Quote Originally Posted by Dave View Post
You also have to put the digital representation of the tones thru a lowpass filter. Look in the manual for an example. I have used this command for generating tones for our 2 meter repeater and it works just fine...
Yes Dave, I knew this. I've read over that page 20 times, it would be nice for the wording to be clearer on the suitable clock speeds for it though. I've implemented that lowpass filter as suggested and it seems to work "ok", but analyzing the tones on my iphone "iAnalyzer" app suggests that the correct dual frequencies of each DTMF tone produced are more often than not the 2nd and 3rd most prominent frequency outputted unlike a proper specific purpose DTMF device, but they appear to work on 40MHz anyway, so... so long as it's reliable (which is critical to my application).

Thanks,

Troy