[Elecraft] [KX3/PX3] Bonding

[John]

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 <elecraft at mailman.qth.net> 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
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