[quote author=Coding Badly link=topic=98261.msg737269#msg737269 date=1332655362]
Using the internal oscillator obviously eliminates the crystal / resonator. However, the internal oscillator is not tuned. How accurate does the clock need to be? Are you prepared to tune it? Does the voltage vary? Or the temperature?
[/quote] I read up more about the Internal Oscillator, and decided against it 
It's too situation specific. I'd eventually like to get this out so that more people would be willing to make it for their transmitters, so simplicity is a must.
It is powered through a 3.3v regulator, from a battery.