[Elecraft] [KX3/PX3] Bonding

[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 to go to a
> Windows computer, I’ll live with the noise or build a Hackintosh. I
> also use this computer for other things - editing video, etc.

No comment on the Hackintosh. :-)  Finding the chassis in the "Golden 
Days of Ham Radio" was a trivial exercise, and all the "grounds" went to 
the chassis, which was universally conductive ... and usually heavy. 
Finding "chassis ground" in today's computers is somewhat different, and 
much harder.  Occasionally, I've found the DE-9 or DB-25 hold-down nuts 
approximate a chassis ground, but not always, and even stuff from when I 
still felt young no longer has D<anything> connectors anyway.

Beware also of the K9YC Pin One problem ... nowadays, even if there is 
what looks like a chassis, it may not be what you're looking for.

> 1. Bond the KX3 to the power supply. 2. Bond the KX3 to the PX3. 3.
> Bond the KX3 to the computer (somehow). 4. Bond the KX3 to the sound
> card (in my case, a Focusrite 2i2).

Theory says to ground [assuming you can find it] at one point and keep 
the straps from each device as short as possible.  Point-to-point can 
create loop-throughs, again see K9YC's info at audiosystemsgroup.com

Practice often differs from theory, however.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org