Posted: Sun May 23, 2004 7:30 pm
Richard
Hi-res digital photos of a display is a step in the right direction. You mention moving AC cords around affecting audio. Maybe they affect video too. How well do you control the arrangement of your line cords when inserting/removing a power conditioner/synthesizer? There is an allowed amount of radiated and conducted noise on power cords. In emissions tests, the cords are supposed to be arranged to 'maximize' radiation. In reality, this is difficult to do. It is quite possible to have a line cord arranged in a particular way where it 'resonates' at a frequency right where there is a noise frequency. The levels could be several dB above the limit. If this is in the bandwidth of a signal, it could get into a signal cable that is insufficiently shielded or poorly connected.
Believe it or not, the two of us would probably have a hell of a lot of fun working on this together, trying to unravel the mysteries. Let me take a moment to apologize to you and anyone else offended by my remarks. It could use a little toning down on my part.
emc guy
Hi-res digital photos of a display is a step in the right direction. You mention moving AC cords around affecting audio. Maybe they affect video too. How well do you control the arrangement of your line cords when inserting/removing a power conditioner/synthesizer? There is an allowed amount of radiated and conducted noise on power cords. In emissions tests, the cords are supposed to be arranged to 'maximize' radiation. In reality, this is difficult to do. It is quite possible to have a line cord arranged in a particular way where it 'resonates' at a frequency right where there is a noise frequency. The levels could be several dB above the limit. If this is in the bandwidth of a signal, it could get into a signal cable that is insufficiently shielded or poorly connected.
Believe it or not, the two of us would probably have a hell of a lot of fun working on this together, trying to unravel the mysteries. Let me take a moment to apologize to you and anyone else offended by my remarks. It could use a little toning down on my part.
emc guy