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I am looking for any assistance regarding replacing a very old Panasonic Mulitplexer WV CU350 with something new to remote control 2 very old ( sorry don't know camera make or model) PTZ cameras that are mounted up 75' in the air at a golf course. Cameras are working fine via coax but controller is so old it is falling apart. Is there a product which could control these unknown PTZ cameras via coax or am I going to have to replace these 2 working cameras? Thanks