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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