I just picked up a Drake MN-4C Antenna Tuner. Only have pieces of the original manual so I may be missing some portion of it that explains the "Forward Watts - VSWR control" better. My copy says, "This switch connects the proper circuitry to allow the meter to read either forward power in watts, or VSWR, as desired." It's a push button switch and the manual doesn't say which meter function occurs at which position. Anyone have the answer to this one?