Rick, Since I don't make use of a sound card interface, I don't see the problem you mention. I do digital from time to time but use Signalink USB and have never noticed a problem.
I just measured the voltage and it is essentially zero between my iMac and my K3 grounds (using a Fluke 189 DVM). My iMac is plugged into my UPS but the UPS is plugged into the same power circuit as the Astron power supply that drives the K3. I also put both plugs of my Fluke meter on my ground strap to see if it had the same noise level (millivolt readings) as between the K3 and the iMac and it is indeed about the same. I am not sure though if the aluminum parts of my iMac are the true ground of the computer itself, that could very well be different. Only the newer iMacs have the aluminum (I think it is aluminum) frame, my older iMac had plastic all over the thing -- no metal that I could tell. peh On Apr 11, 2011, at 5:46 PM, Rick Prather wrote: > Yes, I do. I have a ground strap running from my iMac to the radio and can > tell the difference when using sound card modes. > > Just for fun you might take a Volt meter on low scale and check from the iMac > chassis to the radio chassis. You may be surprised at how much potential > difference there is. Especially if they aren't both plugged in to the same > house circuit (and even if they are) > > Rick > K6LE > > On 4/11/2011, at 4:39 , Phil Hystad wrote: > > > I mean, does anyone really >> do that? >> >> But, like I said, I do not have any hum, buzz, or RFI that I >> know of and if I don't know of it it certainly does not bother me. >> >> peh >> > ______________________________________________________________ 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
