Re: [Elecraft] [KX3/PX3] Bonding

2016-06-06 Thread Fred Jensen
On 6/5/2016 5:03 AM, Joel Black wrote: I’m pretty sure I can bond the KX3, PX3, and MFJ-4125 but I don’t have a *clue* how to bond the iMac. It’s a late 2012 27” iMac. It’s an all-in-one with *no* external screws. It’s the model with the “pregnant” bulge in the back. However, if it means I have

Re: [Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread Walter Underwood
Get a big clamp-on ferrite and wrap the power cord through it as many times as will fit. Do that as close as you can to the back of the iMac. The iMac has a three-conductor power cord, so try and get all of the power cords for your equipment to a single power strip. This is a start at bonding

Re: [Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread Fred Moore
much noise comes from and iMac from the USB cables, beads will greatly reduce the noise... Fred On 6/5/16 9:35 AM, John wrote: > 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

Re: [Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread 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 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

Re: [Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread Don Wilhelm
Joel, Good progress. Yes, the roofing filter is not usable with the 8kHz shift engaged. This is not a firmware problem, it is a hardware problem. Think of it this way - the "IF" for the KX3 is at baseband (audio frequency range), and that is where the roofing filter works - in other words,

Re: [Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread Buck via Elecraft
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

[Elecraft] [KX3/PX3] Bonding

2016-06-05 Thread Joel Black
I figured out most of my problems with all the spikes on the PX3 - the switching P/S in my iMac. To a lesser extent, I can hear the MFJ-4125 switching P/S I use to power the KX3 and PX3. I cannot remember if I tried looking at the spectrum using the Astron RS-35 as a power source and plugging