Ok thanks for your answer. I followed this tutorial : http://goughlui.com/2013/11/10/rtl-sdr-a-tool-for-visualizing-broadcast-satellite-signals/
As showed, the author plugged the lnb out directly to rtl sdr without attenuator. (?) Plus, he got strong signals, I couldn't get such strong signals with hackrf. (When rf front-end amp worked)
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