Log for 電訊台

time.aws.com or time.cloudflare.com is okay

I need to setup my own time keeper

And if you use aws/ uk NTP, there will have latency

Ain't NTP already factoring latency

Do you have atomic clock

香港子午線, 其實 HKO 係以 Greenwich Observatory 建立

I dont have, but I will use GPS time

Setup a GPS time keeper with antenna, assigna own IP address.

ok

how do you prevent amplify attack?

I will not disclose my IP address to public

It just private use.

How HKO NTP prevent amplify attack ?

Any NTP clock suggested for Home use ?

"Zulu" time, more commonly known as "GMT" (Greenwich Mean Time) before 1972, is a time at the Zero Meridian. Currently, it's referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM).

So, say Zulu time is mean Greenwich Mean Time

https://en.wikipedia.org/wiki/Military_time_zone#:~:text=The%20military%20time%20zone%20system,and%20many%20nations%20in%20NATO.

I just tinker

Raspberry PI 4 sync NTP server.

wait a RTC module

How to get the time singal ?

想去

Just use chrony, no one use NTP now

You’re suppose getting it every sunrise at least

FYI
https://hackaday.com/2012/12/04/dcf77-signal-filtering-and-decoding/

RF time signal is good. In UK ok, but no RF in HK area