[Elecraft] IMac pro RFI

[David Herring]

Mike,

Anything else connected to the iMac?  You ruled out the keyboard and mouse, which is good...I have an iMac had the same problem and discovered it was my 'mighty mouse' that was the culprit -- seems the mighty mouse is a rather effective antenna!  Once I replaced the mouse with a generic mouse, I've never had another problem.  My iMac is within 2 feet of the rig and it's cabling.

If you can make her screen dance with as low as 3 watts, I can only guess you must have an unsuspecting radiator really close to the iMac?  I needed 40 - 50 watts to excite my mighty mouse!  Have you traced all wires in proximity to the iMac back to see if they come in close to feed lines, ground lines, or the rigs themselves?

What kind of balun do you use?  Is it a current balun?  Would help to reduce common mode currents on your feed line. 

Returning the computer for a refund seems a bit rash to me...the real problem I would think, is that there is some amount of RF at your wife's computing position coming from somewhere, so unless you're trying to fry her (hi hi), that really does need to be worked out despite there being other computers unaffected by it.

Good luck!

73,
Dave
AH6TD


On Aug 23, 2010, at 2:20 PM, Mike Weir wrote:

> 
> Greetings
> My wife just purchased a new Imac desktop and with my KX1, K2 and K3 I am causing her screen to jump all around. She has a laptop mac along side and it is just fine as well as her Ipad. The antenna I have is a dipole in the attic and the other antenna is the High Sierra sidekick in the backyard. The output can go as low as 3 watts and it still gives her Mac grief. I have removed the mouse and keyboard and it does the same thing. I have also put clamp on chokes on the AC line. It seems that it is the Imac that is giving me the trouble as my desktop in the next bedroom has no trouble what so ever at any power I can deliver to the rigs. Any help would be appreciated. 
> Mike
> VE3WDM
> 		 	   		  
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