(C) 1996-1998 Luigi Rizzo (luigi@iet.unipi.it)
    2009,2010,2018 Jack Lloyd (jack@randombit.net)
    2011 Billy Brumley (billy.brumley@aalto.fi)

Portions derived from code by Phil Karn (karn@ka9q.ampr.org),
Robert Morelos-Zaragoza (robert@spectra.eng.hawaii.edu) and Hari
Thirumoorthy (harit@spectra.eng.hawaii.edu), Aug 1995

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