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The behaviour is expected by design of industry standard RC receiver modules. You should find a respective specification in the datasheet.
Quote from TSOP1738 spec:
Some examples for such disturbance signals which are suppressed by the TSOP17.. are:
• DC light (e.g. from tungsten bulb or sunlight)
• Continuous signal at 38kHz or at any other frequency
• Signals from fluorescent lamps with electronic ballast (an example of the signal modulation is in the figure below).
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