In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

You should check your modulation frequency versus the detector you're using -- if it's close, but not right on then the detection distance will fall off considerably.  You might try 38500 and 40000 in the code above to see if that gives better results.  Of course, the ideal thing to do is look up the datasheet for your detector to see what the actual demodulation frequency is.

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