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Original thread:
Post 3 made on Monday December 19, 2016 at 14:31
3FG
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August 2009
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UEI is the developer of this XMP IR protocol and they send:
ON bursts are 208 microseconds  (8 complete modulations of 26.0us -- about 38.46KHz.  Probably the box is looking for 8 rising edges rather than a specific on time.)
OFF bursts are 758us * N * 138us  where N varies from 0 to 15.
In general, you're sending off periods that are slightly too short, about 30uS.  The tolerance here is pretty narrow--by spec each off burst must have the correct duration with +/-69us.
When you consider timing variations in the sending hardware, it't not too difficult to be right on the edge.  Try making the off durations closer to the theoretical.


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