AAh : AA is the value, h represent Hexadecimal.

SEROUT pin, baud, [$AA,$AA,$AA,$AA,$AA, YouDataVariable]
OR
SEROUT2 pin,baud,[REP $AA\5,YourDataVariable]

Anything from Linx, Laipac, RFSolution, Maxstream will work without too much adjustment, but the manchester protocol have to be use in most case.

Sometimes just by sending some $AA, a header, your variables may work good. If you don't have many data to sent, i don't think Manchester is really needed.

Transmitter
SEROUT2 ...[REP $AA\5,"READY", YourVariable]

Receiver
SERIN2 ...[WAIT("READY),YourVariable]