[time-nuts] Bicentennial GOES satellite clock

djl djl at montana.com
Sun Aug 12 19:06:55 UTC 2018


all you need for a once a day noon fix is a level surface, a stick, and 
some pebbles.
Don

On 2018-08-12 08:29, Scott McGrath wrote:
> And with dependence on GPS we have created a serious vulnerability as
> too many critical pieces of infrastructure are dependent on a SINGLE
> precision timing and positioning system.
> 
> I can use a sextant and have a copy of Bowditch.    But they only work
> on clear days and nights.
> 
> if GPS goes down for any reason.   Whats the backup solution?
> 
> 
> On Aug 10, 2018, at 2:25 PM, Lester Veenstra <m0ycm at veenstras.com> 
> wrote:
> 
> Used to work with Wayne on two time transfer via satellite
> Great guy
> 
> 
> Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y
> lester at veenstras.com
> 
> Physical and US Postal Addresses
> 5 Shrine Club Drive (Physical)
> HC84 452 Stable Ln (RFD USPS Mail)
> Keyser WV 26726
> GPS: 39.336826 N  78.982287 W (Google)
> GPS: 39.33682 N  78.9823741 W (GPSDO)
> 
> 
> Telephones:
> Home:                     +1-304-289-6057
> US cell                    +1-304-790-9192
> Jamaica cell:           +1-876-456-8898
> 
> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of 
> Tom
> Van Baak
> Sent: Friday, August 10, 2018 10:19 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Bicentennial GOES satellite clock
> 
> Tim,
> 
> 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):
> 
> https://tf.nist.gov/general/pdf/2013.pdf
> 
> 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:
> 
> https://tf.nist.gov/general/publications.htm
> 
> 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)"
> https://tf.nist.gov/general/pdf/1791.pdf
> 
> "A Satellite-Controlled Digital Clock (NBS TN-681)"
> https://tf.nist.gov/general/pdf/452.pdf
> 
> /tvb
> 
> 
> ----- 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/figure/f9-j110-2lom/
>> 
>> If anyone knows the whereabouts or history of the bicentennial GOES 
>> time
>> clock display, please let me know!
>> 
>> Tim N3QE
> 
> 
> 
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-- 
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304





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