[time-nuts] New WWVB modulation format receivers (NOT)

paul swed paulswedb at gmail.com
Fri Feb 21 13:04:40 EST 2014


Bob
Yes they will. But there is a danger here when you say very precise. On
Time-Nuts those are very particular words that can carry a very long email
thread.
You say that the complete solutions are a bit out of range.
Today there are lots of solutions if you want use a soldering iron.
Each has the trade off of cost effort and accuracy. But say you needed
something for amateur radio purposes pretty much any of the solutions are
very good.
Regards
Paul.


On Fri, Feb 21, 2014 at 12:47 PM, Bob Albert <bob91343 at yahoo.com> wrote:

> I looked on line and it seems that these receivers are available for about
> $150 and up.  A little out of my price range right now but I'll keep my
> eyes open.
>
>
> I presume that with a reasonable antenna this unit will give me a very
> precise 10 MHz which I can use to synchronize my counter.  I am not sure if
> my counter will accept that frequency but it shouldn't be a big deal to
> convert to something it will accept, or use its OCXO as a transfer standard.
>
> Bob
>
>
>
>
> On Friday, February 21, 2014 8:57 AM, paul swed <paulswedb at gmail.com>
> wrote:
>
> 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.
> Regards
> Paul.
>
>
>
> On Fri, Feb 21, 2014 at 11:46 AM, Chris Albertson <
> albertson.chris at gmail.com
> > wrote:
>
> > Bob,
> >
> > 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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