Antenna Surge Protector Prolech 5–2400 MHz, model 77-121

The Prolech Antenna Surge Protector 5–2400 MHz (model 77-121) is an inline coaxial protector designed for wideband RF systems. It protects antenna feeders and connected equipment from lightning-induced and transient overvoltages while maintaining signal integrity across a broad frequency range. The device is intended for use in TV, FM, DAB, DVB-T and satellite LNB lines as well as other RF applications that require overvoltage protection for coaxial cables.

Advantages

The Prolech protector provides wideband protection covering 5–2400 MHz, enabling a single device to safeguard multiple types of services on the same feeder. Its inline design allows simple insertion into existing coax runs without complex reconfiguration. The unit is engineered to divert surge energy away from sensitive receivers and tuners, preserving downstream equipment and minimizing downtime. Construction and RF path are optimized to maintain low insertion loss and good return loss across the specified band.

Suitable for

• Protecting terrestrial TV (DVB-T/T2) antenna lines
• FM and DAB radio antenna feeders
• Satellite LNB protection on coax runs (wideband)
• Wideband RF distribution systems and test setups
• Residential and small commercial antenna installations

When it may not be suitable

This surge protector is intended for coaxial antenna systems operating within 5–2400 MHz. It is not suitable for protection of DC power lines, Ethernet/network cabling, or other non-coaxial signal paths. For systems that require certified protection levels for high-energy lightning direct strikes or where specific lightning protection standards must be met, more comprehensive grounding and external lightning protection measures may be required in addition to this inline device.

Key specifications

• Frequency range: 5–2400 MHz
• Application: coaxial antenna feeders for TV, FM, DAB, DVB-T, satellite LNB and wideband RF
• Installation type: inline coaxial insertion in RF feed line
• Function: transient and lightning-induced overvoltage diversion to protect receivers and tuners
• RF performance focus: low insertion loss and preserved signal integrity across specified band

How to use

Install the Prolech surge protector inline on the coaxial feeder between the antenna (or LNB) and the receiver/tuner. Ensure connectors are properly tightened to maintain good RF contact and weatherproof any outdoor connections according to local practice. The protector should be mounted with consideration for grounding: connect the device’s outer conductor or dedicated grounding point to a suitable earth ground if the unit design provides a grounding terminal or path. Verify signal levels after installation to confirm minimal insertion loss and normal reception of services.

What to consider before purchase

• Confirm the antenna system operates within the 5–2400 MHz frequency range.
• Ensure coax connector types and mechanical form factor match your existing feeder and installation space.
• Assess grounding arrangements at the installation site and whether additional external lightning protection is needed.
• Recognize that the device protects coaxial RF lines and is not a substitute for protection on other cabling types or for direct lightning strike mitigation.

Usage recommendations

For best results, install the surge protector as close as practical to the entry point of the coax into the building or near the equipment it protects, and ensure proper earthing of the protector and mast. Periodically inspect outdoor connections for corrosion and re-tighten connectors if signal degradation is observed.