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In the search of an inexpensive BNC/F to RJ-45 Balun, I came across the Impact Acoustics BNC/F to RJ-45 Balun. It seemed too good to be true, at a price of under $10 each (you need 2 per camera), but I picked up a few to try and I am extremely surprised.[SIZE= 12pt]
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They use one pair of the RJ-45 connector (the brown/brown white pair) but you could easily pass multiple signals over one cable if needed.
I purchased mine from CablesToGo here
Click here to view the article
