no this is not a sideband radio, if you want sideband on a handheld there is pretty much only one option, the cherokee ah-100, magnum 1012, albrecht ae2990 and a few others, all pretty much the same radio.
ssb is just a method of transmission, same channels as the regular 40 although with just a regular CB radio, SSB transmissions will sound like donald duck, and be illegible. basically, SSB gets out alot further with less power, if you want to learn more
Single-sideband modulation - Wikipedia, the free encyclopedia
On the 75-822 and Cobra HH-45, the H and L channels are extra bands of 40 channels, the L is 40 more channels below channel 1, and the H is 40 channels above channel 40, it can also do 40 channels above the 40 channels above ch.1
so the regular US 40 channels are from 26.965-27.405 mhz, the H channels from 27.415 to 27.855 and then 27.865 to 28.305. The L channels are from 26.515 to 26.965.
The extra channels are actually pretty useless for a handheld.
Some truckers run below channel 1, and some DX in AM mode, but mostly spanish is all you hear.
Above channel 40 is almost entirely DX, in SSB mode. The HH-45 and 75-820 will only work on AM mode.
The only real advantage extra channels are to find a nice quite channel that most people with regular 40 channel radios cant go to.
Right now we are at the peak of the solar cycle, "skip" happens most every day. Good luck finding any quite channel, and on a bad day the noise that rolls in will drown the weak signal from the handheld radio out so bad you be lucky to get a mile range out of them.
After around 9 or 10 pm the skip goes away, might be useful if your batman.
Good time to sell it and buy a VHF or UHF walky talky if you want to get any real range.
Or hold on to it, some people might be figuring out the useless of a handheld CB radio during the peak of solar cycle, put it away for a few years until the sunspots die down then you have a nice radio with a 3 to 5 mile range.