Why is it that when I use MakeHex I get

Device Code: 19 Function: 120
0000 0073 0000 000B 0040 0020 0020 0040 0040 0020 0020 0040 0020 0020 0020 0020 0020 0020 0020 0020 0040 0020 0020 0020 0020 0CC4

Note then last four digits are different to your output.

Have I done something wrong?

This question has I'm sure been asked before. How do I know what to change this text to.

Device=19
Function=0..127
Define T=0

Protocol=RC5
Frequency=36000
Time Base=889 '888.89 = 32 cycles at 36Khz
Message Time=128 '128 times TimeBase
Zero=1,-1
One=-1,1
Prefix=1 'Officially -1,1 but starting with off is silly
First Bit=MSB
Form=;*,~F:1:6,T:1,D:5,F:6

Thanks Matt