I assembled a low pass filter using a capacitors (1nF × 6) and inductors (2.2μH × 4) for medium-wave broadcasting reception with ATS-20. Reception tests with ATS-20 receiver confirmed that the filter was functioning and that broadcast signals at 15MHz were sufficiently attenuated. However, when the characteristics were measured by VNA, it was found that the cutoff frequency was higher than the desired 2000 kHz. Next time I would like to make a filter with a lower cutoff frequency using a homemade inductor.

Link to "Design LC Filters (V 4.0 June 15, 2018 )"
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