2 PPS 0130 UTC 29 Nov 2018

[Boriken]

Hearing ~ 2 pulses/sec on 6500/7000/7500/8000/8500/9000 kc. Strongest being 7500. Buddy across town is hearing it as well so not from inside the house.

[Boriken]

1700 UTC, at work (15 miles from home). Hearing them on 13000 & 14000 kc. Now in groups of 4. Last night, heard the 7000 & 8000 kc signal on the hfunderpants sdr.

[cwguy]

First saw these days ago on some US SDR receivers (via the SDR.HU website).  Found it odd/interesting, but only tonight thought I'd see what I can hear on the radio from my CO QTH.  Sure enough, I can hear 6.5. 7. 7.5 and 8 MHz 'ticks' locally near Denver.  Time now 0520Z, but have been hearing them all evening here.

[PresentedIn4D]

I've been tracking these recently. Have appeared nearly daily since at least Tuesday.

I've been able to hear it on:
5500 (night)
7500 (night)
8000 (night)
8500 (night)
9000 (day, night)
9500 (day, night)
10010 (day, night)
13500 (day)
14000 (day)
15010 (day)
18068 (day) - Just found this one, 2030z Dec 2nd
They are typically about S6 or so at my qth.
I was copying them somewhere around 2-4 Hz, then groups of 4 as of Wednesday (I believe).

Looking on SDRs, they were inaudible in Europe and Asia, and noticeably weaker in South America. I had tried to get someone with a beam to try to get a heading, but no cigar yet.

[Token]

I do not know when I first noticed this signal, it was a week or so ago.  I at first dismissed it as local noise, so I did not log it.  However it became apparent, when I found the signal on remotes as well as my local receiver, that it was not local.

Since then I have recorded it and looked at it a few times.

Frequencies seen local are:
5500 kHz
6000 kHz
6500 kHz
7000 kHz
7500 kHz
8000 kHz
8500 kHz
9000 kHz
9500 kHz
10010 khz
11000 kHz
12000 kHz
13000 kHz
14000 kHz
15010 kHz
16000 kHz

The signal looks to be on 24 hours a day, more or less, and what frequencies I can receive is probably determined by propagation.  Right this minute, 1030 local time, I can hear all freqs 7500 to 16000 kHz, but nothing below 7500 kHz.

Right now the pulses on each frequency are about 18.4 msec long and occur about every 479.6 msec.  However, I have measured slight variations from that, for example a few days ago it seemed to be more around a 476 msec repetition interval.

Unlike the mystery 1 PPS signal and the Pips Network signal, this does not appear to be tied to GPS or UTC time.

Pulse and interval images below:




The signal seems to be sequencing up in frequency.  I mean, it hits 5500, makes a pulse, moves to 6000, makes a pulse, moves to 6500, makes a pulse, etc.  The next pulse is made as soon as the previous pulse is complete.

Below is an image that shows this timing.  The upper trace is the signal on 16000 kHz, the lower trace is the signal on 15010 kHz.



This next image also shows the timing, but now the timing between 14000 kHz and 16000 kHz.  Lower trace is 14000 kHz, upper trace is 16000 kHz.  Since the 15010 kHz pulse occurs between these two frequencies you can see a gap one pulse width wide between the sampled freqs.



T!

[Exo]

Right now the pulses on each frequency are about 18.4 msec long and occur about every 479.6 msec.  However, I have measured slight variations from that, for example a few days ago it seemed to be more around a 476 msec repetition interval.

Good analysis of the signal, T.

Highlight of this report: UNID ditter 18068 kHz.

Report
2018NOV02 2110UTC

13000.00 kHz CW, UNID, ditter, weak, -116 dBm.
12000.00 kHz CW, UNID, ditter, weak, -114 dBm.
13500.00 kHz CW, UNID, ditter, weak, estimated -114 dBm, with CODAR interference. 
15000.00 kHz CW, UNID, ditter, weak readable, -110 dBm.
16000.00 kHz CW, UNID, ditter, good readable, -105 dBm.
18000.00 kHz CW, UNID, ditter, weak, -120 dBm. ?
18068.00 kHz CW, UNID, ditter, good readable, -105 dBm.

[Token]

Highlight of this report: UNID ditter 18068 kHz.

Report
2018NOV02 2110UTC

13000.00 kHz CW, UNID, ditter, weak, -116 dBm.
12000.00 kHz CW, UNID, ditter, weak, -114 dBm.
13500.00 kHz CW, UNID, ditter, weak, estimated -114 dBm, with CODAR interference. 
15000.00 kHz CW, UNID, ditter, weak readable, -110 dBm.
16000.00 kHz CW, UNID, ditter, good readable, -105 dBm.
18000.00 kHz CW, UNID, ditter, weak, -120 dBm.
18068.00 kHz CW, UNID, ditter, good readable, -105 dBm.

Interestingly, I did not see 18068 or 13500 earlier, yet both are there for me now.  Also, I recorded wide chunks of spectrum earlier, and 13000 and 14000 kHz were there and very strong, but nothing on 13500.  I would think that since I saw 13000 and 14000 I should have seen 13500 if it was on air.  So it is quite possible that neither 13500 or 16068 kHz were on the air earlier.

Also, I see 16500 kHz active right now, a frequency I had not seen before.

T!

[Exo]

Highlight of this report: UNID ditter 4500 kHz.

Report
2018NOV02 2350UTC

4500.00 kHz CW, UNID, ditter, weak, -112 dBm, interference from carrier and CODAR.
5500.00 kHz CW, UNID, ditter, weak readable, -115 dBm.

[Exo]

Highlight of this report: UNID frequency hopping ditter 3500 and 4000 kHz.

Report
2018NOV03 0100UTC

3500.00 kHz CW, UNID, ditter, good readable, -100 dBm.
4000.00 kHz CW, UNID, ditter, readable, -107 dBm.
4500.00 kHz CW, UNID, ditter, present but unreadable, -110 dBm, interference from carrier and CODAR.
5500.00 kHz CW, UNID, ditter, readable, -110 dBm.
6500.00 kHz CW, UNID, ditter, good readable, -100 dBm.

[Token]

5010 kHz also.

Sure, it is just a guess right now, it could be more than one source, or it might be more than one set of frequencies from the same source.

T!

So all frequencies so far reported:
3500
4000
4500
5010
5500
6000
6500
7000
7500
8000
8500
9000
9500
10010
11000
12000
13000
13500
14000
15010
16000
16500
18000
18068

[Exo]

5010 kHz also.

Yes, logged the low power frequency hopping ditter on 5010 now, with better signal strength. Checked earlier at 5010 kHz, but a carrier interfering signal masked it.


Report
2018DEC03 0112 UTC
5010.00 kHz CW, UNID, ditter, readable, -102 dBm, but with interference from a carrier.

2018DEC03 0350 UTC
3000.00 kHz CW, UNID, ditter, weak readable, -116 dBm, but with interference from a carrier.

[Traveling Wave]

0512 UTC - Hearing the 2PPS on 5010, 6500, 7000 and 8000 kHz in WNY. Not very strong but definitely picking it out of the noise.
0516 UTC - On 8000 kHz the signal fades in and out.
0521 UTC - 7000 kHz is the strongest followed by 6500 and 5010 kHz.

[Exo]

Low power frequency hopping ditter.

Highlight of this report: unusual sequence of 4 dits or pips, when logged around 2045UTC. 
Then at 2057UTC: returned to continuous dits as usual.
Some of the usual frequencies in between those logged were conspicuously missing, even though the adjacent frequencies were strong.
Good propagation today on the higher frequencies provided reception at 19500 kHz.

Report
2018DEC03 2045UTC

14000.00 kHz CW, UNID, ditter, 4 dits, 2pps, readable, with 9.7 Second repetition of the 4 dit group.
16000.00 kHz CW, UNID, ditter, 4 dits, 2pps, readable, with 9.7 Second repetition of the 4 dit group.
18068.00 kHz CW, UNID, ditter, 4 dits, 2pps, weak readable, with 9.7 Second repetition of the 4 dit group.
19500.00 kHz CW, UNID, ditter, 4 dits, 2pps, weak readable, with 9.7 Second repetition of the 4 dit group.

PLAY AUDIO: The 4 DITS flavor of the 14000 kHz UNID 2pps ditter CW 2018DEC03 2051UTC

Report
2018DEC03 2057UTC

14000.00 kHz CW, UNID, ditter, continuous dits, 2pps, readable
16000.00 kHz CW, UNID, ditter, continuous dits, 2pps, readable
18068.00 kHz CW, UNID, ditter, continuous dits, 2pps, weak readable
19500.00 kHz CW, UNID, ditter, continuous dits, 2pps, weak readable
 
Time domain image below shows the 4 DITS flavor of the 14000kHz UNID 2pps ditter CW logged on 2018DEC03 2051UTC, with measurement of the 9.7 second repetition for the 4 dit groups.

[ChrisSmolinski]

My early morning report circa 1105 UTC 4 Dec 2018:

3000 (this may not have been reported before?)
3500
4000
4500
5500
6500

Nothing higher noted, several of the lower frequencies were blocked by SWBC stations.


1230z:
5010? Difficult to tell as there was still a weak SWBC carrier
5500
6000
6500
7000


1443:
9500
11000
13500

[N0TZU]

Listening today Dec 4 at 1250Z from near Denver I can hear it on 2.000 MHz, 3.000, 3.5000, 4.000, 4.500, 5.010 and 5.500 (very faintly). Couldn't hear it at 2.510 as expected from the sequence and skipping WWV.

Has 2.000 been reported before?