Yes, but...They will be set up as an unintelligent serial link and will have to control their own buffers with a bit less than optimal results. For instance If you just want to send a small amount of data, they will have to time out and send less than a whole buffer full.In the past, I have used some similar stuff on 433 because it was very cheap. It worked, but was slower. I would probably not recommend that you use it for control (just telemetry).New old stock that apparently came from now defunct OpenPilot store. I have bought many from here and they are good. You can buy 4 before USA shipping starts getting expensive. I don't know about Australia shipping...https://sasquatchlabs.org/product/genuine-oplink-mini-modem/
You need to have a flight battery plugged in to your BEC/ESC for power to come out MainPort or FlexiPort, etc.I tried Sasquatch Labs and had trouble with the cart. I sent an email to KF@SL, Will post if I hear back.
As an alternative supplier for a good OpLink Mini, I bought mine from BangGood. Cheap as chips, and works perfectly with my Revo. Only thing you will need to do is flash it with the latest firmware from GCS when you connect it to your pc/laptop for the first time.https://www.banggood.com/OpenPilot-OPLINK-MINI-CC3D-REVO-Universal-Transceiver-TX-RX-Module-Integrating-Remote-Controller-p-1000081.html
USB power does not come out MainPort or Flexi* so you must plug in flight power to power things from these.The connector is "jst-sh 1.0" (1.0mm). Various kinds can be bought in many places.When connecting OpLink to an FC you need jst-sh on both ends of cable, and Txd/Rxd must be crossed to connect to Rxd/Txd at the other end. Magnifying glass. Lift tiny tiny connector flap just enough to slide pin out from Txd and Rxd on one side. Plug the pins back in the other way.