I forgot to mention: When on-the-air, WWVB produces a nice, clean signal, at -51 dBm (at the higher of it's two shifted amplitudes) as output from my Kinemetrics active antenna (and measured by both a HP 3586C in 20Hz BW and a HP 3585A in 30Hz BW), here in Colorado Springs. When the WWVB signal disappears, those same measurements drop to a noise floor in the range -80 to -129 dBm, depending on residual 60kHz noise/interference in my neighborhood.
Greg ----- Original Message ----- From: "Greg Burnett" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Friday, December 26, 2008 12:50 PM Subject: [time-nuts] WWVB Outages? Have any of you noticed intermittent WWVB outages lately? I've been having that problem, every once in a while, the past month or more. For example, here in Colorado Springs, the 60 kHz signal disappeared sometime this morning before 11:42AM MST, and returned at 12:28PM MST. When this happens it kills my routine plot of my GPS-disciplined house standard against WWVB (that I use for in-house cross-checking / confidence purposes). I'm using a Kinemetrics Model 60TF WWVB Frequency Comparator / Receiver, that requires a continuous WWVB signal. (This is unlike the consumer "Atomic Clocks" that the public use; those kinds of WWVB-locked clocks do *not* require a continuous on-air signal, but rather "flywheel" in between scheduled locks a few times per day, as I understand it?) Cheers, Greg _______________________________________________ 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. _______________________________________________ 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.
