[Elecraft] VK9MT transmit audio distortion.

[Jim Brown]

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.