Can’t do that - with the iMac the power supply is built in…it’s an all-in-one.
On 5 Jun 2016, at 2:42 PM, Buck via Elecraft <[email protected]> wrote: Here is the authority on the issue. http://audiosystemsgroup.com/RFI-Ham.pdf Have you put ferrite on the cables from the iMac and the switching power supply? You've used "star" grounding around the KX3. Try bonding everything to everything - you want to provide a low-impedance parallel path from case to case everywhere there is a connection. So, there should be a bond between the soundcard and the iMac and the soundcard and power supply. Also the iMac and soundcard to the PX3. Your diagram should look more like a spider web. Are the interconnecting cables grounded to the chassis or the circuit board? You'll have to open some things up and see if there is the "pin 1 problem" where the cable's ground is on the circuit board and not the chassis. I would look for a YouTube video on how to open up that iMac. I am sure someone has posted one. K4ia Buck Honor Roll 335 8BDXCC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
