On 15/08/2013 08:34, Rob wrote:
David Taylor <[email protected]> wrote:
On 14/08/2013 17:44, Rob wrote:
[]
How does a "good" receiver know the correct time? Does it rely on
local (backed-up) storage, or is there some way of receiving it via
the almanac? Or are "good" receivers hardwired as well, only with
a different valid span?
I would not be surprised when "good" receivers turn out to have just
a different moment or mode of failure.
[]
Some receivers have battery backup, in fact all but one of the receiver
types I use have this.
Ok but what happens when the battery is replaced?
[]
Hope and pray? Wish for a large capacitor or flash-rom?
I had thought that either ephemeris or almanac data might contain the
real UTC time, but apparently it does not. Obviously a system designed
too far in advance of the Year2000 fuss and bother!
--
Cheers,
David
Web: http://www.satsignal.eu
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