[time-nuts] PPS pulse length

jimlux jimlux at earthlink.net
Tue Aug 14 18:29:07 EDT 2018


On 8/14/18 2:15 PM, Dana Whitlow wrote:
> Arecibo did a kind of cute trick with their distributed 1PPS.   The one
> second pulses were of one length
> (100 ns as I recall), but the 10 sec boundaries had the pulses be about
> twice that length.  One could carry
> this scheme to considerable lengths as desired.
> 


That's how IRIG works.. 3 different pulse lengths.

And you can come up with other schemes that are DC balanced, or constant 
power (so TvB's line voltage fluctuations problem with all the lights 
blinking together can be suppressed).

(which makes me wonder - wind farms have red warning beacons that blink 
at the same time.. it looks very odd at night from a plane, if that's 
all you see.. it's sort of like this spotted red curve that blinks on 
and off in the distance - but does the blink rate show up in the output 
of the wind farm? - I noticed it the first time flying into Burbank, 
where you come in to the north, over Lancaster/Palmdale area.. there's 
lots of wind turbines to the north by Tehachapi pass)





> Dana
> 
> 
> On Tue, Aug 14, 2018 at 4:00 PM, Attila Kinali <attila at kinali.ch> wrote:
> 
>> On Tue, 14 Aug 2018 20:52:50 +0200
>> "Bernd Neubig" <BNeubig at t-online.de> wrote:
>>
>>> Is there any common practice for the duty cycle of the 1 PPS pulse?
>>
>> As short as the consumer can take. Because a long pulse means that
>> you are wasting energy and heating up both the pulse generator
>> and the consumer. As TvB wrote, it varies from a few µs to a few ms.
>>
>>                          Attila Kinali
>> --
>> It is upon moral qualities that a society is ultimately founded. All
>> the prosperity and technological sophistication in the world is of no
>> use without that foundation.
>>                   -- Miss Matheson, The Diamond Age, Neal Stephenson
>>
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