Appeal 2007-1326
Application 10/237,067
1 10. Young describes that its “receiver/demodulator 60 receives the RF
2 signals from the hand-held remote unit. These are provided to a
3 microprocessor 62, which puts the commands in the proper form for
4 transmission to the trains and then provides them to a modulator 64.
5 Modulator 64 performs FM modulation and provides these signals
6 through a driver 66 between earth ground 68 and a rail 70 of the track.
7 FIG. 5 illustrates in another view the electromagnetic field 22 generated
8 between track rail 70 and earth ground 68. In the preferred embodiment,
9 the signal used is a 455 Khz frequency shift keyed (FSK) signal at 5
10 volts peak-peak. This signal creates a field detectable within a few
11 inches of the track. The field will propagate along the track, and be
12 detected by a receiver 26 in a train locomotive 24. (Young, col. 3,
13 ll. 50-65).
14 11. Young describes its “circuitry inside of a train 24 running on track 16.
15 A receiver demodulator circuit 26 picks up the electromagnetic field
16 signals, and provides them to a data input of a microcontroller 84. The
17 receiver is preferably an FM receiver chip such as the MC3361
18 manufactured by Motorola. The microcontroller is preferably a 16C84
19 microprocessor. The microprocessor controls a triac switching circuit
20 86. One side of the triac switches are connected to the train tracks
21 through leads 88 which pick up power physically from the track. When
22 activated by control signals from microcontroller 84 on lines 90, the triac
23 switching circuit 86 will provide power to train motor 92, which moves
24 the wheels of the train.” (Young, col. 4, ll. 45-58).
14
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Last modified: September 9, 2013