QED: here is a phase noise plot of a 200ms 1PPS pulse showing up in the phase noise spectrum of a 10MHz source (at 1Hz to 10Hz offsets) because the unit was providing a 100mA current pulses into the cable, and power supply modulation of the 10MHz output happened inside the unit. The pulses would likely not be visible if they had been only microseconds long, or the cable was not incorrectly end-terminated and causing the massive DC current to flow. Yes, yes, the unit "could have been designed to handle that scenario", but the point is: modulation is going to happen, and could be "10's of Watts", and it will likely have some effect in one way or another. The discussion started with the question of why one would design short 1PPS pulses versus long pulses. This is one reason why. In a message dated 5/15/2012 14:24:07 Pacific Daylight Time, mi...@flatsurface.com writes:
On 5/15/2012 5:14 PM, saidj...@aol.com wrote: > it is the effect of what follows after that leading edge, and propagates > down the power supplies to cause side effects that is being discussed here. I'm asking "What side effects?" I haven't seen any mentioned. And really, if an increase in power draw of 10 watts for an entire lab environment causes any problems, I'd question the quality of the power supplies, and ask what happens when you simply turn on the light?
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