[time-nuts] unidentified HF time pips

Magnus Danielson magnus at rubidium.dyndns.org
Sun Feb 4 18:03:27 EST 2018


You should look at WSPR, QRSS, RTTY, JT65, JT8 etc which all belong to a
set of amateur digital modes which show up on those frequencies.



On 02/04/2018 11:31 PM, Graham wrote:
> 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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