This JR R600 receiver I inherited , I tried to set it up to a Neon Hitec FM 72 Mhz radio same channel #40 and it wont work at all , so next I removed the crystal and installed it into a different receiver, and the JR crystal in a different receiver worked with the Hitech radio so I tried the R600 JR receiver also to a Futaba radio set on PPM and it did not work , I know both of my radios are negative shift , so maybe the reason for not working is that the R600 JR receiver is a positive shift or could this JR receiver be a PCM modulation that don't match a PPM radio?