hello
More or less YES
for the beginning I would have a message like
"CQ CQ de xxxxx k k"
Two solution :
1/ the guy has PBP and modify the program to enter
"CQ CQ de F1CHF k k"
compile and program the PIC .... OK
2/ the guy didn't have PBP but a PC with Hyperterminal (for example)
I have a port to receive his new sentence
he will send a sentence like this "** CQ CQ de ABCDFE k k **"
not "2B 2B 66 78 etc ..."
I will save it in EEPROM

OK ?
thanks you