Gas-Tube Coax Lightning ProtectorsMay 4th Fact-of-the-Day
Some gas-tube coaxial cable lightning protectors fire at a relatively low voltage if a test voltage is increased gradually from zero. However, lightning-induced antenna voltage spikes typically have extremely fast rise times. Because of that, coaxial cable center-conductor to outer-shield voltage often exceeds 1,000 volts before a gas-tube lightning protector has time to ionize and fire. A 1,000-volt antenna-terminal spike will seriously damage most receiver input circuits unless some additional means of protection is provided. ©2005 Martek International All rights reserved.
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