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Triggered readings

In triggered mode the program takes each reading when either an externally provided trigger pulse is received, or when the Manual Trigger button is clicked.  This enables precise synchronisation of start and end, as well as beam heading. 

To fully utilise the externally triggered facility you need a precision antenna rotator, plus the ability to supply a short trigger pulse (approx 1-5ms and +6V) to pin 8 (CTS) of a 9-pin serial port.