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Silly tread
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ebastler:

--- Quote from: 001 on November 29, 2018, 08:52:24 pm ---i mean some modem-like hum

--- End quote ---

Besides the dominant 5 kHz, there are also pronounced harmonics (mostly the odd ones) of 50 Hz.
001:

--- Quote from: Richard Crowley on November 29, 2018, 08:14:29 pm ---

* Remember that when using a coil for direction finding, when you have a null, the source is perpendicular to the coil axis.

--- End quote ---

It is strange thing
"Quiet" position is for horisontal pickup direction
Richard Crowley:

--- Quote from: 001 on November 29, 2018, 10:14:10 pm ---It is strange thing
"Quiet" position is for horisontal pickup direction

--- End quote ---

That may indicate that the source is on your floor (not the data center above).

Ref: https://en.wikipedia.org/wiki/Loop_antenna#Direction_finding_with_small_loops
ogden:

--- Quote from: ebastler on November 29, 2018, 07:57:19 pm ---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?).

--- End quote ---

Yes, I missed it. If audio equipment itself is not actual source of "5HKz" (setup tested in other place), but EMI is present even when whole test setup powered form single wall plug - run. Rent another place.
Circlotron:

--- Quote from: Richard Crowley on November 29, 2018, 08:14:29 pm ---* Remember that when using a coil for direction finding, when you have a null, the source is perpendicular to the coil axis.

--- End quote ---
With an AM radio the null is when the loopstick axis points directly at the source. Is there some difference between an air cored loop and a ferrite loopstick in this regard?
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