Jim, Check IF level and H2 pressure. Also see if OCXO tuning is near a rail. Go back through the past month and look at trends on all the parameters. You are logging all channel data, I hope.
Also check your microwave ovens: http://arxiv.org/pdf/1504.02165v1.pdf ;-) Less technical links: http://www.nature.com/news/microwave-oven-blamed-for-radio-telescope-signals-1.17510 http://www.skyandtelescope.com/astronomy-news/microwave-ovens-spark-radio-signals-peryton-05122015/ http://phenomena.nationalgeographic.com/2015/04/10/rogue-microwave-ovens-are-the-culprits-behind-mysterious-radio-signals/ /tvb > Has anyone here who is familiar with hydrogen masers ever experienced a > sudden jump in phase of the 5MHz output? > > We have found they occur semi-regularly (few times a week) and are trying > to find a culprit. > > The weird thing is that the jump is ~0.7ns and that 1/0.7E-9 is close-ish > to 1420.4MHz which is the hydrogen line. Too much of a coincidence for me. > > These seem to be appearing at three different locations with the same model > of maser at each location. I won't mention the model publicly. > > We're still investigating various potential causes (e.g. power spikes, > cables being moved), but this 0.7ns figure is niggling me. > > Has anyone here ever seen such a thing before? > > > Jim _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
