[Elecraft] VK9MT transmit audio distortion.

[David Cole]

I run a ground buss across the back of the radio desk, connect all rigs
to that, then connect that buss to a star ground which also goes to a
second bus running across the second level of equipment.  The star then
goes to ground.

-- 
Support better RFI practices, please sign this petition:
at Whitehouse.gov

http://wh.gov/lpz5Y




On Mon, 2014-04-07 at 09:35 -0700, Jim Brown wrote:
> 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.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to dave at nk7z.net