BIRD TECHNOLOGIES' 3126A, single carrier, Wattcher(R) RF monitor. When installed with a dual port Thruline line section and two elements, is designed for the protection and monitoring of radio frequency transmission systems. The line section is selected to be compatible with the RF coaxial line used in the transmission system. The elements are selected by the user to cover the desired power levels and frequency ranges. Purpose and function abnormal loading conditions cause the transmitter to quickly shutdown, a user selectable audible alarm to sound, and an alarm LED to flash. Remote access is available for resetting audible and visual alarms. Fail-safe or non fail-safe modes are user selectable and the reflected power trip level is adjustable.