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Maybe it will be a silly question for you but how can test oscillation? Which instrument should i use (SA?) and how i detect oscillation if it is present?

I don't think the problem is with power supply part because we used suitable capacitors and inductor to make a good isolation and if this is the case, we should have seen that on VNA, right?

For signal chain, multicoupler is probably adjusted to 5dB gain using variable attenuator.  

I think the problem is either oscillation or intermodulation. We will test it using a UHF filter before multicoupler tomorrow.