<https://secure.gravatar.com/avatar/b1d87d2ee85af3e51479df87928bdc88?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://toolsweek.com/how-to-test-coax-cable-signal-with-multimeter/>