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- Q65 is a digital protocol designed for minimal two-way QSOs over difficult propagation paths12. It uses a 65-tone frequency-shift keying modulation mode and is particularly effective for tropospheric scatter, rain scatter, ionospheric scatter, TEP, and EME on VHF and higher bands2. It has a sync tone for both time and frequency synchronization23.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.WSJT-X 2.4.0 introduces Q65, a digital protocol designed for minimal two-way QSOs over especially difficult propagation paths. On paths with Doppler spread more than a few Hz, the weak-signal performance of Q65 is the best among all WSJT-X modes.wsjt.sourceforge.io/Q65_Quick_Start.pdfWhat is Q65? Q65 uses a 65-tone frequency-shift keying modulation mode. It has a sync tone for both time and frequency synchronization. Q65 is particularly effective for tropospheric scatter, rain scatter, ionospheric scatter, TEP, and EME on VHF and higher bands, as well as other fast-fading signals.k5nd.net/2023/03/wsjt-x-and-the-q65-mode-for-6-m…The new protocol uses 65-tone frequency-shift keying and builds on the demonstrated weak-signal strengths of QRA64, introduced in 2016. User messages and sequencing are identical to those in FT4, FT8, FST4, and MSK144. Q65 employs a “unique tone” to sync time and frequency.www.arrl.org/news/wsjt-x-2-4-0-introduces-new-digi…
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