The Viavi / Aeroflex NAV-401L is a completely self contained unit with built-in battery and charger supply. It is specially designed for functional testing and calibration of MKR, VOR, LOC, G/S, and COMM avionics.
The NAV-401L is designed to meet the functional testing and calibration requirements of CAT II ILS systems. It is equipped with a modulated signal generator for MKR, VOR, LOC, G/S and COMM tests and a variable output attenuator.