Abstract: A simple and easily-installed system for vehicles equipped with an extensible pole, mast, boom, or other structure, providing an audible alarm when the operator attempts to drive away without first completely retracting the pole, mast, boom, or other extensible structure. The system includes a sensor for sensing a first position and a second position of a vehicle's gearshift lever, and a control module. The control module receives an electrical signal from an extensible structure when the extensible structure is fully or partially deployed and communicates the electrical signal to an audible alarm if the sensor senses that the vehicle's gearshift lever has been moved from the first position to the second position.

Abstract: A simple and easily-installed system for vehicles equipped with an extensible pole, mast, boom, or other structure, providing an audible alarm when the operator attempts to drive away without first completely retracting the pole, mast, boom, or other extensible structure. The system includes a sensor for sensing a first position and a second position of a vehicle's gearshift lever, and a control module. The control module receives an electrical signal from an extensible structure when the extensible structure is fully or partially deployed and communicates the electrical signal to an audible alarm if the sensor senses that the vehicle's gearshift lever has been moved from the first position to the second position.

Abstract: A receiver and method for detecting a Manchester coded waveform is disclosed. The waveform is clocked to provide a number of digital samples of each positive and negative pulse. Each positive pulse is validated provided that a predetermined number (k) of the total samples (N) is more positive than a positive (+T) threshold level and a predetermined consecutive number (j) of the samples (N) are more positive than a negative (-T) threshold level. Each negative pulse is validated provided that (k) of (N) samples is more negative than the -T threshold level and (j) of (N) are more negative than the +T threshold level. Each data bit pulse synchronizes each succeeding data bit pulse by providing a predetermined time interval during which the midpoint of each pulse must change between a positive and negative waveform.