Re: Camera on Power-Line Adapters

[ABLE1 <someone@xxxxxxxxxxx>]

On 1/21/2018 12:10 AM, E D wrote:
> Hi Les,
>
> Glad to hear that it worked for you except for when the sign is on...minor details.
>
> I found this link: http://ieeexplore.ieee.org/document/6814439/?reload=true titled "The influence of fluorescent lamps with electronic ballast on the low voltage PLC network. The PLC being the PowerLine Channnel.
>
> It appears that the PLC can be easily affected by the lamps. That is not something that I was aware of, nor have experienced before. I even found an article about an illegal pot grower who was using high power fluorescent lamps for growing and had the "Interference Police" (the local internet company's Interference Tech) knock on his door. His growing operation was affecting Internet communications for the neighborhood!
>
> Quoting from the article, "In the (3kHz-150kHz) the interference level from fluorescent lamps is significantly below the allowed maximum PLC signal levels. In the 150kHz-30MHz band however, PLC signals compete with Electromagnetic Compatibility (EMC) levels.
>
> Basically, fluorescent lamps on- PowerLine Channel compromised.
>
> It should be possible that by having an isolated 120vac line for the video and powerline adapters, that this would provide enough isolation for the errant and unwanted interference. There may also be a possibility that the fluorescent "radiation field" could still interfere with the PLC channel, but that should be to a lesser extent. If this happens, you could isolate either the ballasts or your equipment at the sign, or both, with an EM shield. Much like shielded CAT5 wiring that is wrapped with foil, you could outer-wrap your wiring and anything else that you deem fit, making sure that you will not be causing any
> heat-accumulation to any wiring or equipment.
>
> You would also want to look at any interference being caused at the other end of the line, where the other powerline adapter is- in relation to the wiring that goes out of the building to power that sign. Just because a/c power is flowing out to the sign, interference is not limited to one-way. The EM field of the power wiring could carry an interference wave and also be affecting the other adapter. A radiation shield could be also needed there. Also, if there is any type of power-switching equipment at the building end for any other sign, I would take a look at that also.
>
> I carry an electromagnetic field apparatus that will detect any fields in the x,y,z axis. It has been very handy in the past. There was a customer with a cellular radio on his alarm system, who suddenly had communication problems. I went to his home one evening, and sure enough, the signal strength was way down from the original installation. I took out my 'voodoo' apparatus and noticed that there was strong interference coming from around his television which was only about 8' from the radio. I asked him a few questions about if anything had changed in that location. He said that this was the same tv as before. I persisted and then the light came on in his head, and he admitted that he had just recently bought one of those flat antennas for his tv in order to get local channels. I had not noticed it since it was flat and not readily identifiable. Sure enough, he took it down and cellular signals were restored. You just never know what could be causing interference.
>
> I am sorry that you have run into this problem, but persistence will win in the end. It appears that you have a very healthy dose of that.
>
> ...In jest, maybe you could just provide the owner with a remote app to turn off the sign when he needs to view the camera!
>
> E D
>

E D,

Thanks for the link.

The only way the EMF or RF from the fluorescent fixtures can get into
the would be on the sign side where it is exposed wiring.

The Powerline adapter is inside a metal enclosure.  If that is true
then separating the circuits by installing a transformer will not
help since the wiring for the 'now' dedicated circuit is still exposed
to the EMF or RF that is inside the sign.

Did I type that correct??

Thanks!!

Les