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Lost Model Finder

Addendum – Software Revision 1.1

Software Enhancements:

Two software changes have been made to version 1.1 to improve the operation of the Lost Model Locator (LML – formerly Lost Model Finder - LMF).

Improved Low Voltage Detection Warning:

A low battery qualification period was added, such that the low battery warning will not sound until the battery voltage has dropped and remains below the trigger threshold, which is 1.15 volts per cell, or 4.6 volts for a 4-cell pack and 5.7 volts for a 5-cell pack.  The voltage must continually remain below this threshold for approximately 1.5 seconds before the low battery warning will sound.

The LML with software version 1.0, would immediately sound the low battery warning if the voltage sagged below the trigger threshold.  If a small capacity battery pack OR a battery pack constructed with high internal resistance cells was used to power a receiver and two or more, higher current servos, the LML may “chirp” at the beginning of the low battery warning.  The battery voltage would quickly rebound when the servos stopped moving and the low battery warning would cease.

The LML with software version 1.1, requires the battery voltage remain below the threshold (1.15 volts per cell, or 4.6 volts for a 4-cell pack and 5.7 volts for a 5-cell pack) continuously for approximately 1.5 seconds before the low battery tone will sound.  If the voltage spikes below threshold for less than 1.5 seconds, then rebounds, the 1.5 second counter is reset.  In other words, multiple random voltage sags below the threshold will not trigger the low battery warning, unless a single, continuous, battery voltage sag lasts longer than 1.5 seconds.

Extended Testing And Qualification Of Pulse Width Input:

The LML with software version 1.0, would sound the lost model tone if there were no positive going pulses detected from the receiver/servo input to the LML.

This test procedure was enhanced with version 1.1 to allow lost tone activation with PCM receivers, receivers whose signal remains high when the corresponding transmitter is turned off, receivers whose signal remains low when the corresponding transmitter is turned off, or a transmitter switch programmed to activate the lost tone.

If the signal input remains high, without any pulses or activity for 35ms or more then the lost model tone will sound.  If the signal input remains low, without any pulses or activity for 35ms or more then the lost model tone will sound.  If a pulse occurs with a duration of 1 millisecond or less, then the lost model tone will sound.

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