Quantcast Appendix A Glossary -Cont. - hdbk419a_vol20345

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THUNDERSTORM DAY -- A local calendar day on which thunder is heard.
UNDESIRED SIGNAL -- Any signal which tends to produce degradation in the operation of equipments or
WAVE IMPEDANCE -- The ratio of the electric field strength to the magnetic field strength at the point of
ZONE OF PROTECTION -- (also known as CONE OF PROTECTION) That space that is below and adjacent to
a lightning protection subsystem that is substantially immune to direct lightning discharges.


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