Airframe Excitation of the LOH-6A Helicopter at HF (2 - 30 MHz).
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
Pagination or Media Count:
CTROMAGNETIC FIELDS, ELECTRICAL IMPEDANCE, ELECTRICAL RESISTANCE, ANTENNA RADIATION PATTERNS, AIRPLANE MODELS, TEST METHODSLOH-6A AIRCRAFT, H-6 AIRCRAFTThe report describes the results of a four-month investigation of the controlled airframe excitation of helicopters in the 2 - 30 MHz frequency range. Two methods of excitation are considered magnetic and electric. Magnetic excitation is achieved by using a pair of coils placed symmetrically on the tail section of the aircraft to induce longitudinal currents in the aircraft skin. Electric excitation is achieved by covering the rear section of the aircraft with a metallic sleeve to create a high impedance gap which can be driven with a voltage source. Measurements of the impedance, radiation patterns, bandwidth, and efficiency were made on a 51 scale model of the LOH-6A helicopter in the frequency range 10 - 150 MHz. Author
- Radiofrequency Wave Propagation