Take a look at my web page. There are a few articles there that you should find useful. Trying to control an LED without capturing/decoding the RF signal is problematic - depending on the type of RF receiver (e.g. superheterodyne or superregenerative) the output may be extremely noisy, meaning your LED would be on at all times. Read through a few articles there and then you should be able to formulate a more specific question. BTW, only a few RF remote codes use manchester coding - most are OOK.