Ikegami 9 inch color CRT production monitor, no picture

[lexmarks567]

I bought a 9 inch ikegami CRT color broadcast monitor model TM-9 manufactured November 2000. I bought it to test some vintage video equipment but I cannot get it to produce a picture. I know the TV works. I currently using a standard RF or coaxial or aerial lead depending on your country and to make it work with the SDI inputs on the monitor I'm using a BNC male to F female adapter monoprice part 4125. Do I need a actual RF to SDI converter if such a thing exists?