AN/ARN-149(V) low-frequency automatic direction finder Provides enhanced navigation for military aircraft around the world. The Rockwell Collins AN/ARN-149(V) is the first low-frequency automatic direction finder to provide an internal, field-upgradable MIL-STD-1553B digital multiplex bus capability. This system, consisting of a receiver, control, antenna and mount, provides a low-frequency automatic direction finding function in a lightweight, easily installed set. The all solid-state receiver eliminates all moving parts such as goniometers, synchros and mechanical tuners. Quadrantal Error Correction (QEC) is set by aircraft connector strapping, eliminating corrector modules and airframe-specific internal adjustments. The antenna combines the loop and sense antennas and preamplifiers in one compact housing, thereby eliminating expensive sense panels, couplers and special prefabricated cable assemblies. A dual version of the same antenna is also available in one aerodynamic package. The receiver is controlled by a four-wire serial bus from the control. >> Two preset emergency channels >> Easy retrofit; uses existing control wiring in most cases >> Internal QEC, connector-strapped; airframe wiring sets QEC KEY FEATURES >> Lightweight – under 11 lbs for complete system >> Meets RTCA MOPS >> Synthesized digital tuning >> High reliability; predicted MTBF is 4,900 hours >> Internal, field-upgradable, MIL-STD1553B compatibility (input and output functions) with retention of analog interface >> 100 to 2199.5 kHz frequency coverage in 500 Hz steps; positive digital selection >> Integrated sense-loop antenna, dual antenna available for dual installations >> Dual identification tone filter enhances Morse tones for positive aural identification even with noisy reception conditions >> Coherent detection for improved adjacent channel rejection >> DO-160 rated for hard mounting in helicopters and fixed wing aircraft >> Enhanced maintenance; hinged chassis for easy access to modules for fast fault isolation; compatible with existing ADF test equipment >> Design refresh 2011

operating features The Rockwell Collins AN/ARN-149(V) LF ADF system provides automatic pointing to low and medium frequency non-directional beacons (NDB), standard broadcast stations and emergency stations on frequencies of 500 and 2182 kHz. The frequency is selected in 500 Hz increments on the control, or via the MIL-STD1553B data bus. The receiver processes the signals received from the integrated dual loop and sense antenna and provides bearing information to a standard radio magnetic indicator (RMI) via the 3-wire synchro interface and to either a cockpit display unit (CDU) or an aircraft...