Loggings > HF Mystery Signals

UNID 5100-5140, 320z Strange data transmission

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RadRoadrunner:
First noticed at 300z, seems to be a 40khz wide data transmission made up of quickly sweeping lines on SDR.

MDK2:
It's most likely possibly Over The Horizon Radar (OTHR) centered at 5120. It should start up again at 0340.

Token:
This signal has been up and cycling since before 0200z this evening, and was up also last night.

Tonights cycle is 5 minutes off air, 5 minutes of dead carrier, 5 minutes off air, 5 minutes of LFMCW waveform, repeat cycle starting with 5 minutes of dead air.  Last night it used both this cycle and a 10 minute on/off cycle.

While it is currently on 5120 kHz center freq, earlier tonight it was on 5100 kHz center freq.  The LFMCW waveform has been anything from 25 to 60 kHz wide, picking one width during any given 5 minute active cycle.  Sweep rates from 1 Hz to 40 Hz have been seen, like width only one sweep rate per transmission cycle, mostly 25 Hz and 1 Hz.

This could be an OTHR, the LFMCW waveform is a common one for them.  However the CW mode is not something an OTHR would use for much.  If HAARP was still active I would say that would be a good candidate for the source, but last I heard the transmitters would not be ready to come back online for several months.  Maybe they are testing them early?

The carrier has 60 Hz hum on it, showing clear 120 Hz, 240 Hz, and 360 Hz lines.  So wherever the source it is most likely using 60 Hz power.

I do not have a good direction for source yet, but because of times I can receive it and normal propagation I would guess west coast of North America, or maybe in the eastern Pacific, but not sure who it would be there.

T!

Josh:
I think I read somewhere haarp is going live again.

Token:

--- Quote from: Josh on June 13, 2016, 1853 UTC ---I think I read somewhere haarp is going live again.

--- End quote ---

The University of Alaska Geophysical Institute took over HAARP.  However, my understanding is that when the system was shut down some of the equipments were removed, particularly related to the individual transmitter modules (HAARP does not use one big transmitter, but many transmitter modules that combine energy).  The last I heard HAARP would not be ready for testing the transmitters until winter of 2016/17.  But it would be very possible that they were ahead of, or shifted, the schedule.

That was specifically why I mentioned the possibility that they were testing them early.  This signal really did act like past transmission from HAARP in propagation characteristics and in general direction.  However currently I would have to say that HAARP was just a possibility, nothing stronger than that.

T!

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