On 14/08/2016 17:01, Bill Somerville wrote: > the fast modes are not phase and amplitude continuous like the slow > modes, this means that they have a varying modulation envelope and their > average power is lower than their maximum instantaneous power. This also > means that linear Tx stages are required in the same way they are for AM > modes compared to FM or CW modes which have no such requirement.
Hi George & all, the above is baloney! Sorry about that. All the WSJT-X modes use a continuous (as is possible) phase and constant amplitude modulation scheme. Any observed lowering of Tx power measurements with the fast modes, all else being equal, is probably due to the senders rig's Tx SSB filter shape or something before that being less than perfect. More research is needed into this phenomenon to be sure of the cause. One thing worth checking is that all "enhancements" are disabled on sound cards used for both Tx and Rx. The wider the bandwidth of the signal the more likely that such features might distort the true signal. 73 Bill G4WJS. ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://sdm.link/zohodev2dev _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
