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G2A09
Why do most amateur stations use lower sideband on the 160-, 75-, and 40-meter bands?
Pick an answer to check it.
Answer: D. It is commonly accepted amateur practice
There is no rule requiring LSB below 10 MHz; it is simply commonly accepted amateur practice. Using the same sideband as everyone else makes tuning easy.
Tip: LSB down low is custom, not law.