...If you don't wanna go thru all that, grab a meter and find which wire goes to the case - that's the ground. Hook that up to pin 1 of the XLR. Hook the other two wires to pins 2 and 3 of the XLR - doesn't matter which goes where.
Plug the mic in and plug in a Shure SM57 (or any other well-known mic) into another channel. Bring up the volume on the Oktava channel till it's at a comfortable level. As you keep talking, now bring up the SM57 channel slowly. If the sound seems to get softer as you bring up the Shure, you have pins 2 and 3 of the Oktava wired in reverse. Swap pins 2 and 3 and you're done.