[RFI] ISOBAR

[Roger (K8RI)]

On 9/19/2012 9:00 PM, Michael Coslo wrote:
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> On Sep 19, 2012, at 5:18 PM, Roger (K8RI) wrote:
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>> And a really close strike can induce substantial voltages in interconnecting wires.  A lightning strike a mile away can induce well over a 1000 volts per meter of wire so think what a close one can do. How much wire is just in the walls of the house?
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> Sounds familiar. At our Mountaintop facility, we unplug all the radios, disconnect all the antennas from a patch panel when not in use. should be enough……….
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> Last year, several pieces of equipment, two of the radios, three computers, and several interfaces and a TNC were taken out by a very near strike. The point of ingress was the router system for our network. Went through the wires to the computers, then the USB to serial convertors and into the radios. Fun stuff.
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Normally the interconnecting wires in a station, are shielded with the 
shields grounded at both ends, but newer rigs have unshielded, multi 
conductor control leads for auto band switching, antenna switching, amp 
selection, and computer control.  Many of these apparently suffer from 
the pin 1 or something akin to the pin 1 problem.  So, in theory you can 
get a 1000 volts or more just between two pieces of equipment not 
connected to antennas or the power mains.

73

Roger (K8RI)


> 	- 73 de Mike N3LI -
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