Well, I never had time to edit the file so can't be 100% sure if it's going to work but.... As far as I can see you are missing some parameters. You must set option for each parameter in order as given in the example: protocol, network ID, site number, OTA channel number, TX frequency, RX frequency, sort order. Counting from left to right you set only 5 parameters out of 7. Or in ohter words you set only first 5 parameters.
protocol=NEXEDGE48
network ID=0
site number=0
OTA channel number=460.587500
TX frequency=1
As you can see the last two lines contain wrong values. I'm not sure how to find the unknown values (some of them can be seen in even log window) but if we say that all uknown values can be set to 0 it sould look something like this
protocol=NEXEDGE48
network ID=0
site number=0
OTA channel number=0
TX frequency=460.587500 (if you are sure this is TX and not RX frequency)
RX frequency=460.587500 (just for example)
sort order=1
So your furst line is going to look something like this:
NEXEDGE48, 0, 0, 0, 460.587500, 460.587500, 1
Try it and let us know if this works