Tms3705, Work distance

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FMoura

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Good morning guys,

I´m with problem with TMS3705 from Texas. This a Transceiver IC and I can read tags but the distance is very short.
Using the oscilloscope, I saw that antenna signal is very low (+/- 10V peak to peak and should be > 40V).
I did my antenna when the datasheet, but I´m whith this problem.
Anybody can help me?

Tnx very much.
 

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