Just for grins, I switched the 5370A to external reference and used the 10 MHz from the Thunderbolt (through my cheap distribution amplifier) and the 10 MHz output of the 5370A did not change a bit (as seen on the scope). So the spikes in the waveform must be coming from the lack of selectivity of the output filter on the amplifier board. I believe I adjusted it to peak the amplitude, but that makes the little spikes occur near the zero crossing, which may not be good, I wonder if it would not be better to detune the circuit to make those spikes appear farther from the zero crossing? They would be less likely to affect the rest of the circuit.
Didier [EMAIL PROTECTED] wrote: > Hi Didier, > > thanks for the pics! Yes, the signals almost look the same. Your 10MHz > output is even a bit more noisy. On the Wavecrest set to Oscilloscope mode > (it can > work like a normal high-speed scope) I see the small humps around the zero > crossing appear and disappear quickly, so I think these are causing the > modulation, and hence the >200ps jitter. Not a clean sine-wave for sure. I am > glad > it's not just my unit. > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
