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Still no 100% joy..
This filter seems to have too low coupling between resonators. Maybe a thicker rods would improve that? I will try on first occasion.
Copper sheets (RS components) did not help to reduce the losses either ...
However, this filter is better than the previous one, loss is ~2.5dB, ripple is 0.5dB in 2MHz band... good enough to be placed between LNA and amplifier.
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