[time-nuts] GPS Timing Source -- looking at buying
Bob Camp
lists at rtty.us
Mon Jul 12 12:15:49 UTC 2010
Hi
The original post simply mentioned EBU. Thus the confusion.
Bob
On Jul 11, 2010, at 8:23 AM, "Ed, k1ggi" <k1ggi at comcast.net> wrote:
> Keep in mind, SMPTE/EBU is timecode, AES/EBU is digital audio.
> 3 orders of magnitude difference in the bit rates.
> Chris was talking timecode.
> Ed
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Camp
> Sent: Friday, July 09, 2010 8:38 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] GPS Timing Source -- looking at buying
>
> 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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