The main purpose of the measuring coupler is to provide the reflection alarm unit with rectified signal of the output power to the antenna and reflected power. Two coupled signals are also made available for testing with, for example, a spectrum analyser. The input is to connector J2, the output from connector J1. The samples are obtained via four directional couplers. The rectified signal are available at two levels via connector J5. The other samples are available from separate connectors, J3 and J4. Typical value: Middle frequency 465 MHz Forward Po = 30 W Uo = 0,427V Backward Pr = 3.0 W Uo = 0,477V Refl. fact. 20 J3 and J4 -40dB