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The basic concept of half charger/ half transmitter is the same but exactly how it does it is different. Some thing like how it modulates and connect the buffer-final to the antenna are different. The output filter is different. Other items like generation of the tones values could be different due to changes in a resistor value on the TX2 IC.
I would strongly recommend dont monkey with the output! Dont start clipping parts since all are needed. The designed was set up to meet FCC reg on output power level and spur's. Esp the way it modulates the RF with the signals from the TX2 IC. Its different than a Bit. The odds are you would decrease the range or muck up how it modulates the signal so in effect your transmitter is dead if you start clipping parts.
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