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Silly tread
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ebastler:

--- Quote from: ogden on November 29, 2018, 06:57:03 pm ---I would switch off anything in that house except guitar+amplifier+recording_laptop_on_batteries and check that interference is gone or not. If not then find it.

--- End quote ---

Good idea in principle; but you probably missed the post where 001 explained that this is in an basement below a data center (server room?). If he meant that literally, I don't think they would be supportive of the "switch it all off" approach...  ;)
Richard Crowley:

--- Quote from: 001 on November 29, 2018, 06:37:28 pm ---I rotate pickup and now I find "quiet" position
--- End quote ---
Then you have an "accidental" direction-finder.
You can rotate the pickup to find the null (*) and maybe even triangulate to the source.
(If it is a point source, which it may not be)
And you should be able to move around and get a stronger signal as you move closer to the source, etc.

* Remember that when using a coil for direction finding, when you have a null, the source is perpendicular to the coil axis.
coppercone2:
if you play those backwards you hear some stuff about spilling the blood of the innocent and burning crosses
ebastler:

--- Quote from: 001 on November 29, 2018, 06:37:28 pm ---I rotate pickup and now I find "quiet" position
But now I can hear some chirping and new HFhum  :-// (dont worry about mains buzz)
Hear it:

--- End quote ---

That's still the same 5 kHz frequency. (With mains buzz in the first clip, without in the second.)
001:

--- Quote from: ebastler on November 29, 2018, 08:39:45 pm ---
--- Quote from: 001 on November 29, 2018, 06:37:28 pm ---I rotate pickup and now I find "quiet" position
But now I can hear some chirping and new HFhum  :-// (dont worry about mains buzz)
Hear it:

--- End quote ---

That's still the same 5 kHz frequency. (With mains buzz in the first clip, without in the second.)

--- End quote ---

i mean some modem-like hum
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