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existing plc qrn?? or something else?
i know there are some power line communications systems in use out there.
remote reading power meters, home computer networks over existing power wires, even x10 stuff puts signals over the power line. i have been hearing a noise that i just can't identify, i have narrowed the source down to an area of 3 or 4 houses about 1/2 mile away from my station, but need to build a directional antenna to get it down closer. the real question is what might i be looking for???? recording at: http://www.k1ttt.net/audio/rfi4125AM.wav this recording was made at about the loudest peak i found at 4125khz, AM mode, 6khz wide filter. as you can hear it is a pulsing about 2 or 3 beats per second. this noise repeats at irregular intervals from at least 3410 to 4365 roughly every 30-60khz, in between the peaks there is virtually no trace of it. the pulsing is not in sync on all the peaks. to me this sounds like a multiple carrier fdm power line modem, but what kind of device would be available that operates in this frequency range?? does anyone know of a source of a noise like this?? |
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