On 12/8/14, 6:15 AM, Brian Inglis wrote:
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
Pics of the waveform at
http://www.trailing-edge.com/1910-intruder-1.png and
zoomed in at http://www.trailing-edge.com/1910-intruder-2.png
Could it be an artifact of interference with NAA 1-1.8MW@24kHz
which also uses ~3MW@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
A ham friend of mine noticed that a local "grow house" radiated a lot of
power around 7.1 MHz with a very strong line structure at 183 kHz and
harmonics. (Or thereabouts, he was telling me last week, I can't
remember the exact). The 180 kHz is presumably from the DC/DC
converters driving the lights. The spectrum bump around 7.1 MHz is
speculated to be something from the physical configuration e.g. the
length of the wires to the lights.
Of course, these folks aren't particularly concerned about EMI/EMC
issues (they rent a house in a residential neighborhood and do some
redecoration). (they're not concerned, yet, until they realize that the
RFI is like a big flashing light saying "illegal grow operation here")
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