multiple PPS sources

[Folkert van Heusden]

> > To my surprise, two are ignored (not sure which!):
> Is there anything in the log file?

Oh of course!

Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: line 34 column 9 syntax error
Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: syntax error in /etc/ntpsec/ntp.conf line 34, column 9
Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: line 35 column 9 syntax error
Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: syntax error in /etc/ntpsec/ntp.conf line 35, column 9
Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: line 36 column 9 syntax error
Dec 06 08:50:49 euro-pi ntpd[83556]: CONFIG: syntax error in /etc/ntpsec/ntp.conf line 36, column 9

It should've been:
	refclock pps unit 0 refid PPS0
instead of /dev/pps0.

> You can easily figure out which one by changing the refids to PPS1 and PPS2

Indeed:

     remote           refid      st t when poll reach   delay   offset   jitter
===============================================================================
oPPS(0)          .PPS0.           0 l   39   64    3   0.0000   0.0417   0.0203
xPPS(1)          .PPS1.           0 l   38   64    3   0.0000 -41.3660   0.0199
xPPS(2)          .PPS2.           0 l   37   64    3   0.0000 -192.879   0.9785