[RFI] Laptop Car Adapter Power Supplies

[Jimk8mr@aol.com]

For my mobile contest operations in the past few years I have been powering 
my laptop with an 12VDC to 110VAC inverter that runs the usual 110VAC power 
supply.  Not surprisingly, the inverter can be a major RF noise generator.  

Does anyone have RFI experience with the 12 volt car adapter power supplies 
for laptops?  Are they quieter than the typical 12-110VAC inverters?  Are 
there differences between models? Any other issues relevant to using them in 
the presence of 100 watts of HF RF a few feet away?

Tnx & 73,

Jim   K8MR