/diy/ - Do It Yourself

So gents, I guess most of you know these 433MHz RF links. I am trying to create a wireless blinky using these. It's pretty simple and all if I do it the convention way of two microcontrollers, one at the receiver end, one at the transmitter. But I am planning on doing it differently.
What if there's only a microcontroller on the transmitter end, and on the receiver end, there's a band pass filter (of a particular band that it allows). Wouldn't the band pass filter allow only the signal from the transmitter to pass assuming they have the same frequency?
I am not a professional, just a hobbyist. I've come to enjoy analogue part of electronics a lot more than expected