Lynwood,
I don't consider it a problem that ARDC would not provide NTP services.
NTP is such an easily run service... we have too many NTP servers inside our 44.137/16
network to even mention them here. Every Linux host in the network runs either ntpd
or chrony to synchronize its own time, and allows queries from within net44.
So no problem at all to get synchronized using a couple of nearby servers.
As we run co-channel repeaters on the network, many of those NTP servers are stratum 1.
(synchronized by PPS from a GPSDO). I also have a LeoNTP at 44.137.41.102
At address 44.137.0.1 (internet address 145.220.78.2 or 2001:67c:6ec:6861:145:220:78:2)
we have an NTP server with about 20 sources, which is also used for monitoring.
And of course on the internet there is pool.ntp.org.
Rob