Fun with cavity filters

Some experiments with a 430 MHz cavity filter made in a biscuit tin. More background info here:
http://www.repeater-builder.com/antenna/pdf/w6nbc-duplexer-book.pdf
https://vk6uu.id.au/warg2mduplexer.html
https://www.radioexperimenter.us/rm-1966-04/kedx.html
https://pa0nhc.nl/homemadeDuplexfilter2m/duplexfi.html

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Видео Fun with cavity filters канала Amateur Radio VK3YE