The not so short list
LED's
flood lights, light strips, night lights, indoor spots, even the back lights for a laptop screen.
Florescent lamps
ballasts, half dead lamps, incorrectly wired, grow lamps.
Anything pulse width or pulse duration
This can include thermostatic controls, humidity controls, ionizers, aquarium heaters, automotive block heaters, infrared motion detectors, energy saving appliances such as refrigerators, hot water tanks, hot water demand units, washer, dryer, and anything with an unshielded part 15 device inside. which leads us to part 15
Part 15 devices
It may be shielded if it does emit interference. It may not.
In a technical sense ANY switching supply is a part 15 device because they ALL emit some broad band interference. These can be anything from a baby monitor to a key fob. The small computers that control modern appliances all emit at the very least a clock frequency and harmonics as well as PWM/PDM signals.
As part of Part 15 include all your computer hardware and associated network appliances from network cards to switches, modems, cable modems, video cards, clock driven audio sampling, screen refresh rates.
I'll skip the dreaded Plasma TV as someone already covered it, several times.
Now the weird.
Lava lamp
antique 60Hz synchronous clock motor.
Neon bulb transient suppressor in an old console stereo
Replica Edison bulb (long filament) at the end of a 63 foot mains line resonating at 768KHz and ALL its harmonics.
And the technical
017877B1001A__W XM2 300HP CableUPS Technical Manual.pdf commercial
http://broadband.alpha.com/download...ower_supplies/xm2_series/technical_manual.pdf
04935410001_0610 XM2-300HP_Enhanced data sheet.pdf UPS
http://broadband.alpha.com/download...plies/xm2-300/XM2-300HP_enhanceddatasheet.pdf
http://broadband.alpha.com/download...plies/xm2-300/XM2-300HP_enhanceddatasheet.pdf
The 300HP is in a word, junk. Not only has the world passed it by it suffers from bad capacitors. In fact its major filter capacitor not only leaks physically but ESR. There are two versions of this abortifact in use. Those that have failed and those that will. These are located in Cable provider service boxes that are easily identifiable by the immense RFI field surrounding them. A simple bridge of 1N34's and a one foot wire will peg a 10ua meter within 10 feet. The failure mode is diagnosed by disconnecting your cable as it comes into the house and "looking" at the upstream with a cheap transistor radio. I guarantee broad band hash will be heard. Then check your noise floor. If it has decreased or near disappeared then you have found it.
What happens is the input to the charger is not bypassed, the free running oscillator that is the switching supply is not bypassed, the DC out to the batteries is not bypassed only filtered , likewise the rectified supply for the onboard logic is not bypassed only filtered. When the filter caps pass energy to ground there is an uninterrupted DC path out of the service box to the shield of the entire cable network spanning an entire neighborhood. Yes I said the shield of the cable becomes an antenna for the RF leakage from the Alpha .
I don't suggest that you pull these service boxes out of trees or out of the ground with your one ton dually but I seriously entertained a 5lb bucket of thermite placed on the box for the fourth of July . I was able to convince the local utility that cable company was at fault. You may not be so lucky. The power company hinted that they would not supply power to a RFI source. It was not only fixed but upgraded within days.
All I got for ya for now . carry on, as you were, the beatings will continue until morale improves...
LED's
flood lights, light strips, night lights, indoor spots, even the back lights for a laptop screen.
Florescent lamps
ballasts, half dead lamps, incorrectly wired, grow lamps.
Anything pulse width or pulse duration
This can include thermostatic controls, humidity controls, ionizers, aquarium heaters, automotive block heaters, infrared motion detectors, energy saving appliances such as refrigerators, hot water tanks, hot water demand units, washer, dryer, and anything with an unshielded part 15 device inside. which leads us to part 15
Part 15 devices
This means one thing for sure. The device possibly emits some sort of interference.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
It may be shielded if it does emit interference. It may not.
In a technical sense ANY switching supply is a part 15 device because they ALL emit some broad band interference. These can be anything from a baby monitor to a key fob. The small computers that control modern appliances all emit at the very least a clock frequency and harmonics as well as PWM/PDM signals.
As part of Part 15 include all your computer hardware and associated network appliances from network cards to switches, modems, cable modems, video cards, clock driven audio sampling, screen refresh rates.
I'll skip the dreaded Plasma TV as someone already covered it, several times.
Now the weird.
Lava lamp
antique 60Hz synchronous clock motor.
Neon bulb transient suppressor in an old console stereo
Replica Edison bulb (long filament) at the end of a 63 foot mains line resonating at 768KHz and ALL its harmonics.
And the technical
017877B1001A__W XM2 300HP CableUPS Technical Manual.pdf commercial
http://broadband.alpha.com/download...ower_supplies/xm2_series/technical_manual.pdf
04935410001_0610 XM2-300HP_Enhanced data sheet.pdf UPS
http://broadband.alpha.com/download...plies/xm2-300/XM2-300HP_enhanceddatasheet.pdf
http://broadband.alpha.com/download...plies/xm2-300/XM2-300HP_enhanceddatasheet.pdf
The 300HP is in a word, junk. Not only has the world passed it by it suffers from bad capacitors. In fact its major filter capacitor not only leaks physically but ESR. There are two versions of this abortifact in use. Those that have failed and those that will. These are located in Cable provider service boxes that are easily identifiable by the immense RFI field surrounding them. A simple bridge of 1N34's and a one foot wire will peg a 10ua meter within 10 feet. The failure mode is diagnosed by disconnecting your cable as it comes into the house and "looking" at the upstream with a cheap transistor radio. I guarantee broad band hash will be heard. Then check your noise floor. If it has decreased or near disappeared then you have found it.
What happens is the input to the charger is not bypassed, the free running oscillator that is the switching supply is not bypassed, the DC out to the batteries is not bypassed only filtered , likewise the rectified supply for the onboard logic is not bypassed only filtered. When the filter caps pass energy to ground there is an uninterrupted DC path out of the service box to the shield of the entire cable network spanning an entire neighborhood. Yes I said the shield of the cable becomes an antenna for the RF leakage from the Alpha .
I don't suggest that you pull these service boxes out of trees or out of the ground with your one ton dually but I seriously entertained a 5lb bucket of thermite placed on the box for the fourth of July . I was able to convince the local utility that cable company was at fault. You may not be so lucky. The power company hinted that they would not supply power to a RFI source. It was not only fixed but upgraded within days.
All I got for ya for now . carry on, as you were, the beatings will continue until morale improves...