[time-nuts] New WWVB modulation format receivers (NOT)
paulswedb at gmail.com
Fri Feb 21 11:55:18 EST 2014
Boy do I need to agree with Chris's comments above. If this is anything
serious GPS really is the answer in all respects. Yes there is the risk of
something happening. But amazingly a lot of the GPS receivers hold onto
time pretty well even without GPS.
The whole WWVB thing makes sense as a frequency transfer method. But is not
at all close to GPS today. Its far more interesting to watch the VLF
propagation behaviors and as a sort of backup frequency reference. LORAN C
simply kicked butt with what it delivered and was on par with and frankly
better then GPS for frequency. At least for me over 20 years of practice.
But one day soon eLORAN may just come back its looking positive.
Sorry not to change the subject.
On Fri, Feb 21, 2014 at 11:46 AM, Chris Albertson <albertson.chris at gmail.com
> If you are looking for an accurate, easy to use timing signal then GPS
> is the one you want. WWV and WWVB are what I call "legacy" signals
> and while they might be accurate when broadcast there is propagation
> delay and unknown atmospheric and ionospheric conditions.
> But the question is "How accurate do you need?" If a few tens of
> milliseconds is good enough then running NTP over the internet will
> work and if you already have an internet connection it's free. If you
> need a few nanoseconds then GPS is what you want.
> Using your beat with WWV as a benchmark. You were getting about one
> part in a million accuracy. It is VERY easy to do 10,000 times better
> than that with GPS.
> On Thu, Feb 20, 2014 at 8:19 PM, Bob Albert <bob91343 at yahoo.com> wrote:
> > I would love to discipline my counter and signal generator time bases to
> match NIST. Is this possible, and what would I need to do?
> > I am sure this subject has been covered but I don't know how to find it.
> Chris Albertson
> Redondo Beach, California
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