[time-nuts] Optical Distribution of 1PPS and IRIG

Bob Camp kb8tq at n1k.org
Sun Jul 13 13:58:37 EDT 2014


Hi

Is $1K to much for the budget or is $200K?

Are you after microseconds, nanoseconds, or picoseconds?

Depending on what you are after, the range of “in the middle of the pack” moves around quite a bit.

Bob

On Jul 13, 2014, at 1:39 PM, Martin A Flynn <maflynn at theflynn.org> wrote:

> Hi Chris,
> Timing source is a SyncServer 200 with the rubidium option.    The inter-building fiber is already  budgeted as part of the IT and telecom portion of the project.   It adds no cost to the project to use it other then the optical transceivers.
> 
> That is where i need help - selecting the best product (in terms of cost/performance)
> 
> Martin
> 
> On 7/13/2014 1:07 PM, Chris Albertson wrote:
>> What accuracy requirements do you have.  This could be easy or impossible.
>> 
>> Don't spend to much money distributing 1PPS because you can have it
>> any place you want for the cost of a GPS receiver.  A second GPS
>> receiver is likely cheaper than the cost of 120 meters of cable plus
>> the cable drivers and receivers.  Even if you build the cable system
>> you'd need to test it which adds more time and cost.  GPS is so cheap
>> you can place them where needed.
>> 
>> On Sun, Jul 13, 2014 at 8:19 AM, Martin A Flynn <maflynn at theflynn.org> wrote:
>>> I am working on a project where I need to transfer 1PPS approximately 120
>>> meters between buildings.    I cam borrow a pair of 62.5 fibers from
>>> IT/telco to do so.
>>> 
>>> Playing cost / performance against one another, I am looking for a solution
>>> somewhere in the middle that does not requires SM-28 single mode fiber)
>>> 
>>> Martin
> 
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