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docu: more details to the RF transformer and coupling
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@ -76,10 +76,13 @@ Not at the moment. The embedded CCS solutions on ESP32 or STM32 are implementing
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### Q8: Which side of the TPlink is the PE and which is the CP?
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### Q8: Which side of the TPlink is the PE and which is the CP?
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The TPlink has a RF transformer with 3 coils. Two coils are connected to the modem chip (the transmit and the receive path), and the
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The TPlink has a RF transformer with two or three coils. One or two coils are connected to the modem chip (the transmit and the receive path), and the
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third coil is the way to the outside world, in our case the CP and PE. The modulation does not care for the polarity of this path. It uses
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last coil is the way to the outside world, in our case the CP and PE. The modulation does not care for the polarity of this path. It uses
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radio frequencies in the range of 2MHz to 30MHz.
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radio frequencies in the range of 2MHz to 30MHz.
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This means, it does not matter which side of the "outside coil" is connected to PE and which to CP.
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This means, it does not matter which side of the "outside coil" is connected to PE and which to CP.
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The only important thing is, that the coil does not connect directly to the CP and PE, because this would destroy the 12V PWM signal, which
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The only important thing is, that the coil does not connect directly to the CP and PE, because this would destroy the 12V PWM signal, which
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lives in parallel on the CP / PE lines. The coupling network of 1nF and 150ohms in series assures, that the RF signals and the 12V PWM
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lives in parallel on the CP / PE lines. The coupling network of 1nF and 150ohms in series assures, that the RF signals and the 12V PWM
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are not interfering each other.
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are not interfering each other.
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The picture shows the two-coil variant:
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![image](TPlink_RF_transformer_and_coupling_network.jpg)
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doc/TPlink_RF_transformer_and_coupling_network.jpg
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