[time-nuts] Spectracom 8170 Time of Day grief...
paul swed
paulswedb at gmail.com
Thu Jun 13 21:52:35 UTC 2013
Could be. If those are the am detector type clocks they will work.
The ones I have do.
On Thu, Jun 13, 2013 at 5:26 PM, <EWKehren at aol.com> wrote:
> I have four 15 year old Junghans Mega clocks through out the house. Ten
> days ago I noticed one of them dead. Battery, and by the look of the
> battery
> dead at least a month. I inserted a new battery and it did set. I did not
> watch it but today I went with one of them through the house and all are
> exact within a second. Even advance the second as close as I am able to
> observe. I am confident they synch daily.
> Bert Kehren
>
>
> In a message dated 6/13/2013 2:08:32 P.M. Eastern Daylight Time,
> paulswedb at gmail.com writes:
>
> Burt what you mention was indeed correct. But that non psk time was
> stopped
> about a month ago.
> Its pure PSK now as far as I know
>
>
> On Thu, Jun 13, 2013 at 1:08 PM, Burt I. Weiner <biwa at att.net> wrote:
>
> > Paul,
> >
> > Thanks for the information. Late last night I did a search and found out
> > about the "d-pskr-r" - an appropriate name, indeed. I gather there is no
> > final design that says, "Here, build this and it'll work". I have a
> malady
> > that I suspect is common in this group; I hate to throw anything away
> or
> > convert it to a door stop.
> >
> > Supposedly, WWVB reverts back to the non-psk mode twice a day, at 12:00
> > Noon and again at 12:00 Midnight, each time for 30 minutes. Last night
> my
> > 8170 did not set. At my location the signal has been the most stable
> during
> > the day, so I'm going to watch it today at noon. I'll report my useless
> > findings afterwards. If it were to set once every 24 hours I would
> probably
> > be happy as I'm not using it to time a network, just to hopefully be a
> > little more accurate than my 30 year old kitchen clock.
> >
> > By the way... Earlier I mentioned that I have two 9150-52054 GPS units.
> > Apparently my mind and fingers were not speaking to each other at that
> > moment as I have should've typed, (DATUM) 9390-52054. Both of these run
> > 24/7, use separate antennas and are on a UPS. I'm sure you've seen my
> > various epistles in this group about them. Since I've changed out their
> > power supplies and upgraded their crystal oscillators, they're most
> happy.
> >
> > Burt, K6OQK
> > www.biwa.cc
> >
> >
> >
> > Burt search time nuts its all there. Its not a kit by any means.
> >> Spectracom did a very good job. To good, though in reality they simply
> >> reused the phase tracking rcvr from other units. Essentially the system
> >> locks to the stable carrier creating a local replica and then removes
> the
> >> carrier recovering just the AM. Or think of it as subtracting the
> carrier
> >> leaving just the data. Very good design very bad for PSK, since the
> >> carrier
> >> no longer has a relationship.
> >> Nist and spectracom did put notices and such out for over a year, so
> what
> >> can you say. Though we all have lots of strong opinions actually. Don't
> >> want
> >> to start that thread again.
> >> I have often thought and will spend no time doing it. Simply replace
> the
> >> demod with a diode detector. Now its not actually quite that easy. But
> if
> >> the only thing I had was a 8170 what the heck. The schematics of the
> >> system
> >> are available at spectracom.
> >>
> >> Near as I can tell the 8170 would run about 2 days on a fix.
> >>
> >> Off to seriously sleazzy land. You could always bugger a gps clock into
> >> the
> >> system adapting GPS time to local time by a micro. But that really is
> >> ugly.
> >> Though you end up with those nice clock digits working again. Hey when
> you
> >> do that send me the old rcvr parts. ;-)
> >>
> >> Regards
> >> Paul.
> >>
> >>
> >> On Thu, Jun 13, 2013 at 12:37 AM, Burt I. Weiner <biwa at att.net> wrote:
> >>
> >> > Paul,
> >> >
> >> > Ummmm... What a revolting development this is. My 9150-52054 have a
> >> > smaller readout out that I can't see without climbing up on my bench,
> >> > so I suppose I will no longer know what time it is.
> >>
> >
> > Burt I. Weiner Associates
> > Broadcast Technical Services
> > Glendale, California U.S.A.
> > biwa at att.net
> > www.biwa.cc
> > K6OQK
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