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Extended Single Side Band (eSSB) is any J3E SSB transmission that exceeds the audio bandwidth of standard or traditional 2.9kHz SSB J3E modes (ITU 2K90J3E), using increased bandwidth to support relative high fidelity, full range clean and articulate vocal audio.
At the next AREG meeting, Ivan VK5RS will introduce you to this interesting world of experimentation and will show why people are interested in eSSB and what is possible on the amateur radio bands. This should be fascinating indeed!
Amateur Radio Experimenters Group: https://www.areg.org.au/