[time-nuts] 1900kHz radiolcation testing on east coast US?
Brian.Inglis at SystematicSw.ab.ca
Mon Dec 8 09:52:14 EST 2014
>On 2014-12-07 16:28, Tim Shoppa wrote:
> Would any time-nuts know of radiolocation-type testing going on, on east
> coast of US, maybe around Maine? There is a very strong wideband signal on
> 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt
> power range.
> Sound sample (recorded with 2400Hz receiver bandwidth, although the whole
> signal is far far wider bandwidth) at
> http://www.trailing-edge.com/__1910-intruder.wav <http://www.trailing-edge.com/1910-intruder.wav>
> Pics of the waveform at http://www.trailing-edge.com/__1910-intruder-1.png <http://www.trailing-edge.com/1910-intruder-1.png> and
> zoomed in at http://www.trailing-edge.com/__1910-intruder-2.png <http://www.trailing-edge.com/1910-intruder-2.png>
> On Mon, Dec 8, 2014 at 9:15 AM, Brian Inglis <Brian.Inglis at systematicsw.ab.ca <mailto:Brian.Inglis at systematicsw.ab.ca>> wrote:
> Could it be an artifact of interference with NAA 1-1.8MW at 24kHz
> which also uses ~3MW at 60Hz for deicing on the inactive array,
> as it is now below freezing and fairly humid in coastal Maine
> http://en.wikipedia.org/wiki/__VLF_Transmitter_Cutler <http://en.wikipedia.org/wiki/VLF_Transmitter_Cutler>
On 2014-12-08 07:30, Tim Shoppa wrote:
> 80*24 = 1920. 80th harmonic seems quite a stretch unless there is some malfunction (as you point out maybe an interaction with 60Hz heating... hmm... maybe they thought they could use PWM on the heating circuit.). For sure they have enough power and enough wire in the air to do the damage being observed.
> Do you know what the "normal" 24kHz waveform looks like? (FSK, MSK?)
> Some of the locals think it is iceland and that is pretty much the same beam heading as Cutler Maine. OK "beam" is a little optimistic,but we do have directional antennas for 160M and we do know which way is NE :-)
Articles about NAA VLF say MSK at 24kHz, that the deicing power available is quadruple the 3MW at 60Hz to meet time goals, and it is operated remotely from somewhere around DC!
Take care. Thanks, Brian Inglis
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