Doc: The reason for the DC Block is that the protector device (gas tube,
MOV, or whatever) conducts once a certain voltage is reached. By blocking
DC, the voltage across the protector rises faster and it starts conducting
at a much lower energy point of the discharge, keeping more energy out of
the equipment. Offers extra protection for receivers. The situation for the
tower mounted preamps mentioned by Frank, where the protectors pass DC, in
the amp, the pickoff for power blocks the DC so the lightning protector does
not need the block to achieve the same level of protection. --Mike, WV2ZOW
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