I wanna make this operation in far-field so i calculated from (2D^2)/λ and made this distance almost 2meter. My horns are good at 4GHz i am working at this freq. I adjust RX and TX gain with range operator in GNU, I mean for the observation I am changing gain. To see the signal, I need to make 70dB gain so i set 30dB RX gain and 40dB TX gain. I raised gains 60dB for observation but nothing change. By the way, if tx gain is at 40db and rx gain is at 30db, the signal level is -75dB.
Thanks for the advice. I will try attenuator.
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