**Nonlinear** Matthew (NB0X) What's it all about? # [SDF.org](http://SDF.org) related activities: * [Gopherhole](gopher://sdf.org:70/1/users/nonlinear/) * [SDF Amateur Radio Club](http://sdfarc.org) # Amateur Radio Notebooks * [Digital Voice Notebook](/ham/dvnotebook.md.html)


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