Thank you. I made the change. In the comment above I put a link to the best demonstration of your point B. I though about your third point, but I wanted to make sure I completely isolated my circuit from the radio keying.
Thank you. I made the change. The link was helpful. I also found a great demonstration of why they're important here:
It's in line 78 of the code.
Thank you, and that's a good question. It usually does work fine w/o them, but in actual use, radio interference (not just from radios, but nearby motors & switches) can sometimes cause very brief pulses of current, which can accidentally trigger the timer on or off--making it inaccurate.
I use them as a preventative measure, and because I originally learned about the phototransistor from here: http://learn.parallax.com/tutorials/robot/shield-bot/robotics-board-education-shield-arduino/chapter-6-light-sensitive-8
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