Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-10-03
1976-08-31
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325115, 325186, 343705, H04B 102
Patent
active
039784100
ABSTRACT:
An aircraft-crash location transmitter tuned to transmit on standard emergency frequencies is shock mounted in a sealed circular case retained in a recess atop the tail of an aircraft by means of a shear pin designed to fail under a G-loading associated with a crash situation. The antenna for the transmitter is a metallic spring-blade having a curved cross-section and coiled like a spiral spring around the outside of the circular case, the free end of the antenna abutting the surface of the recess when the case is retained therein by the shear pin for maintaining the antenna in a furled state. A battery within the case for powering the transmitter is kept trickle-charged from the electrical system of the aircraft through a break-away connector on the case that also serves to mechanically hold-open the transmitter key until the connector separates.
When a crash occurs, the resultant ejection of the case from the tail due to a failure of the shear pin releases the free end of the antenna which automatically uncoils due to its spring-like nature. The accompanying separation of the connector effects closing of the transmitter key and results in commencement of transmission. The ejected case lands with the transmitter in operation and the antenna deployed, such operation continuing until the battery is exhausted.
REFERENCES:
patent: 2825803 (1958-03-01), Newbrough
patent: 3102982 (1963-09-01), Stypulkowski et al.
patent: 3174103 (1965-03-01), Monroe
patent: 3335371 (1967-08-01), Yandell
patent: 3553587 (1971-01-01), Aass
Fletcher James C. Administrator of the National Aeronautics and Space
Manoli Robert
Ulrich Bertram R.
Bookbinder Marc E.
Griffin Robert L.
Manning John R.
Porter G. J.
Wofford, Jr. L. D.
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