On 4/7/2014 6:26 AM, K4ia wrote:
Jim
Didn't you mean from chassis of every piece of equipment to ground?
No daisy-chaining.
No, I meant exactly what I said. The long-standing advice against
daisy-chaining chassis connections is WRONG. The logic for that advice
is that a connection forms a loop with the connection to whatever common
point is chosen, but those who give the bad advice forget that there are
point-to-point connections between the equipment in the form of coax
cables, audio cables, serial cables, and control cables. These cables
form a much larger loop, that results in far greater induced voltages,
and often the shields of these cables are not even connected to the
chassis, but to the circuit board inside the gear. That combination
makes it FAR more likely that a strike will cause lightning damage, both
because the loop area is greater and the connection is not to the
chassis. So short chassis-to-chassis bonding combined with a bond from
one of those chassis to the common point is the safest from a lightning
safety point of view, because it
minimizes the loop area.
The short chassis-to-chassis connection also minimizes the power
line-related leakage voltage between equipment that causes hum and buzz
when we connect that equipment using unbalanced connections.
73, Jim K9YC.
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