Create design_component.md

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+## Issues
+
+ - RF Balun unmatched frequency..
+ - 2450M or 450M
+ - no 2450M balun 2:1
+ - to 450M 80M (820M) 370M
+ - Select BALF-SPI2-02D3 on onecall
+ - BALF-SPI2-02D3 output impendance not 50 ohms, droped
+ - to 610M 80M (1140M) 530M
+ - Design IF impedance for 200 ohms
+ -