Hello, again. I tried with step attenuators and the result is there was difference around 2dB between 0 degree and 180 degree rotation of horn without attenuator. When I connected the attenuators to rx and tx paths, the difference raised around 10dB. When I change step of attenuator, I can decrease difference at 2, 3dB. But I can’t fix this.
Yes my signal is CW wiothout offset. I tried to shift the center frequency of receiver. But the result is same. But I discovered something, When I switch the center frequency with 10MHz step, like starting 4GHz to 4.4GHz with 10MHz step, there is no difference at 0 and 180 degree of horn in some frequencies. And also, If change the antenna location, I can find the location which is no difference at 0 and 180 degree in same frequency like just 4GHz. VNA is using swept technique. I know the values are uncalibrated in GNU Radio, I don’t care about the actual values at this stage, maybe i can improve the systems in the coming days but not now. Actually, When I rotate the Horn 45 degree in roll-axes, I can see 3dB decrease. In cross position, I mean 90 degree, Values are sensible. I can see the same result in VNA at the same degree except 180 degree. That doesn’t make sense. Thanks for all answers.
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