"single side band" is a term used to describe the modulation HAM radio operators typically employ.
LSB stands for Lower Side Band, while USB stands for Upper Side Band. Either of these are "single side band". So you take your target frequency, let's say 3.910MHz. A Lower Side Band signal at 3.910 would exist at and just to the left of 3.910, while a Upper Side Band signal at 3.910 would exist at and just to the right of 3.910. (www2.hawaii.edu) By convention, HAM operators typically choose to use LSB when operating at say less than 10MHz , and USB when operating 10-30MHz. So for example if you want to tune in to the nightly HAM operator chatter on 80 meters or 40 meters (~3.5 MHz or 7 MHz), you would scan using LSB.
"single side band" is a term used to describe the modulation HAM radio operators typically employ.
LSB stands for Lower Side Band, while USB stands for Upper Side Band. Either of these are "single side band". So you take your target frequency, let's say 3.910MHz. [A Lower Side Band signal at 3.910 would exist at and just to the left of 3.910, while a Upper Side Band signal at 3.910 would exist at and just to the right of 3.910. ](http://www2.hawaii.edu/~rtoyama/images/sideband.gif) By convention, HAM operators typically choose to use LSB when operating at say less than 10MHz , and USB when operating 10-30MHz. So for example if you want to tune in to the nightly HAM operator chatter on 80 meters or 40 meters (~3.5 MHz or 7 MHz), you would scan using LSB.
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