Coax surge and lightning arrestors
25 June 2014
Circuit & System Protection
DEHNgate (DGA) is a family of lightning current/surge arrestors designed as a cable adaptor for protecting coaxial systems such as CCTV, mobile radio stations and antenna systems from potential damage.
Hybrid filter technology ensures the device functions over a wide frequency range while offering high protection levels. The coaxial arrestor family comes in different designs to suit a wide range of applications.
The space-saving DGA FF TV can be mounted onto a DIN rail to protect video, camera and satellite systems with several outputs, and is available with direct (VCD) or indirect (VCID) shield connection to avoid ground loops. For single applications, such as broadband cable connections, the device can be simply snapped into a wall-mounted adaptor. The DGA FF TV arrestor has an integrated measuring output for antenna signals, allowing the system to be easily tested.
If a DC supply is required for the antenna system, such as for a remote radio head, electrical down tilt, tower top amplifier and so on, a hybrid arrestor such as DGA LG can be used. This device utilises a hybrid quarter-wave shorting stub and decoupled gas tube to pass the required RF frequencies while allowing DC to pass through the device.
DGA LG technology effectively provides three devices in one: a bandpass filter, and lightning protection for both RF and DC signals. Because the gas tube is decoupled from the shorting stub, the majority of the lightning energy is diverted to ground by the stub itself, allowing the gas tube to only come into action during a direct strike. This ensures the device will remain useable and maintenance free for more than 10 years.
The use of quarter-wave surge arrestors is advisable if high partial lightning currents could be coupled into antenna lines, or if very high transmission performances are required. If additional remote supply is needed for the antenna, a combination of a gas discharge tube and quarter-wave technology (DGA LG) should be used.
All DEHNgate arrestors are designed for superior RF performance in the signal path, offering very low VSWR (R/L) and, most importantly today, maximum PIM values of 150 dBc. The filter technology ensures that better than 99% of the energy from the strike will be safely sent to ground, ensuring safe and consistent system operation.
For more information contact Dehn Protection South Africa, +27 (0)11 704 1487, [email protected], www.dehn-africa.com
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