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From: clements@BBN.COM
Newsgroups: comp.protocols.time.ntp
Subject: Re: (new) things implemented at WWV/H?
Message-ID: <9103071939.AA02243@trantor.umd.edu>
Date: 7 Mar 91 19:35:49 GMT
References: <1991Mar03.171659.6992@hoss.unl.edu>
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In article <1991Mar03.171659.6992@hoss.unl.edu>
mosemann@sardion.unl.edu (Russell Mosemann) writes:
>
>   I got a copy of radio.txt from louie.udel.edu which contained a
>section on WWV/H graciously retyped by Bob Clements, K1BC,
>clements@bbn.com (thanks, Bob).

You're quite welcome.

>In section 2.5.6 it talks about the BCD
>data that is transmitted each minute.  Several of the pieces are marked
>as new, and I was wondering if they have been implemented yet.

Not as far as we know.  I asked the engineer how it was coming,
in a phone call near the end of December, and was told that a
contract was issued.  He said they hoped to have a unit to
evaluate "in a few months".  I haven't followed up since then.

>For example,
>there is the Daylight Saving Time indicator #2, a leap second warning, and
>values for the current year.
>   A UT 1 correction can be .1, but is that .1 seconds or .1
>microseconds (or milliseconds, even)?

That's tenths of a second.  The UT1 versus UTC value is the
difference between the Earth's rotation and the atomic clock
time.  Typically, every year to 12 months that difference has
added up to a large enough value to require a leap second to be
inserted.  The number included in the code tells you how many
tenths of a second have accumulated so far.  Precise astronomical
navigation needs about that much accuracy, which is why it is
always transmitted.  The same value is represented by the "double
ticks" you hear early each minute on the audible time ticks.

>   Lastly, I would like to hear from anyone who has used or is using the
>Most Accurate Clock from Heathkit and how you like/dislike it,
>features/bugs, and anything else you would like to share.  Thanks.

I have a couple of these but won't add much to Dave's comments.
He's right.  They're OK for around the house, but not
professional quality.  Also, they forget everything with the
briefest power interruption.

>--
>Russell Mosemann                  Internet:      mosemann@crcvms.unl.edu
>Network Analyst                   Bitnet:               mosemann@unlvax1
>Computing Resource Center         UUCP:   ..!uunet!hoss.unl.edu!mosemann
>University of Nebraska - Lincoln  Voice:  (402) 472-5930   Fax: 472-5280


Bob Clements, K1BC, clements@bbn.com