[time-nuts] 60 KHz Receiver
Heathkid
heathkid at heathkid.com
Tue Oct 5 05:26:11 UTC 2010
One more note before I just "read the posts for a while"...
> a) broadcasts aren't legal for US hams
Do some reading on telemetry and when broadcasts ARE allowed. I've been a
Ham for more than 30+ years.
> b) ionospheric uncertainty in the skywave path makes this no better than
> WWV
No kidding... but without GPS (and assuming no Internet as well) how do we
sync our clocks besides RF?
> c) Whats wrong with GPS and/or WWV and/or CHU or whatever?
Nothing as long as they are TRANSMITTING.
> d) A cheap Rb would give you a local reference that is much better than
> what you could do with receiving something via skywave.
I have three Rb standards to go along with my two Thunderbolts.
> If you want something that isn't run by governments,and is a technical
> challenge, how about pulsars? I'd guess (not having looked into it at
> all) that is would be cheaper to set up a station to receive pulsars than
> to run a Cs standard.
Are you serious? Cheaper? Really? I'll trade you a Thunderbolt...
complete kit! for a full Pulsar time/frequency reference receiving station
that is reliable (and the real-estate plus equipment for a dish large enough
for it!). ;)
> While I fully sympathize with the "stand alone" approach (that's one of
> the appeals of HF comms in general.. you aren't depending on anyone else's
> infrastructure), I don't know that setting up a time standards station
> fits in with that..
I have *many* mechanical watches. I can easily calculate NOON from the sun
at anytime during the year. That's a reference and I can "set my watch by
it". I don't need you or anyone else to tell me what time it is. If my
watch isn't accurate or precise or is off my 1mS/day (or hour)... does it
*really* matter if the GPS sats are down (think about it... why would they
be down)?
What time is it?
*that wasn't my point* ---- it's "relative" and I'm not going to go further
with this discussion. I just thought a "time-nuts based time system" was an
interesting prospect.
...done.
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