[time-nuts] Bicentennial GOES satellite clock
paulswedb at gmail.com
Fri Aug 10 11:25:37 EDT 2018
yes I still have a modified 468 that works using some stuff I design back
in 2005. I do power the dc468 up every now and then.
Still works. Though a couple of the panaplex displays are getting a bit
cranky. But completely agree that GPS has seriously spoiled me as it drives
time code clocks.
On Fri, Aug 10, 2018 at 10:18 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
> Thanks for posting that photo. That space age 1976 GOES clock caught our
> eyes when the paper came out in 2005 (see also pages 11, 12, 13):
> There was quite a bit of traffic on time-nuts around 2005 when the GOES
> satellite time service was turned off (and back on, and off, and on, and
> finally off for good). That left many of us with piles of 468 MHz GOES
> receivers, antennae, clocks and led to efforts to re-create the RF signals
> in-home so that GOES clocks would still work. There was even a commercial
> G2G (GPS to GOES) translator.
> Anyway, I asked around about that one-off bicentennial clock in the photo
> and neither the authors, NIST, or Smithsonian knows where it ended up.
> There's tons of information on the GOES satellite system and GOES clocks in
> the NIST T&F archives:
> Best to search title for GOES, or search author for Hanson. It's a
> fascinating glimpse into the recent past. Yes, it's sad that GOES (and
> Omega, and Loran-C) aren't operational anymore, but GPS does such a better
> job. Plus we now have cable, WiFi, cell phones, the internet, Iridium, etc.
> If you wanted to build your own Bicentennial GOES Clock, the design was
> published, including source code -- for its i4004 (!!) CPU. If you have
> even one minute to spare, see attached image and click on these two PDF's:
> "Satellite Controlled Digital Clock System (patent)"
> "A Satellite-Controlled Digital Clock (NBS TN-681)"
> ----- Original Message -----
> From: "Tim Shoppa" <tshoppa at gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts at lists.febo.com>
> Sent: Wednesday, August 08, 2018 7:29 PM
> Subject: [time-nuts] Bicentennial GOES satellite clock
> > See the groovy picture at
> > https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4847573/
> > If anyone knows the whereabouts or history of the bicentennial GOES time
> > clock display, please let me know!
> > Tim N3QE
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