[time-nuts] Hydrogen maser frequency jumps

[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 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 -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada