Andy:

Thanks for doing those checks. I deliberately didn't give my own
measurement result, to make sure we didn't influence each other's
interpretation, but your 18msec early agrees well with my estimate of
17msec. early. I did it by listening in the upper sideband. That gives me
similar clicks from both the GPS and the MSF keying edges. I measure the
time delay with a software scope since I no longer have a working real
scope - I would need ANOTHER scope in order to repair it!

This result surprised me because I am sure it has always been right before.
My first thought was that there was something wrong with my GPS (a Trimble
Palisade which I think you know), but I checked the timing from LORAN
(transmitted from the same site as MSF) and that showed the correct time
delay for the distance. You seem to get DCF77 exactly at the PPS pulse, and
so do I now. I seem to remember it was 4msec. late which is roughly what I
would expect. Maybe DCF77 is early by a few msec too.

I wonder why MSF is early? The Chinese time signal BPM on HF is always
early too but I can't remember the exact figure. Perhaps they are all
compensating for the delay through a particular receiver.

I am currently logging the phase of MSF against GPS to see how stable that
is, especially at night, although it should be pretty good here since it's
only 70km away.

73
Peter G3PLX

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Posted by: "Peter Martinez" <[email protected]>

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