Filters react quickly to block spikes

Patented filter technology from PolyPhaser can make a difference of 700V less arriving at equipment input during a lightning strike.

Patented filter technology from PolyPhaser can make a difference of 700V less arriving at equipment input during a lightning strike.

Gas tubes and quarter-wave stubs are typically "DC continuity" devices, and high voltage spikes can occur before the gas in the tube has time to ionise.

PolyPhaser offers the SX series filters, which have no gas tube, and are "DC blocked" providing maximum protection for RF equipment, with a typical let-through energy of less than 500pJ.

The weatherproof SX is easily fitted to the antenna coax or equipment input using N-type or DIN connectors, is maintenance-free and protects against multiple strikes.

PolyPhaser's patented SX series designs are characterised by their broadband performance over wide a spectrum of frequencies.

The operating bandwidth of a single device covers frequencies from 700 to 2500MHz.

These low "Q" cavity-based designs are tuned LC networks and operate on bandpass/band-reject principals.

Contrasting the quarter-wave stub's design concept which capitalises on a DC short principal, PolyPhaser's SX series employs a patented DC blocking "mechanism".

The dielectric voltage breakdown on the centre pin of a DC blocking mechanism is in excess of 30kV for a surge condition.

Using the DC blocking capacitive component in the centre pin and inductive current discharge circuit to shield/ground ensures not only broadband RF performance but also outstanding surge suppression characteristics.

The attenuation of lightning frequencies by the SX series is phenomenal and reaches levels of -98dB or better.

Surge voltage let-through and the energy let-through of an SX series device as tested to the 6kV/3kA wave shape are as follows: 195.313mV and 6.26pJ.

(Energy is 1 million times less than quarter-wave stubs).

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