[time-nuts] USB Low Cost GPS Timing Receiver

[Bob Camp]

Hi

Put another way:

If you set up / sync up a time source based on a cheap 1 ppm TCXO, you are good for more than 10,000 seconds after the sync. If your viewing period is in the 2 to 4 hour range, it should work out pretty well. 

Bob
  
On Nov 26, 2010, at 7:58 PM, Brooke Clarke wrote:

> 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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