Need help finding the source of noise interference

[BilboFett]

Attached pics and vid are ANY connection, either VHS or LD input!.
You can still see the interference w/ the TBC, its not pure black. there's movement.
I changed cap cards, and from desktop to laptop, and changed outlets to a different room.
Its still the same.
If its BOTH the VHS player and the Laserdisc player, and ANY cap card.. its not those devices, its the house, imo?
I just need to know WHAT in the house is causing it.
I relocated to a different room, everything off (lights, utils, etc.), using a different laptop, and cap card.
Same interference.
I'm concerned its a whole-house ground loop or bad wiring or something.
Any ideas? Anyone recognize this pattern?







Vid is w/ TBC on. You can still see movement, interference.
w/the TBC plugged in:
Sample:
1) https://we.tl/t-ANurzz8XTb

or

2) https://mega.nz/file/ZQlxQA5L#u0SdJs...shguG7_4HbexgU
(use Chrome to auto-decrypt in the download)

or

3) https://gofile.io/d/Qjs5yC

[Emulgator]

Could be proximity to any mobile phone antenna "bouquet" mounted in the neighborhood which may introduce such interference.
Indeed ground loops would be the first to search and destroy, testwise lifting Protection Earth on one or the other device...
I had to introduce some soft grounding here to make signal cable shields the master reference.

[BilboFett]

Originally Posted by Emulgator

Could be proximity to any mobile phone antenna "bouquet" mounted in the neighborhood which may introduce such interference.
Indeed ground loops would be the first to search and destroy, testwise lifting Protection Earth on one or the other device...
I had to introduce some soft grounding here to make signal cable shields the master reference.

Thanks, I don't know what "lifting protection earth" means. Nor do I understand whats involved to make signal cable shields a "master reference".
Can you elaborate please?
In another forum today, they said "don't underestimate dirty power, try a power conditioner/UPS and try the signal again after".
Now I have some ideas for testing.

[Emulgator]

I would start with "inborn" sources.
Switch off mobile phone. switch off any WLAN, Modem, Repeater, WiFi remote, Bluetooth, any SMPS not needed.

The other measures: Only if one is confident in his abilities concerning handling of electricity, mains voltage, measurement,
conclusions, soldering, opening and successfully repairing devices, building adapters.
Class 2 power wiring (2-lead) gives no ground loop problems, Class 1 power wiring (3-lead) does.

Historically it was a cheaper solution to implement signal paths within devices unbalanced.
Even outside of devices: Unbalanced became the norm. For safety reasons Reference is/was (CASE)_GND.
Fat leads would solve all those safety problems, but the assumption that this would keep signal fidelity as well did not hold true.
Instead this became the Nr.1 billionfold problem world wide:
Unbalanced means different paths and abuse of the other signal lead: GND
Any induced voltage or leaking current into GND would deteriorate signal quality.
Just because any following amplifier applies gain on what it sees on its input:
the difference between the signal lead and the abused CASE_GND.
Most audio processing from microphones needs +30dB Gain upfront, sometimes (ribbon mics) +70dB,
most processing (filtering) will attenuate, and again: we need gain.
Such gain chains make any dirt audible, in video visible.
May it be interference from RF shielding, ripple charging currents from case mounted filter caps,
induced voltages from mains transformer stray field, the combined dirt from SMPS viciously hacking into HV DC.
The better solution (balanced) was developed for professional audio: Transformers can separate signal from GND,
and shielded twisted pairs plus appropriate 3-pole connectors can keep fidelity quite good, even over considerable lenghts.
In analog video I haven't seen balanced often.
CVBS (the yellow RCA Cinch) is Unbal, S-Video (the 4-pin Mini-DIN) is Unbal, most video connectors are BNC, so Unbal.
From DV and HDMI on digital video signals are transferred as differential pair.

Danger of Damage because leaking currents can no longer be drained, up to electrocution !
PE (Protection Earth) is the 3rd lead of the power cable connected to Case GND.
Depending on country it may be YEL/GRN (EU), or RED (UK old?) or GRN (USA).
Testwise opening this connection helps tracing ground loop faults.
If power plugs can be opened still, it is easily possible to unsolder/unscrew the PE lead testwise.
If there is fixed/molded wiring involved: most of the time hard to achieve, since this is not intended.
Within a device it becomes much harder to achieve, IEC60320-C6, IEC60320-C14, IEC60320-C16, IEC60320-C20,
a certain NEMA 5-15 used by Rhodes, a certain obsolete german 250V/6A and many others may have directly grounding mounting lugs/clamps/brackets/shells,
and there are lots of other 3-pin male device plugs in the world which do hardconnect to CASEGND by design without wiring.
Any SMPS shielding becomes ineffective, so RF interference may come out worse.
All (data) connections have to be made before power-up ! Connecting while powered can destroy any port !
If you decided to open any PE wiring: Be prepared to encounter a certain amount of leakage voltage on metal parts.
Measure first against known GND. Do not grasp any device with full hand, just touch slightly with wrist.
After diagnosis: Refix PE, get a "Mantelstromfilter" (don't know the English wording)
There are multiple "RF Suppressors" (ferrite tunnel cores) available: usually hollow half-cylinders which can be closed around any offending cable.
Inserting well-defined resistors within certain devices, bypassed by clamping diodes and RF Caps are my best invention here, but: See above...

[BilboFett]

Originally Posted by Emulgator

I would start with "inborn" sources.
Switch off mobile phone. switch off any WLAN, Modem, Repeater, WiFi remote, Bluetooth, any SMPS not needed.

The other measures: Only if one is confident in his abilities concerning handling of electricity, mains voltage, measurement,
conclusions, soldering, opening and successfully repairing devices, building adapters.
Danger of Damage because leaking currents can no longer be drained, up to electrocution !
PE (Protection Earth) is the 3rd lead of the power cable connected to Case GND.
Depending on country it may be YEL/GRN (EU), or RED (UK old?) or GRN (USA).
Testwise opening this connection helps tracing ground loop faults.
If power plugs can be opened still, it is easily possible to unsolder/unscrew the PE lead testwise.
If there is fixed/molded wiring involved: most of the time hard to achieve, since this is not intended.
All connections have to be made before power-up ! Connecting while powered can destroy any port !
If you decided to open any PE wiring: Be prepared to encounter a certain amount of leakage voltage on metal parts.
Measure first against known GND. Do not grasp any device with full hand, just touch slightly with wrist.
After diagnosis: Refix PE, get a "Mantelstromfilter" (don't know the English wording)
There are multiple "RF Suppressors" (ferrite tunnel cores) available: usually hollow half-cylinders which can be closed around any offending cable.
Inserting well-defined resistors within certain devices, bypassed by clamping diodes and RF Caps are my best invention here, but: See above...

I've already tried it with all those off. I will try a UPS sine-wave AVR UPS next for dirty power. I'm not an electrician and I'm not playing with electricity

[BilboFett]

ok. UPS w/ AVR Sinewave for dirty power plugged in. I'm stumped man.