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1. I made the characteristics of the 1.2mH 10uF LC filter and confirm it with simulation in LTSpice.

2. Problem with phase measurement. I use the Hilbert transform, but when I reduce the amplitude on the generator, errors appear later. Do you know a better method of determining the phase? And not susceptible to noise?

3. I took the characteristics of the injection transformer using the measuring equipment that I build and also compared it with VNA (measurement from 9kHz to 1MHz). You can see that the transformer works very well up to 1MHz, even up to 2MHz, I think it can be used.

4. I injected the disturbance into the DC/DC converter

I really have a problem with noise. I limited the oscilloscope bandwidth to 20MHz of the X1 probe. I see that the noise is coming through the transformer. It is wound with twisted pair Internet. Maybe some metal can for this transformer to shield it and connect it to PE?

4. The disturbance I injected is 2V pk-pk. I know a lot, but if I give a lower value, the noise is high and the GAIN is lower. With such a value, you can see that I have obtained the GAIN characteristic like the manufacturer, but the problem with measuring the phase is high noise and what is the best method to calculate it?

Please advise me, because the topic is really interesting, I would like to isolate this noise somehow and hide this transformer in something. It's probably a problem with the electric field?