[derwil]

I'm a mechanical engineer, not electrical..........

From my understanding, during installation of the shot clock a calibration is performed of the horn vs. shot clock reading. The calibration is required due to the time lag inherant in the system: the electronic signal from the timer takes longer to get to the clock and to be displayed than it takes to go to the horn. This is due to 1. the length/type of cable used, 2. the digital to analog multi channel conversion required for the display, 3. the very quick response of horn due to the single output signal required from the timer.

Therefore, a time delta must be added to the horn function of the timer to allow the horn to sound at the same time as the display reads zero on normal play. Unfortunately, the actual timer may be stopped at a near zero situation, under the 0.1 sec mark so that the clock reads zero but if it is still inside the horn offset, the output to the horn will not be sent.

I hope this makes sense......