[time-nuts] Inexpensive modular gps with 1pps

Sanjeev Gupta ghane0 at gmail.com
Mon Jan 7 08:00:17 UTC 2013


David, Hal,

Thank you very much for the pointers, and the hand-holding.

I ordered a unit from Sure last month, which arrived last week.  I used
David's excellent instructions, and I am happy to report that the unit
(cabled to a 1U Linux server, Debian testing) is working well (or so I
think).

ntpq -pn :
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
+127.127.28.0    .GPS.            0 l   13   16  377    0.000  -19.214
12.250
*127.127.28.1    .PPS.            0 l   12   16  377    0.000    0.001
0.001
-203.123.48.6    223.255.185.2    2 u    6   64  377    0.107    9.251
0.016
-203.123.48.218  223.255.185.2    2 u   23   64  377    0.160   -6.036
0.045
-118.143.17.82   .MRS.            1 u   29   64  377   88.536   24.006
0.745
#54.251.61.122   158.108.212.149  3 u   18   64  377    7.372   -0.099
1.773
x203.129.68.14   192.168.51.203   2 u   43   64  365  210.371   84.157
0.289
x123.108.109.9   118.143.17.82    2 u   26   64  377  116.259   39.154
0.509
#202.131.74.126  210.0.235.14     3 u   26   64  377   42.854   -1.611
0.610
-192.53.103.104  .PTB.            1 u   53   64  377  353.550    1.066
24.731
-131.188.3.222   .PPS.            1 u    6   64  377  361.439   -7.954
0.625
+133.100.11.8    .GPS.            1 u   10   64  377  105.521   -7.343
1.407
-121.182.147.191 .GPS.            1 u   55   64  377  128.177    3.004
12.558
-2001:df0:232:ee .NICT.           1 u   14   64  377   91.402    0.443
2.651

This server (and others syncing with it) are members of the
sg.pool.ntp.org, and hence hopefully helping others.

The gpsd output is visible here:
      http://bit.ly/VwfkAt

To the Time-Nuts in general, thanks a ton.

To David in particular, your instructions are very, very, clear.

My colleague, who soldered the two wires for me, now wants a clock to
display the time in the server room.  I shall show him photos of Nixie
clocks :-)

-- 
Sanjeev Gupta
+65 98551208     http://www.linkedin.com/in/ghane


On Sat, Dec 15, 2012 at 3:15 PM, David J Taylor <
david-taylor at blueyonder.co.uk> wrote:

> Thank you, nice summary.
>
> One of my problems is that I am in Singapore.  Soldering is not an issue in
> itself, but I cannot just order transistors and other small components
> online.
>
> You mention "low cost units which require you to add a power connector,
> etc".  Could you recommend any that can be bought online?  With RS-232,
> please?
>
> Sanjeev Gupta
> ==============================**===========
>
> Sanjeev,
>
> It sounds as if this unit may suit:
>
>  http://www.satsignal.eu/ntp/**Sure-GPS.htm<http://www.satsignal.eu/ntp/Sure-GPS.htm>
>
> It has RS-232 (true levels, not CMOS) and requires only two wires to be
> soldered.  Order from:
>
>  http://www.sureelectronics.**net/goods.php?id=99<http://www.sureelectronics.net/goods.php?id=99>
>
>
> Cheers,
> David
> --
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
>
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