[ntp:questions] shm + pps calibration

David Taylor david-taylor at blueyonder.co.uk.invalid
Sat Jul 7 18:36:52 UTC 2018

On 07/07/2018 18:10, William Unruh wrote:
> On 2018-07-07, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> On one PC I'm using an add-in PCIe card, a TTL-RS232 converter (tried
>> without but the signal levels were too low) and a Chinese module sitting
> That is really unusual. Most serial cards now will happily use TTL levels.
> The converter may (or may not) introduce delays to the pps signal. If they are
> sub usec it probably does not matter.
Yes, Bill, that surprised me as well!  Adding the level converter (a 
cheap Chinese board) solved the issue (no data seen on the serial port). 
  As this was for a Windows PC, a sub-microsecond delay didn't matter.

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