23cms filters
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There are plenty of designs available for 23cms filters:
- Simple band pass filter for 23cms by GM8OTI
http://www.marwynandjohn.org.uk/GM8OTI/proj23cmBPF/proj23cmBPF.html
- Modified cavity filter for 23cms published in CQ-TV 245
The following suppliers sell built and tested units:
- Antennair - suppliers of the DTX1
- DG0VE - German supplier of reasonably priced filters for most amateur bands