[time-nuts] Phase modulation detection/NIST plan

[J. Forster]

I don't see why school crossing signs, water sprinklers, street or outdoor
lighting need 1 second timing. Ten minutes, or a photocell, would be more
than adequate.

Synchronized traffic lights, perhaps. But there are other cheaper, ways of
doing that like a simple radio link.

-John

===============


>
> die at dieconsulting.com said:
>> There are innumerable applications for low cost low power human level 1
>> second accurate time of day in modern electronic systems - examples are
>> traffic lights and school crossing signs and water sprinklers and street
>> lights and other outdoor lighting and many others... these systems are
>> not
>> normally network connected  and there is no current wide area technology
>> short of power hungry GPS with its weak signals and relatively high cost
>> and
>> difficult reception from many locations to do this.
>
> How many of those are really interested in low power?
>
> The only one I see on your list that might run off batteries is water
> sprinklers.  All the rest use enough power that a GPS unit would be in the
> noise.
>
> I think the main argument for WWVB receivers vs GPS receivers would be
> cost.
> In either case, you have to get the antenna outside the metal enclosure
> and
> that may be the major cost.  (I suppose a sprinkler controller could be
> mounted in a plastic enclosure.)
>
> "school crossing signs" is another possibility.  In the last year or two,
> I've seen several setups around here that have solar powered LEDs mounted
> at
> street level at pedestrian crossings.  They are great at night but not so
> great during the day.  (But during the day the pedestrians are easier to
> see.)
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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