The 51RV-5B is a solid-state, airborne navigation unit that combines the VOR, localizer and glideslope functions. The dual-conversion 200-channel VOR/LOC (108 to 118 MHz with 50-kHz channel spacing) and 40-channel glideslope (329 to 335 MHz with 150-kHz channel spacing) receivers are remotely controlled by 2-out-of-5 binary control or by serial information transmitted in ternary broadcast form. The 51RV-5B has the capability of dual-instrumentation circuits with internal comparison and level monitoring. Other options available are self-test functions, digital bearing output, added filtering of the basic bearing information, serial tuning, RMI servo amplifier and heads up display driver capability. The 51RV-5B has improved receiver selectivity and dynamic range over the 51RV-4. This improvement enables the unit to be immune to expected levels of VHF FM broadcast interference. The primary change is a redesigned receiver assembly A1 to meet intermodulation requirements for the 51RV-5B. The VOR/LOC Tuner has a VOR deviation damping of 1100 ms and a LOC deviation damping of 360ms. The 51RV-5B provides a Sin/Cos RNAV output. The 51RV-5B allows for the RMI needle to park when in ILS mode.