It's my understanding that FM is used for UHF, VHF, and SSB is generally reserved for other bands.
From my understanding,
- better audio quality when reception is good
- more efficient (can transmit farther with the same amount of power as fm or the same distance as fm with less power)\
- more understandable when the quality is low
Are there other, more efficient audio modes other than the most common two?
If my above understanding is correct, why aren't there any SSB HT's that operate in the UHF or VHF range, especially considering that efficiency is so important for battery life?