[greggold]

I use a adapter in my trainer wing to run two servos, only time I've used it. I think its for flight controllers.
S-port is great in that you can conect it to a blheli-32 and know a bit more.
Here is a basic FRsky RX with both-  https://www.aliexpress.com/item/10050050...2709%21btf&_t=pvid:831238e5-9455-49da-a8f2-d02b05406f6d&afTraceInfo=1005005011245102__pc__pcBridgePPC__xxxxxx__1680934582&spm=a2g0o.ppclist.product.mainProduct

srl

I have a Frsky R9 Slim +OTA rx that uses s.port to connect to a PWM adapter. This uses an ACCESS protocol, but there is also a ACCST version, FrSky R9 Slim that looks very similar, although may not be still readily available.
The Frsky Access R9 requires a Frsky tx such as the Tandem X20.

For my R9 Slim +OTA rx I purchased an adapter for PWM servo plugs
"Receiver Adapter For Crossfire Nano RX/ FrSky R9 Slim/ Slim+ Receiver PWM Signal Output For Flap switch, LED light Switch Plane
2 PCS AU $15.01 from Top Gun at Ali Express  Feb 26"
I have not got around to using this rx yet, I like how small and light it is but I have reservations about the ultra-fine wiring set on the adapter (what if one micro-wire snaps?), and also I have a niggling doubt on the quality of the adapter plug that fits in the rx (see photo of R9 and adapter).