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I remember year ago working with Barry to solve a noise related problem at one of my customers, similar thing, turn device A on device B stops working, device A and B not related.
Worked out that we a had a noise frequency harmonic in the power at some 19kHz when device A turned on, device B was running a data rate of 19200bps. Turning on device A was corrupting data on device B.
When we looked at the power with an oscilloscope we saw lots of noise harmonics at different at frequency mulitples from this device.
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