I recently broke down a non functional APC ES BE725BB UPS. I now want to re-purpose the the coax surge suppressor board. Unfortunately I tossed the case/housing in the recycling bin weeks ago and have no idea which side is the input side, and which is the output side. The board's mounted components are under a metal shield that is soldered to the board. I was hoping I could get some guidance on figuring this out from the traces on the rear of the board with a multimedia. I would like to avoid having to desolder the shielding if possible.
I had no luck trying to find a schematic of the UPS online, nor even some pictures of the unit opened up. Pictures are below:
i dont know if what you have is a typical surge suppressor that im use to but ill describe what you often install out in the field for coax surge suppression for broadband TV or CCTV.
basically you have these rectangular metal cans with an f terminal marked equipment and an f terminal marked field. if you open them up and look insideand the center core of the input has a bare wire that goes straight over to the output terminal and halfway between there is a trans-orb that goes to the metal casing.
essentially, there is no real input and output, its just a straight through connection with a transorb to ground, if you get enough of a + or - voltage the transorb will conduct to ground and crowbar the surge.
what you have there MAY be different but i really doubt it.
The shunted current shall go to ground the shortest possible way, so I vote on the side with the "GRN" terminal as being antenna port.
Thanks for the replies. Like Ben said, I am thinking it doesn't matter, and the antenna being close to ground makes sense too.