Those Rx's won't work with a PCM transmitter. The DCX is a dual Conversion FM Rx, and would require you to get the FM Tx module for your radio and the DCX Xtals. THe 555 is an Aircraft Rx and wouldn't work for you either I'm afraid. Sorry we couldn't help a bit more. If you have any other ?? fell free to ask tho. TTYL.
Gary F.