Automatic RF leveling in passenger aircraft video distribution s

Details Automatic RF leveling in passenger aircraft video distribution s Automatic RF leveling in passenger aircraft video distribution s

1991-04-08

1993-06-15

Eisenzopf, Reinhard J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

455 63, 455 14, 4552342, 4552532, H04H 102

Patent

active

052204197

ABSTRACT:
A passenger aircraft video distribution system distributes modulated RF signals provided from a central signal source to be used at each passenger seat. The RF signals are distributed by means of various RF components, including amplifiers (90, 14a, 164, 24a, 24b, 34a), taps (180, 210) and splitters (108, 182, 214). In order to ensure proper RF levels for best tuner operation, each of a number of stations in the distribution system is provided with a variable gain amplifier (90, 14a, 164, 24a, 24b, 34a) controllable by a microprocessor (92, 50a, 220, 52a, 56a, 216). A separate service line (222, 224, 226, 228, 230, 232, 234) enables a central microprocessor to monitor RF levels at different stations to automatically provide, via the same service line, appropriate gain control signals to obtain proper RF levels. The monitored RF levels are also employed for diagnostic purposes.

REFERENCES:
patent: 2857482 (1958-10-01), Putzrath et al.
patent: 3704419 (1972-11-01), Rheinfelder
patent: 3737774 (1973-06-01), Verhagen
patent: 4439784 (1984-03-01), Furukawa et al.
patent: 4584603 (1986-04-01), Harrison
patent: 4866515 (1989-09-01), Tagawa et al.

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