MoTeC BR2 BTX - Manual (Page 32)

30 Appendices
Rain
Rain will affect the range slightly. This is allowed for in the ‘Tested Range’
calculation above.
Note that water and dirt should be removed from the lenses of the transmitter
and receiver to ensure optimum operation.
Transmitter Battery Voltage
The transmitter battery voltage does not affect the range as long as the
Transmitter LED is green (Battery Voltage > 10.5V)
Transmitter Temperature
High temperatures in the Transmitter will affect the range slightly. This is
allowed for in the ‘Tested Range’ calculation above.
Transmitter Age
The range will reduce slightly as the Transmitter ages due to a reduction in
the Infrared diode efficiency.
Vehicle Speed
The vehicle speed does not affect the range (up to 300km/hr)