five by five?

[dseagrav]

I thought that you could also include the last number on voice transmissions.

Then again, it's been 5+ years since I've picked up a ham radio, so my info is most definitely a bit "stale."

Tone purity doesn't apply to voice, because that's determined by the recieving radio. Offing the frequency for SSB corrects tone, using the tone knob works for everything else.