various stuff on radio circuits

https://www.allaboutcircuits.com/textbook/semiconductors/chpt-9/radio-circuits/


http://www.instructables.com/id/Three-Transistor-Short-Wave-Radio/


http://www.ke3ij.com/am-univ.htm


https://makezine.com/2007/09/17/how-to-build-a-crystal-sh/


https://hackaday.io/event/27914-fundamentals-of-rf-hack-chat/log/70019-fundamentals-of-rf-hackchat-transcript




some stuff to get people started on RF signals



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excel shortcuts. good article....

here is a nice link to an article on shortcuts in excel  https://interestingengineering.com/top-40-best-excel-shortcuts-need-know