Sounds like a weak battery or the transmitter was stuck on transmit.
I'm hoping the former.The battery I used was unopened but had been my draw for a long, long time.

Can you check the amps when "not in use" ?
Tricky and I guess I'll need a new battery which I don't have right now. I guess try a new battery.

I read in the TX pdf that the TX output power can be set and adjusted via different resistor values set on a pin. This might be a way of increasing the transmit range (at the cost of battery power/life I guess).

Here's (another) project I'd like to do next Spring (gives me time to learn how to do this). Most Years we have birds use a nesting box in our apple tree. When the young hatch, the parents are really busy bringing in food. I'd like to:

1/ Have a beam set across the entrance whole to the nest box.

2/ When the beam is broken (parent bring in food) a counter is incremented and stored.

3/ Set a Light_Dependant_Resistor up so that when night falls the days DATA is rfpic'ed back to the RX module and displayed on the Serial Communicator.

LEDave, so many projects, too little knowledge.