For some time there have been occasional reports of time pips on a
number HF frequencies other than the well known CHU, WWV, (etc...) signals.
For example 10140, 10145, 7040, 7065, 7105, 7120 kHz and likely others.
The pips are approximately 15 to 16ms in duration and appear to locked
to UTC but unlike WWV or CHU they are continuous minute by minute.
Assuming the pips are synchronized to UTC, simply time of arrival with
all of its issues on HF plus signal strength seems to indicated a source
in North America.
The frequencies and time of activity might indicate that it is some
amateur radio operator playing around but it might not be, the amateur
10MHz frequencies is shared with other users. The pips seem to be
transmitted at a fairly high power level.
I know there is ongoing testing of eLoran and other initiatives
researching GPS backup systems.
Anyone aware of any group doing any such testing which might be found on
HF like this?
cheers, Graham ve3gtc
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