Good friend Rob Robinett (developer of wsprdaemon), along with leaders of the HamSCI Citizen Science Project, are at the American Geophysical Union (AGU) annual meeting in San Francisco, showing how WSPR is being used to study the behavior of the ionosphere.  One of the posters being exhibited features the WSPRSONDE-8   multi-channel transmitter currently in development at Turn Island Systems:

See more WSPRSONDE-8 information at TurnIslandSystems.com