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> Radiall R445 coaxial lightning frequency filter qws
Radiall R445 coaxial lightning frequency filter qws
Radiall R445 Coaxial Lightning Frequency Filter QWS NR
Radiall Lightning Protector R445.111.890
Some RADIALL lightning protectors utilize a quarterwave stub design. This technology is based on a 3 port coaxial device. One of these ports is a metallic short-circuit between the inner and the outer conductors, whose length is one quarter of O wavelength at the centered frequency. Quarter wave protectors work like band pass filters. They operate within a specified frequency band. In normal use (i.e within the working frequency band), the RF signal flows through the quarter wave lightning protector to the protected equipment.
Whenever lightning hits the infrastructure (ex : Antenna mast), current will flow through the cable (feeder cable) to the lightning protector installed at the entrance to the critical equipment to be protected (Base Transceiver Station). As lightning strikes operate at low frequencies i.e outside of the protector working frequency band, current will be instantaneously diverted through the short-circuit to the ground.
Since it is a mechanical system, it can handle repeated surges. Any impulse at any time will always be shunted to the ground.Only a low residual voltage, less than 15V, can pass through the equipment.
* QUARTER WAVE STUB (QWS) PROTECTION
This unit is in great shape and has never been used. We could not find any frequency information.
