[Ham-Mac] Mac crashes on transmit or tune

[John Townend]

It would seem that the power switching on Macs is very prone to strong 
RF fields. I assume it is some form of remote semiconductor power 
switching within the Mac. My G3 iMac would auto switch on when 
transmitting above 10 MHz which was not a great problem as I run Hamlog 
anyway. My stack of 4 coax feeds pass within 6 inches of the computer 
so it was not unexpected.  The G3 has been replaced by a G4 flat screen 
iMac in its fancy plastic case and there are no problems in either 
direction. For the unfortunates it is a trial and error  situation - 
move cables around, lots of ferrite beads and get the stray RF down to 
a minimum
I would be interested if anyone knows how the power switching works on 
the Macs and is there some form of sequential switching to cope with
varying loads at boot up or shut down.  What do AppleMac say about it - 
there must be users other than amateurs who use Macs in RF fields.

John G3BBD/N3YZR