RE: Pos shift receiver ?
The simple answer is no. Futaba and Hitec are neg. shift, JR and Airtronics are positive shift. hitec also made receivers for jr and airtronics radios that were pos. shift. I also believe that hitec made a module for their module based radios that let you select the shift (along with channel); and DAD (out of business) made rx's that would accept both the signals from positive or negative shift transmitters.