Hi, 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.
http://www.g6nhu.co.uk/frequencies.html http://www.rttycontesting.com/rtty/rtty-sub-bands/ Cheers, Magnus 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 > > _______________________________________________ > time-nuts mailing list -- email@example.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.