Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Brian Inglis
If microwave ovens could be an issue, could current popular mobile phone/tablet (Qualcomm Snapdragon, Samsung Exynos, Apple A7/M7) and low power desktop (Intel Core) processors running at nominal 1.4GHz also be an issue? On 2015-12-05 09:06, Tom Van Baak wrote: Jim, Check IF level and H2 pres

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Poul-Henning Kamp
In message , Azelio Boriani writes: >How are related the three locations' jumps? >Do they occur at the same time? If so, don't miss the Nobel Prize potential :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Tom Van Baak
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

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Bob Camp
Hi > On Dec 5, 2015, at 5:45 AM, Poul-Henning Kamp wrote: > > > In message > > , Jim Palfreyman writes: > >> 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. > > Is there a direct

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Attila Kinali
On Sat, 5 Dec 2015 12:16:44 +1100 Jim Palfreyman wrote: > Has anyone here who is familiar with hydrogen masers ever experienced a > sudden jump in phase of the 5MHz output? [...] > 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.

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Azelio Boriani
How are related the three locations' jumps? Do they occur at the same time? One more than the others? On Sat, Dec 5, 2015 at 11:45 AM, Poul-Henning Kamp wrote: > > In message > > , Jim Palfreyman writes: > >>The weird thing is that the jump is ~0.7ns and that 1/0.7E-9 is close-ish >>to

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Magnus Danielson
Jim, On 12/05/2015 11:45 AM, Poul-Henning Kamp wrote: In message , Jim Palfreyman writes: 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. Is there a direct digital divider chain to

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Poul-Henning Kamp
In message , Jim Palfreyman writes: >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. Is there a direct digital divider chain to the PLL which steers the 5Mhz OCXO ? If so the obvious t

[time-nuts] Hydrogen maser frequency jumps

2015-12-04 Thread Jim Palfreyman
Hi all, 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.