On 10/7/07, David VanHorn wrote: > On 10/6/07, Vasile Surducan wrote: > > I always liked PIC folklor, PCB folklor and electronic philosoply. > > An incomplete question will gent an incomplete answer. > > A dipole antenna is emiting a specific frequency. As long you have > > ground plane around the hole it can't be an antenna. > > That's not true. If current is flowing around the hole, and it's not > evenly distribuited, then there's a net magnetic field, and you're > radiating. A bit more detail here. There are indeed DC/DC converters in the center leg. And indeed the total current flowing around the holes are not evenly distributed. The top leg has higher current then the lower leg. So there are radiated emissions from the holes from your assertion. The spetrum analyser is not availble right now (I was doing the CE tests in Cleveland, Ohio for the first prototype). So I can not do much right now. Once it is available, I will do some tests. But the RF emission/immunity chambers will not be ready anytime soon in the Singapore labs (too expensive to set up rigth now). So the idea is to do evaluation in Singapore and do the qualification tests in 3rd party labs or in US. It is always easy to do the tests and troubleshooting in house so I'd prefer to fly to US for testing even though the long flight (20 hours+) is not that enjoyable. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist