[time-nuts] Why are 1PPS signals so skinny?

Bob Camp lists at rtty.us
Tue May 15 00:52:09 UTC 2012


If you want to avoid a crazy power supply, you decouple the power to the output amplifier on the PPS driver. Nice big caps, droop a little during the pulse. Charge up while there's no pulse.


On May 14, 2012, at 8:44 PM, Mike S wrote:

> On 5/14/2012 8:21 PM, Tom Van Baak wrote:
>> one day during an experiment where I was
>> comparing a large set of clocks I noticed my lab's digital AC power
>> meter was jumping by tens of watts every second.
>> The last thing you want
>> in a precision timing lab is to load your AC line down exactly once a
>> second.
> How does a short pulse help? It's still "tens of watts every second," but instead of lasting 0.5 seconds, it lasts 0.00005 seconds. Less power used overall, but still the same sudden change on the second.
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