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Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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194 ORB-TRACKER: AUTOMATIC SATELLITE AZ-EL ROTOR CONTROL
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these programs can be easily utilized to control the Orb-Tracker s STAMP 2, which in turn controls the AZ-EL rotators. Polar satellites cross the sky in ascending or descending orbits around the globe, crossing over the north and south poles during each revolution around the earth. In order to track these moving satellites and maintain the maximum signal emitted by satellites, amateur radio operators must move their antennas both in elevation and azimuth, meaning one rotator must be able to rotate 360 in the horizontal plane and the second rotator must move up and down from the horizontal plane through at least 90 to pole or vertical. The Orb-Tracker can simultaneously control two rotators, using the data from the serial port, once the proper satellite data set is plugged into the tracking program. The OrbTracker is designed to be used with two inexpensive TV rotators, which use positive and negative drive voltages and variable resistors to indicate position, such as Orbit 360 rotators. The Orb-Tracker, as mentioned earlier, will also drive the dual-rotator Yaesu 5500 AZEL rotator.
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The heart of the Orb-Tracker is the BASIC STAMP 2 processor, an A/D converter, a power supply, and a handful of discrete components. The diagram in Fig. 15-1 illustrates the OrbTracker for use with the Orbit 360 type low-cost TV rotators. The serial data output from your PC tracking program (NOVA/WISP) is fed to the DB-9 serial connector at the top left of the diagram. The serial port connector also does double duty, since it is also used to program the BASIC STAMP 2 microprocessor. The BASIC STAMP 2 serial port connections are on pins 1 through 4, respectively (the TX, RX, ATN, and ground pins). The Orb-Tracker s A/D converter samples the position voltages from both the azimuth and elevation rotators. These analog voltages are converted into digital numbers by the LTC1298 converter. The position voltage from the rotators varies between 0 and 5 Vdc, depending on the position of the rotator. This value is converted into a digital number that varies from 0 to 4095. The resolution of the Orb-Tracker is theoretically 360/4095, or 0.087 . This digital number is sent serially to the BASIC STAMP 2. Simultaneously, the STAMP 2 is also getting new position data from the tracking program, which it uses to compare the last known position of the rotators to the new positions coming from the track program. The BASIC STAMP 2 compares these two voltages in order to decide whether the rotator needs to be rotated clockwise or counterclockwise in order to make the rotator position value equal to the satellite s new position value. The Orbit 360 rotators are dc-controlled motors. This means that reversing the power leads reverses the direction of rotation. This makes direction control fairly easy, using two relays per rotator. One relay serves as a switch to turn 12 V on or off. The other relay switches 12 V The outputs from these . two relays are tied together to one power lead of the rotator. The other lead is connected to ground. Since both relays are never turned on at the same time, there are no problems with two relay outputs tied together. In order to protect the Orb-Tracker system in the event of a microprocessor crash, two 50- 10-W current-limiting resistors are placed in both the 12-V and the 12-V power leads. The relays chosen for the Orb-Tracker are Potter & Brumfield JWD-107-5 units. The
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GND 5 P0 6 P1 7 P2 8 P3 9 P4 10 P5 11 P6 12 P7 1 5 5 CS CH0 CH1 GND
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