Oh, okay. I've not done any real data transfer over HF, so I wasn't aware of that. I know all the voice traffic on less than 10 MHz runs on LSB.
Discussion
Yeah. Most all data, whether try, winlink, ft8, js8 call, etc... all run on USB.
With most cw down there on LSB and voice on LSB, it may help increase band space availability. Unsure.
If note, if you have 2 handhelds with data / packet access, you can test and run HAMSTR on VHF just fine on 1200 baud.
Ice used a digirig and baofengs, Bluetooth tnc on a uv pro, sound card connections, and mobilelinkd tnc v3 as different types. Mix and match works fine as long as your protocols line up, ie: 1200 Baud AFSK
It does help bandspace availability. If you were on AM, it would be using both the upper and the lower side bands, so you'd only be able to do one thing at a time where, by using both upper and lower for separate things, two people could be on the same frequency and be using it for two different purposes without interfering with each other.
Mind you, the receiver has to be very accurate about being able to measure the side bands, otherwise you could have bleed over. I'm assuming the old tube radios would have problems with it versus today's crystal oscillators and such.
Very true! My newer yeasu ft710 is on the money, virtually no bleed even at 100 watts