Vespa is right with the exception of the R7008SB. It can be configured to run ch1-8 on one rx and another can be configured to run 9-16 in PWM/conventional channel port.
The manual tells how to set the Rx to "B"mode to set channels for S.bus.
But it should only be a firmware upgrade away from enabling the ports on PWM.....Think about it. Only reason they're not doing it is a marketing reason.
The R6308SBT Rx is also able to couple to a second unit to enable 14 channels (with radio subject of this thread) for FASST/FASSTest hybrids. Still no word on those in the world outside of Robbe.de though.
"Receiver R6308SBT FASST-Telemetry - Product description
Compact, lightweight 2.4 GHz FASST receiver with integral FASSTest telemetry transmitter, for transmitting model data back to the ground.
In spite of its small size the R6308SBT receiver features an integral FASSTest telemetry transmitter and can transmit a maximum of 32 telemetry data sets to the ground over a range of up to 1000 meters (3200ft).
Any existing FASST system can be converted to telemetry operation at any time by using an R6308SBT 2.4GHz FASST telemetry receiver.
Naturally the receiver is fitted with eight PWM outputs for conventional servos. The PWM outputs are switchable, so electively the channels 1 to 8 or 9 to 16 are available. Two receivers can be operated in parallel to provide sixteen PWM channels.
Channel 8 can be switched to S.Bus mode, so up to eighteen S.Bus servos or other devices can be connected to this output.
Devices or sensors can be connected via the S.Bus2 socket, and up to 32 telemetry data sets can be transmitted. If two receivers are employed, the number of telemetry channels rises to 64.
The receiver's integral transmitter sends telemetry data present at the S.Bus2 socket to the Telemetry-Box 2.4 GHz FASSTest (Item no. RF1666) by radio. The data are then displayed on the screen, or generated in the form of audible or speech output.
If a separate Wi-Fi Rx-Box 2.4 GHz FASSTest (Item no. RF1667) with integral FASSTest receiver module is used, the telemetry data can also or alternatively be transmitted to a smart-phone (Android, Apple), netbook, laptop, etc., and any monitor connected to that device."