Aren't "chunk Loader" Upgrade Supposed To Also Be "wireless"

I had a setup in FTB Ultimate whereby my Tutle (Mining + Chunk Loader) was controlled via a computer communicating over rednet.

Now in FTB Unleashed when I try: rednet.open("right")… i get: No moden on right side.
(for good measure I tried the other side, but same result … and since it's the same script i'm running, I would have expected the same result)

Had something changed ?

You should ask the peripheral developer (miscperipherals?, CC doesn't have chunk loaders), but the way peripherals work in turtles doesn't allow to have 2 peripherals, so you can't have a modem and the chunk loader (again, ask the peripheral developer, he will provide a more accurate answer).

RichardG's MiscPeripheral chunkloaders are no longer modems due to the fact it broke Dan's API rules, as far as I'm aware.

Yea, chunkloaders use to be modems too, but no more. This makes things more difficult, but I guess you can just place a chunk loader where they will be mining.