Kathrein EMU 21 F-Grounding Block 1-way

With a shielding effectiveness exceeding 100 dB and a surge current capability of 2.5 kA (8/20 µs), the Kathrein EMU 21 F-Grounding Block delivers robust potential equalization and lightning protection for coaxial cable runs in satellite and broadband installations.

Overview

The EMU 21 is a single-port F-type grounding block engineered to safely divert surge currents to ground while maintaining signal integrity across a wide 5–2400 MHz frequency range. Its die-cast zinc housing and screw terminal for conductors up to 6 mm² ensure a durable, low-impedance bond in both indoor and outdoor environments.

What stands out

• High surge handling: 2.5 kA (8/20 µs) for reliable lightning protection.
• Broadband performance: 5–2400 MHz with insertion loss under 0.5 dB and return loss better than 18 dB.
• DC pass-through allows remote powering of LNBs and line amplifiers.
• Robust die-cast zinc body with screw mounting for secure installation.
• 75 Ohm impedance matches standard coaxial systems.

Technical details

• Product type: F-Grounding Block, 1-way
• Connector: F-female (input/output)
• Frequency range: 5 – 2400 MHz
• Impedance: 75 Ohm
• DC passage: Yes
• Shielding effectiveness: > 100 dB
• Insertion loss: < 0.5 dB
• Return loss: > 18 dB
• Grounding terminal: Screw terminal, up to 6 mm² wire
• Mounting: Screw mounting
• Housing material: Die-cast zinc
• Operating temperature: -20 to +50 °C
• Surge current capability: 2.5 kA (8/20 µs)

Our verdict

The Kathrein EMU 21 combines high surge resilience with minimal signal loss, making it a dependable grounding solution for professional satellite and cable networks where protection and performance are equally critical.