Martin:
Are you with PTS in Littleton ?
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y
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-----Original Message-----
From: time-nuts [mailto:[email protected]] On Behalf Of Martyn
Smith
Sent: Friday, June 29, 2018 9:13 AM
To: [email protected]
Subject: [time-nuts] 1 pps sync'ing
Hello,
My colleague Steve asked a question about wanting to generate a 10 MHz and
100 MHz squarewaves with both rising edges aligned to a reference 1 pps input
(to within 5ns).
We already have a product that can do this (at 10 MHz), but it is very
complicated, and Steve's job is to fine an easier approach.
I'm not trying to achieve 1-5 ns to UTC as that's not possible as already
pointed out, just 1 to 5 ns to a reference 1 pps (from Hydrogen Maser).
We definitely need all rising edges synchronised. Of course, we will have to
be very careful with cabling lengths etc otherwise we will lose all this
synchronisation.
So starting at 100 MHz and dividing down is a good idea, except the 100 MHz
needs to be synchronised in the first place, which brings me back to the first
problem.
Our existing product generates 48 bit BCD time code all synchronised to a 1 pps
inputs. This was designed ages ago for a customer. So, the last bit of the 48
bit is 100ns in time or 10 MHz in frequency.
So we could use this board and then lock the 100 MHz to the 10 MHz.
But it's not very elegant!!
Anyway, the research continues.
Best Regards
Martyn
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