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Single-sideband modulation
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== Extended single sideband (eSSB) == Extended single sideband is any [[J3E]] (SSB-SC) mode that exceeds the audio bandwidth of standard or traditional 2.9 kHz SSB J3E modes (ITU 2K90J3E) to support higher-quality sound. {| class="wikitable" |- ! Extended SSB modes !! Bandwidth !! Frequency response !! ITU Designator |- | eSSB (Narrow-1a) || 3 kHz || 100 Hz ~ 3.10 kHz || 3K00J3E |- | eSSB (Narrow-1b) || 3 kHz || 50 Hz ~ 3.05 kHz || 3K00J3E |- | eSSB (Narrow-2) || 3.5 kHz || 50 Hz ~ 3.55 kHz || 3K50J3E |- | eSSB (Medium-1) || 4 kHz || 50 Hz ~ 4.05 kHz || 4K00J3E |- | eSSB (Medium-2) || 4.5 kHz || 50 Hz ~ 4.55 kHz || 4K50J3E |- | eSSB (Wide-1) || 5 kHz || 50 Hz ~ 5.05 kHz || 5K00J3E |- | eSSB (Wide-2) || 6 kHz || 50 Hz ~ 6.05 kHz || 6K00J3E |}
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