[time-nuts] USB Low Cost GPS Timing Receiver

J. Forster jfor at quik.com
Sat Nov 27 01:15:42 UTC 2010


Some of the older GPSs had the 9 pin COM port connectors to interface with
the mapping SW running on a PC laptop (Magellen or Garmin ?). Might that
data stream contain good enough timing info? I don't knoe what protrocol
they used.

-John

===============


> Hi Bill:
>
> The telescope has around arc second pointing capability so I think he
> needs a hundredth of a second or slightly better.
>
> What's now done is to manually bring the scope onto a half dozen known
> stars (called a short run) which sets time in the tracking software.
> But if the tracking computer had much better time the short run would no
> be needed.
>
> I've found some NMEA software that will set a PC clock, but it expects
> the data on a COM port.  Don't know how it might work with USB data.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
> Bill Hawkins wrote:
>> Brooke,
>>
>> Google says the SD-200 speaks 4800 baud NMEA at 1 second intervals.
>>
>> It is not clear whether the message is fixed of if it will reply
>> to queries.
>>
>> Your question only concerned cost. Is one second accuracy adequate?
>>
>> Bill Hawkins
>>
>>
>> -----Original Message-----
>> From: brooke at pacific.net
>> Sent: Friday, November 26, 2010 3:43 PM
>> To: time-nuts at febo.com
>> Subject: [time-nuts] USB Low Cost GPS Timing Receiver
>>
>> Hi:
>>
>> A friend is looking for a low cost GPS receiver to set the clock in the
>> computer that controls his telescope mount.  USB would be nice but is
>> not
>> a requirement.
>>
>> For example does eBay item 130456356506 set the computer clock?
>>
>> This GPS receiver for the Nikon has a mini-USB connector, but when
>> connected to my computer is not recognized.
>> http://www.prc68.com/I/Nikon.shtml#GPS
>>
>> Have Fun,
>>
>> Brooke Clarke
>>
>>
>>
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>
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