Device for determining the moment when competitors in a race are

Details Device for determining the moment when competitors in a race are Device for determining the moment when competitors in a race are

1980-03-25

1982-02-09

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 23, 340 32, 340323R, G08C 2100, G08G 101

Patent

active

043152422

ABSTRACT:
Each competitor in a race is provided with a transmitter. At the finishing line, two receiving antennae (10,11) are mounted which, when the finishing line is passed, are responsive to the field of the corresponding transmitter and permit an accurate determination of the moment when the finishing line is passed. The two receiving antennae (10,11) are arranged so that their directional sensitivities are rectangular relative to each other. One of the two antennae is responsive to horizontal and the other to vertical fields. A signal (25) representing the passing of the finishing line is produced when the signal of the one receiving antenna (10) is above a high first threshold value (20) and the signal of the other receiving antenna (11) is below a low second threshold value.

REFERENCES:
patent: 3526886 (1970-09-01), Lubich
patent: 3644825 (1972-02-01), Davis et al.
patent: 3697996 (1972-10-01), Elder et al.
patent: 3795907 (1974-03-01), Edwards

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