A high-end video or audio gate intercom system is useless if visitors press the buzzer and hear nothing but dead air. If you are constantly dealing with residents or delivery drivers complaining about being locked out, you need to understand why gate intercom systems lose connection.
Unlike a hardwired bell, GSM and 4G intercoms rely on cellular networks. Here is why they fail.
1. The “Faraday Cage” Gatepost
Many premium gates are built with heavy steel, aluminum, or wrought iron pillars. The intercom unit is often recessed into this metal housing. Metal acts as a Faraday cage, blocking radio waves from reaching the antenna inside the intercom, severely degrading the cellular signal.
2. High-Bandwidth Video Bottlenecks
Modern video intercoms (like those from Ring, Hikvision, or DoorBird) require significant upload bandwidth to stream video to your phone. If the intercom is fitted with a single-network SIM and the local mast is congested or only providing a weak 3G signal, the video stream will fail to initialize, causing the call to drop.
3. Weather and Environmental Degradation
Gates are highly exposed. Heavy rain absorbs cellular frequencies (Rain Fade). In summer, trees near the gate burst into full leaf, creating a dense, wet, physical barrier that blocks signals from the local mast.
The Multi-Network Fix
If you are an installer returning to the same site repeatedly to troubleshoot dropped calls, the solution is to remove the reliance on a single, fragile network connection.
Equip the intercom or the gate’s 4G router with an Anywhere SIM. Our unsteered multi-network SIM cards dynamically scan the environment. If the EE signal is blocked by wet summer foliage, the SIM will automatically drop it and switch to a low-frequency O2 mast that can punch through the trees and the metal gatepost housing.
Ensure your intercom always rings. Upgrade to failsafe multi-network connectivity.