You're exctly right. The thing was, the first spread spectrum clock oscillator (I'm not a fan of those) had a narrower "spread" and didn't cause the problem. It was when we widened the spread, to get the emitted noise spikes lower, that the ghost images started showing up.
Steve, actually you just had to follow the 4 rules of fault-finding for technicians. It's under rule 4. The rules are - 1)Turn it off, turn it on again 2)hit it 3) read the data sheet 4) look for the problem at the last place you touched before it stopped working. That usually solves 97% of all problems.
You're right, Batter. And I think the 97% statistic for step #4 is pretty close. In this case the problem was on a board 5 slots away on the backplane and some time had elapsed since the previous design change. Regarding the pesky spread spectrum clock oscillator, we were probably thinking if a little is good, a lot will be better.
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