The pilot has no bandwidth - it’s a pure tone at 19 kHz, so it doesn’t get through. So, in MpxTool, everything between 20 and 56 kHz gets wrapped down into the audio, for 18 kHz frequency response on FM. In MpxTool I designed a brick-wall filter which completely stops the 19 kHz pilot, and completely passes 18 kHz and below. In 99.99% of MPX decoders (inside radios), real-world filter limitations mean that the decoding goes outside this range, so even the 19 kHz pilot appears on the output. The stereo subcarrier is demoduated by frequency-shifting it down 38 kHz, so that 38 kHz becomes 0 (DC) on the output, and 23/53 kHz becomes 15 kHz on the output. The reason is a simple matter of bandwidth. What you’re seeing IS the RDS signal being demodulated into audio, and this happens with EVERY radio.
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