Hello Dustin,
Thank you for your reply and help.
So if I buy a 20 channel receiver could I access the 18 channels with my DX-18 or would I be better of with a 10 channel receiver with the x plus 8 module to get my 18 channels.
I do know that usually with a 12 channel receiver you will get the whole 12 channels on the DX-18 however if you connect the x plus 8 module than you would only get 10 channels + 8 channels from the x plus module giving you 18 channels.