What is the difference between the DME-42 -001 and -003 versions?
The Collins DME-42 is a 3 channel DME receiving. For the -001 version, Channel 1 is capable of 2-out-of 5 tuning (2x5) while Channels 2,3 are capable of CSDB tuning. For the -003 version, all 3 channels are capable of either 2x5 or CSDB tuning.