Premium High Speed). This will minimize signal loss and interference that can occur over long distances.
• Resolution and Refresh Rate: Extremely high resolutions (4K and above) and high refresh rates can be problematic at a distance of 20 meters, even with a quality cable. Be prepared to potentially lower these settings for stable operation.
• Active/Amplified Cables: Consider using active or amplified HDMI cables, which have built-in components to boost the signal. This can be an optimal solution for ensuring a reliable connection over long distances.
• HDMI Extender over RJ45 Twisted Pair: If you already have network infrastructure in place, an HDMI extender over RJ45 twisted pair can be an excellent alternative. It allows you to transmit HDMI signals over long distances (up to 100 meters) using ordinary network cables. This ensures stability and reliability of transmission even at long distances.
• Alternative Technologies: If signal transmission stability is critical and an HDMI cable doesn’t provide the required quality, consider other alternative technologies such as wireless HDMI transmitters or HDBaseT.

Recommendations:

• Testing: Before final installation, thoroughly test the connection at the full cable length with different resolution and refresh rate settings.
• Consultation: If you have any doubts or problems, contact an audiovisual systems specialist for professional advice and assistance in choosing the optimal solution.

By following these recommendations and taking a careful approach to equipment selection, you can successfully connect your projector and laptop at a distance of 20 meters, ensuring high image quality and stable system operation.