3) Offshore platform NDB

UAA-DAA 9400 P DAA9400 PF / ATU

These units ensure the automatic tuning of the antennas associated to the NDB’s installed on Offshore platforms:   UAA 9400 P for Daisy antenna,   DAA 9400 P for Long wire antenna,   DAA 9400 PF for Whip antenna. They are presented in the form of a waterproof cabinet (IP65) with dampers. The automatic tuning unit is located inside the casing. It provides the antenna with its tuning position (resonnance) despite the possible tuning capacitor variations caused by meteorological and climatic fluctuations at the installation site. The functioning of the equipment is based on the antenna reactance cancellation principle. A RF phase comparator (voltage/intensity) generates a voltage which helps to maintain the variometer on the tuning position.