Re:I tried to adjust the time on my alarm clock
by Gibbon1 on Monday November 04, 2019 @07:34PM
(#21448402)
Better is just use GPS. You can passively listen without being tracked and you get the time and location. GPS is getting cheap enough ($10/1000 qty) to be a good option for this sort of thing.
Re:I tried to adjust the time on my alarm clock
by Spivak on Monday November 04, 2019 @10:05PM
(#21449230)
Doesn’t work super well when your clock needs an unobstructed view of the sky. How many clocks in your house have that?
Re:I tried to adjust the time on my alarm clock
by shaftway on Tuesday November 05, 2019 @02:08AM
(#21450331)
It's not like it needs a solid fix though. It just needs a single satellite signal to get through, which is way more reasonable.
Re:I tried to adjust the time on my alarm clock
by Gibbon1 on Tuesday November 05, 2019 @02:22AM
(#21450378)
I have a higher end GPS module. Building I'm in is corrugated steel sided with a metal roof. After being on for an hour the coordinates show... my desk. Far as I can tell.
GPS transmit power is 44db with a 13 db antenna gain. I think. And -140 db sensitivity (typical) So close to 200db of link margin. And the transmitter isn't in clutter either.
Re:I tried to adjust the time on my alarm clock
by codedokode on Monday November 04, 2019 @07:18PM
(#21448276)
Don't mobile networks broadcast the time already?
It'd be cool if WiFi routers could broadcast the time unencrypted, for use by passive receivers, but that would get annoying if one near you is set wrong. Perhaps there could be a trusted source of signed timestamps, and a receiver just takes the maximum.