But... many of us live in older houses, with iffy wiring and long 
distances among entrances of various services, making the sort of 
bonding you call for a major undertaking. By comparison, a couple of 
5-buck isolation transformers make a lot of sensefor the particular 
purpose Ed described.
73, Pete N4ZR
Download the new N1MM Logger+ at
<http://N1MM.hamdocs.com>. Check
out the Reverse Beacon Network at
<http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.
On 6/25/2015 11:33 AM, Jim Brown wrote:
 I suggest that anyone who believes they need isolation transformers 
study my tutorial on Power, Grounding, and Audio. All that is needed 
is simple good engineering practice for power distribution, equipment 
bonding, and grounding.
http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
On Thu,6/25/2015 7:20 AM, Ed Sawyer wrote:
 In my case - I found that separate isolation transformers were need 
on each
channel L/R to make it noise and "click free" as I changed radios.
  
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