> Thanks, John! > > On Sep 6, 2011, at 1:47 PM, John Ford wrote: > >>> Hi, John, >>> >>> That's very interesting. How does this compare with a laptop or other >>> PC? >>> Why was it tested with the lid off? Is that how it will be deployed? >> >> Laptops and other PCs are a different kettle of fish altogether. They >> have a wide range of emissions, and most of them have emission about 40 >> dB >> above the ITU limits at the distance of the lab here. > > This may border on heresy, but I wonder if there is a way to dither the > PPC clocks to spread out the emission? Maybe a "cure" worse than the > "disease"! :-)
This is a ploy to fool the tests, since a spectrum analyser is sweeping, and measuring only one frequency at a time, so the average power measured in each frequency is less, but the total power in the clock is still the same. IMO! John > > Dave > >
