Time-like pulse, ~12100

[incertae_sedis]

Over the past week, I've been hearing both a one and two frequency pulse across multiple frequencies.  The stations appears at 12095 and is audible in CW up through 12200.  The signal content is a pulse, mostly on one frequency, but occasionally "drifts" out of phase and becomes two pulses, closely spaced in time and slightly offset in frequency (~100 Hz).  I haven't checked how often the signal is present during other times, but it has been there between 0400--0630 UTC since 28 May.  Possibly unrelated, there is an RTTY broadcast often present at 12121 as well.

Cheers,
Incertae Sedis
Washington State

[cmradio]

IIRC, Chris did some research into these.... they're found all across the band. Purpose?

Peace!

[incertae_sedis]

Currently audible again near 12100 kHz (0334 8 Jun.).  I've made a recording of the pulses.  If anyone is interested, I can send some clips along.

cmradio, do you mean this type of signal is audible for others across the entire 25m band, or just in the 12100--12200 kHz range?

Incertae Sedis
Washington State

[cmradio]

My error, I was thinking of Token's post here:
http://www.hfunderground.com/board/index.php/topic,6904.0.html

Peace!