[time-nuts] GPS Timing Source -- looking at buying

[Bob Camp]

Hi

The Thunderbolt has a GPS and an OCXO inside it. It's built in smarts align a PPS created from the OCXO to the GPS PPS. This allows the PPS to be more stable than a normal GPS PPS (less jitter). It also provides holdover on the PPS if and when GPS sat's are not available. 

Since your ultimate objective is (I think) AES / EBU timing, jitter is an important consideration.

Bob


On Jul 9, 2010, at 3:10 AM, Chris H wrote:

> I might go for the Garmin one to start with, and see how it all works..
> and then move up to a more reliable source of timing source in the
> future...
> 
> When you say Reliable, what exactly do you all mean---
> does it loose time? 
> Does it loose lock to the satellites?
> because it's only millisecond accurate, is that your concerns....
> 
> Please correct me if I am wrong: 
> 
> If it's pulsing every second, and that second is generated by the lock
> to the satellite, then should it not be as accurate as the device that
> it's getting it's lock from?
> 
> (Sorry I am new to all this)
> 
> 
> On Fri, 2010-07-09 at 19:02 +1200, Chris H wrote:
>> Yes sorry -- stratum 1 -- brain fart :(
>> 
>> 
>> 
>> On Fri, 2010-07-09 at 06:32 +0000, Paul Nicholson wrote:
>>> Chris H wrote:
>>>> Would be good as a timing source for GPS
>>>> ... make a PC into a Stratum 0 timing device?
>>> 
>>> I think it would count as stratum 1, since you are 1 hop
>>> away from a master time source.
>>> 
>>> This page may be of interest,
>>> 
>>>  http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
>>> 
>>> Trimble Thunderbolts have been recommended on this list as a
>>> proper timing grade GPS, superior to these EOM Garmin GPS units.
>>> 
>>> There's a reliable source of Thunderbolts on E-bay.  I currently
>>> have one of these on order,
>>> 
>>>  http://cgi.ebay.co.uk/290322053618
>>> --
>>> Paul Nicholson
>>> --
>>> 
>>> 
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>> 
>> 
>> 
>> 
>> 
>> 
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> 
> 
> 
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