[time-nuts] Inexpensive modular gps with 1pps

David davidwhess at gmail.com
Thu Nov 15 13:33:46 UTC 2012


On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux <jimlux at earthlink.net>
wrote:

>On 11/15/12 4:30 AM, David J Taylor wrote:
>> i just used this to with a raspberry pi with good success.
>>
>> https://www.adafruit.com/products/746
>>
>> james
>> ===============================================
>>
>> It looks idea, James, but ... with the 15 mm square patch antenna it
>> seems deaf compared to similar devices with 25 mm antennas.  Perhaps
>> understandable, but I just bought one and it's been sitting for well
>> over an hour and not yet acquired lock.  The device I bought from China,
>> sitting next to it, has been happily locked for that whole period.  (As
>> I'm running a test I don't want to unlock the other device).  Just a
>> caveat for someone considering using these devices indoors - size matters!
>>
>> 25 mm antenna device:
>>   http://www.satsignal.eu/ntp/NEO-6M-under-initial-test.jpg
>>   http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
>>
>> Cheers,
>> David
>
>
>ALl good ideas.. but I was looking more for something a bit more 
>packaged.. like a hockey puck with wires coming out.

I picked up a used Garmin GPS18-5Hz hockey puck to play with and after
updating the firmware, have gotten good results with the cable going
out a window and the unit sitting on the lower edge of the roof.  Its
5 pulse per second output has 60ns of resolution according to the
Racal Dana 1992 I repaired implying about a 16.6 MHz timing clock.



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