Радиоприёмник из говна и палок.
http://e2e.ti.com/blogs_/b/precisiondesignshub/archive/2014/03/31/a-guide-to-the-construction-of-an-emergency-transceiver.aspx?DCMP=hpa-pa-opamp&HQS=hpa-pa-opamp-gp-thehub-20140401-en&hootPostID=79bba6d3917bb2629d0093312bd59f1d