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 <[email protected]>
wrote:
Used to work with Wayne on two time transfer via satellite
Great guy
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
[email protected]
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:[email protected]] 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" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
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
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
--
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
