[ntp:questions] Onboard Local Oscillator Change Improvements
John Ackermann N8UR
jra at febo.com
Tue Oct 9 14:11:51 UTC 2007
Eric.Jones wrote:
> Alternatively to Harlan's suggestions, there are a few DIY alternatives
> also if you are so inclined...
>
> TAPR has a nice clock-generator kit with an ICS525 chip that can use an
> external GPS signal rather than a crystal:
> http://www.tapr.org/kits_clock-block.html
Thanks for the plug (I'm the ClockBlock designer) but this isn't
accurate. The Clock-Block requires an input clock signal in the HF
range and won't work with a PPS signal.
However, a TAPR Reflock II (http://www.tapr.org/kits_reflock_ii.html)
could sort of do this -- it can steer an oscillator to GPS via PPS
signals, and that oscillator need not be at something simple like 10
MHz; it could operate directly at the motherboard's clock frequency. So
you would still need to provide a piece of decent-quality quartz in the
solution.
John
More information about the questions
mailing list