Re: [chrony-users] Time synchronisation over a high-latency packet radio network

[Stuart Longland <stuartl@xxxxxxxxxxxxxxxxxx>]

On 8/5/19 10:35 am, Bill Unruh wrote:
>> Doable, and I've made future provision for it, but as stated, I'm trying
>> to keep costs down.  If more hardware is the answer, my first stop will
>> be for a battery-powered RTC rather than a GPS.
> 
> really cheap rtc will have trouble keeping 1 sec accuracy for any length of
> time, especially if your device is subject to temperature variations (
> which
> it would seem yours will).

Probably, the real advantage with having an RTC is that while it might
drift by a few minutes whilst in storage… it's much better than the
"stock RTC" in the PocketBeagle, which at present is about 3 years out.

These will be brought out of storage, programmed with a call-sign and a
location, used over 3 or 4 days, then put away again for a few months
until the next such event comes along.

This weekend just gone was the first time we used this system, the next
time where we'll likely use it will be in July.  It really just needs to
be able to hold the time for a day whilst un-powered so that `chronyd`
has a small offset to adjust, not a huge one.

Regards,
-- 
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...
  ...it's backed up on a tape somewhere.

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