RA3502 Remote ADF Receiver System

The ADF 3502-() Receiver is designed for professional applications ranging from 190.0 kHz to 1799.5 kHz. The system is ideally suited for installations where minimum space is available. The small, lightweight control unit CU 5502 fits into a standard 2 ¼” (57mm) round instrument cutout and is only 2 ½” deep.

The ADF receiver can be installed in any convenient place on the aircraft. The RS 422 interface between CU and Rx reduces inter-wiring. The control unit CU 5502 offers a clear, high-contrast, double-line display that is readable under all lighting conditions, even in bright sunlight.

Using variable speed frequency control, the frequency can be selected in 0.5 kHz/1kHz or 10 kHz/100 kHz steps. The pre-selection in the channel memory of the preset display allows instant switchover by pushing a “Flip-Flop” key to a new NDB en route for indication of the cross bearing for a position fix relative to a second NDB. The receiver's output is compatible with indicator ID 3502 and the converter AC 5303/04 for RMI.

The ADF 3500 system features an extensive automatic self-test function. After switch-on, the microprocessor and the frequency synthesizer are thoroughly checked by a test subroutine. CDU of FMS systems can also control the remote receiver RA 3502-() unit.

JTSO certified for either VFR or IFR use in all types of fixed-wing and rotary-wing aircraft, the ADF receiver can also be combined with other Becker Prime Line equipment, such as VHF-COM, NAV-VOR/ILS navigation, and Mode S transponder systems, which have similar control units, providing a pleasant presentation in the panel.