[time-nuts] 60 Hz line quirks, anybody recognize this stuff?
Bill Dailey
docdailey at gmail.com
Sat Sep 1 22:21:18 UTC 2012
Firefox is notorious for screwing up audio in windows. I have had OS of problems with this. I actually think its something o o with networking.
Sent from my iPad
On Sep 1, 2012, at 5:16 PM, Chuck Forsberg WA7KGX N2469R <caf at omen.com> wrote:
> On 09/01/2012 02:17 PM, Magnus Danielson wrote:
>> On 09/01/2012 08:35 AM, Hal Murray wrote:
>>> The context is using the 60 Hz line for timing.
>>>
>>> I'm feeding 60 Hz from a wall wart transformer into a modem control signal
>>> that the kernel PPS stuff watches. Mostly, it works as expected, but
>>> occasionally, it picks or drops a cycle.
>>>
>>> In order to understand what was going on, I fed the same signal into the
>>> audio input and setup a job to capture the audio. Here is an example of a
>>> pick:
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a1.png
>>>
>>> OK, that somewhat makes sense.
>>>
>>>
>>> Something happened several days ago. I used to get picks/drops rarely, say
>>> ballpark of 1 a month. Now I'm getting 10 or 20 per day. So I started
>>> looking closer.
>>>
>>> I'm now seeing stuff like this. I've got lots and lots of examples. I added
>>> a second PC with different hardware. It sees the same stuff.
>>>
>>> Does anybody recognize this?
>>>
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-a0.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-b0.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-c0.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-d0.png
>>> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-e0.png
>>>
>>>
>>
>> It's interesting to notice that you have about the same distance from the middle in all 5 examples. It's like you trigger a diode drop for a while. Notice that there is a small slope towards zero.
>>
>> Cheers,
>> Magnus
>>
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> I have noticed many stalls in Windows lately, possibly the result of Flash and Firefox not getting along.
> The first plot suggests a multitasking related problem.
>
> --
> Chuck Forsberg WA7KGX N2469R caf at omen.com www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
> Omen Technology Inc "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
>
>
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