Dear Jez,

I completely agree with what you say that HF is generated due to switching and by proper design of system like shielding, faradays cage and no ground loop one can beat these emissions. I have been using all this in my design and never had any problems. But how to convince my friend He doesnt believe in what people say he want concrete theory or relationship. He argues that you have noise generated in swithing only if load is inductive and you can simply forget this dv/dt and radiated emissions if load is resistive. He has some vague cocepts in his mind and not ready to agree. I want to explain him with some concrete evidence so that he agree. Please help me.

Thanks & Regards,
Prahlad Purohit