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What is inside of HanRongDa HRD 747 ( Retekess TR110 is similar)receiver? The circuit board photos.
There is only one coil in the set,- the AM band ferrite antenna. All repection and signal processing is down by software and DSP and microprocessor.
There is one chip without marking what is possible an i4732 or similar.
On the last photo I marked with red the missing SM parts.I am not sure that thoe places are for different model version or just missing by bad manufacturing, causing the problems what I found in this receiver.