[time-nuts] Bicentennial GOES satellite clock

[Bob kb8tq]

Hi

If GPS goes down, you then have Glonass. If Glonass goes down, you have Galileo. If all of those go down and you are in the
right region, the Chinese and Japanese both have systems you could use. 

In terms of *system* failure, there’s a lot of redundancy out there ….. Yes, you *would* have to own gear that works with all 
those systems. You might also go with multi-band (quad band maybe) gear to eliminate various other issues. 

Widely deployed electronic navigation isn’t all that old. People got along for a really long time without it ….. That includes a whole
bunch of folks who had no clue how a sextant works.  

Bob

> On Aug 12, 2018, at 10:29 AM, Scott McGrath <scmcgrath at gmail.com> 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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