May I suggest that you consider just keeping your 9C for the older models with the 72MHz band rx's, it's not worth a whole lot right now if you were to try and sell it, Then buy yourself a new Spektrum tx, they are quite reasonably priced and you will be amazed at how much different the model will feel on the new radio. The 9C has a number of issues not the least of which is the elevator lag. This is caused by the radio selecting channel 9 as the second elevator channel and since signals are sent sequenctially, there is a huge lag on the left side elevator.
Having to run in the PPM mode for the module to work, has a few other issues not the least of which is that it cannot run in the currently used DSMX RF protocol.