What is CESSB, I hear you ask. Wiki has the simple answer. CESSB (controlled-envelope single-sideband) is a narrowband modulation method using a single sideband, whose peak envelope level is controlled so that the peak-to-average power ratio of CESSB is much reduced compared to standard SSB modulation and offers improved effective range over standard SSB modulation while simultaneously retaining backwards compatibility with standard SSB radios.
See also David L. Hershberger, W9GR's paper here: - http://www.arrl.org/files/file/QEX_Next_Issue/2014/Nov-Dec_2014/Hershberger_QEX_11_14.pdf
Hans, from QRP Labs, is getting very close to releasing firmware that will add (CE)SSB to the QMX and the QMX+. These are amazing QRP radios in a small form-factor, and getting better with each software release.
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