Why interference happens
The most common cause is insufficient isolation between the donor and service antennas. The service antenna transmits into the donor antenna, the signal circulates and the booster oscillates. This can reduce coverage, trigger alarms or affect the network.
How to avoid it
Keep physical separation, use walls or roof structures between antennas, reduce gain if needed, and confirm the isolation margin before increasing output. AGC/ALC helps but does not replace correct installation.
- Follow the manufacturer’s minimum antenna separation
- Aim donor and service antennas away from each other
- Use the lowest gain that meets the coverage target
- Check for alarms and oscillation during commissioning
- Follow local operator and regulatory requirements
Booster vs jammer
A booster receives a weak outdoor signal, amplifies it in the licensed band and distributes it indoors. A jammer transmits noise or interference to block communications. Jammers are illegal in most countries and can disrupt emergency calls. We do not supply jammers.
Need help with isolation or interference?
Share the site conditions and we will reply with a preliminary assessment and the measurements still needed.
Frequently Asked Questions
Is a signal booster legal?
It depends on the country and the installation. Many markets allow boosters with type approval and operator coordination; others restrict them. Confirm local rules before importing or installing.
Can I use a jammer to block unwanted calls?
No. Jammers are illegal in most countries and can interfere with emergency and public communications. They are a different product category from signal boosters, and we do not supply them.
What causes a booster alarm?
Low isolation, excessive gain, a strong nearby signal or a faulty antenna/cable connection. Check antenna separation first, then gain and connectors.