Horita will work. You can get a used one for about $50.
Try this first:
Take one more BNC, and loop the
Ref Video IN to the VIDEO INPUT on the VTR, and your problem will go away. (camera into Ref video in, ref video out to video in, video in loop to HD Extreme Genlock input. Both 75 ohm term switches OFF).
Steve Eisen
Eisen Video Productions
Vice President
Chicago Creative Pro Users Group