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The old dvr doesn't work so not sure how good the cameras are so maybe but new dvr that uses coax

My church has 22 older cameras that are connected by coax. I would like to replace the cameras with Ring or Wyze cameras. How can I power the new wireless cameras using the old coax cables? Thought about useing a poe switch, then an adapter from cat5 to cable then another adapter from coax to...