Apple II series computers are used where main power is available. Receivers may be placed up to 7000 meters from the computer with a pair of wires to pass data. Battery powered single board computers are used where power is not available. Interfacing the computer to the receiver and measurement algorithms are described. Criteria used to detect low quality data are discussed.
Programming is in basic language with calls to assemble language routines where speed is critical.
The programs can be readily modified by the user in the field. Methods of data handling to facilitate interfacing to spread sheets and data bases are also given. Data in the Apple system is stored on floppy disk and in RAM on the single board systems. Data in the single board systems is off loaded using an RS-232 interface. For reprints, please correspond with the author of the paper.