Bit encoding of TX3 Lacrosse sensors

Signals are transmitted on 433MHz, AM (Amplitude Modulation), OOK (On/Off Keying):

• On = signal 1
• Off = signal 0

Global view of the signals:

• Bit0 encoding is a large signal one and a fix signal zero
• Bit1 encoding is a short signal one and a fix signal zero

The measures are approximated, and may vary from sensors to others.

The measures have been done with the logic analyzer described here

Detail of a bit0. Length of each bit is #2300uS, #1300uS one and #1000uS zero:

 

Detail of a bit1. Length of each bit is #1600uS, #500uS one and #1100uS zero:

 

Contact: Jean-Paul ROUBELAT - F6FBB

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