This would be hard but I can see how that could happen. The KX3 and the laptop use 2 prong connectors and this still happens, the macbook pro has a grounded power plug but this still happens.
The stupid thing is they all share the same power board, so in theory they should all be sharing the same green wire. However The KX3 chassis is connected to a ground system independent than the electrical ground, the same way I thought hams connected their radio equipment to ground (through a ground rod). The problem I have is that I live near KVA power lines, and they induce a current on the shield of the coax, which if I dont ground the KX3 causes electrical build it which I can sense with my finger. So given what you have said the ground of the KX3 chassis is connected to the ground system for the radio, and this is causing the loop. However this means I cannot do what you suggest, as the ground in all the plugged elements is already connected to the green wire, except the KX3 whose power supply is a double isolated, except the chassis which is connected to the radio ground. I do not know how to solve this, my only work around for this would be to try to isolate the incoming current with arrestors at the entrance of the shack, but that might not get rid of this current. Regards On Thu, Sep 1, 2016 at 3:06 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: > Loop is absolutely the wrong way to view this problem, and transformers > are NOT the easiest or cheapest solution. > > The solution is 1) proper chassis-to-chassis BONDING between all of the > equipment being interconnected and 2) get power for all of the > interconnected equipment from the same mains outlet, or from outlets that > share the same "green wire" (what is called the "protective earth" in > Europe). > > 73, Jim K9YC > > . On Wed,8/31/2016 1:58 AM, Andrew Hebden wrote: > >> This sounds like a 'hum loop' problem, the scourge of audio enthusiasts. >> In effect there are two earth connections between the KX3 and PC and it >> forms a small loop aerial where by it picks up mains interference. You >> could >> try running the cables from the KX3 to the PC very close together. >> It doesn't affect most people but I did get this problem a bit ago, but >> not >> with my KX3. The solution for me was to fit two small audio isolation >> transformers (one for each channel) in the IQ line, fitted in a small >> project box, and the problem went away. This has long been the recommended >> procedure for most audio lines between a PC and a rig. >> > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@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 enzo.adrianre...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@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 arch...@mail-archive.com
