[time-nuts] TAPR TICC (Cable run time delay)

John Ackermann N8UR jra at febo.com
Fri Oct 12 06:34:55 EDT 2018


If you're using traditional TIC mode (start on chA, stop on chB), the 10 
MHz line doesn't matter.  If you're in timestamping mode with chA or chB 
against 10 MHz, I'm still not sure the 10 MHz line makes any practical 
difference.

More generally and for most applications, line lengths aren't an issue 
as we're looking for changes in phase over time, not absolute phase.  So 
as long as the delays are stable, their magnitude doesn't matter much.

Also remember that there are a couple of nanoseconds of potential delay 
in the trigger circuits -- that's equal to a couple feet in free space.

John
----

On 10/11/2018 11:08 PM, Chris Burford wrote:
> Hello All,
> I've just received my new TAPR TICC and have been performing some
> initial dry runs against my PRS10.
> I have to ask about cable(s) delay and and what is essentially best
> practice for the TICC configuration. Is it commonplace to add both
> cables (10MHz source and 1PPS) or just the length of the 1PPS cable
> alone? I already have the cable delay specs from Times Microwave for
> the medium that I'm using.
> I would assume that the delay(s) in pico seconds are input to the TICC
> as the "Fudge" values? I'm just trying to get most of the bases
> covered here for a fair assessment of my RFS.
> Any and all comments are appreciated.
> Thanks,Chris
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