I'll just follow my labels on my circuit boards. It's just that last night I tried it and found out the transmit code hangs right before initializing the Tx unit.
The two data pins on those cheapo RX units are connected - you can see the trace if you look carefully at the board, so it doesn't matter which you pick.
Various TX units have different pinouts (some RX units do too). Be sure to use the pinout marked on the board.
Also, those TX/RX units (particularly the RX ones) are garbage, if they're the ones I'm thinking of (receiver with no crystal on it, transmitter with that round silvery thing in the middle). The SYN470/480-based receivers (about $1-2 each on ebay - I use the narrow yellow ones) are superhet (note how they've got a crystal!), and get much better range; the SYN115-based transmitters are likewise better than the cheapo ones. The SYN115/4x0 transmitters and receivers are much better, and not that much more expensive than the bottom of the barrel ones you're (I think) using.
It's just amazing what a large scale that one transmitter board gets made on... with the same backwards "DATA" (and it's backwards, not mirrored, which is an easier mistake to make - look at the D)
