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Problem with tag respond in a U2270B and Animal ID FDX-B reader design

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Hi everybody!
I'm designing Animal-ID FDX-B reader, using U2270B IC. I use single voltage power supply and diode feedback. The problem is that my tag does not responds ( I use аn oscillioscope to watch, if there is any changes on OUTPUT PIN). I see pretty good carrier signal before detector , but it doesn't change when i place my tag near antenna.( I think there must be AM signal seen). Do any-one know, what may happend?
 
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