[FCARC] Why the LSB/USB conventions in ham radio

[Adam T. Cately]

KB8ELG and I were on the repeater, discussing about radio conventions 
and such, and landed on wondering why the US military uses USB 
specifically - I'm still researching that, but here is an article I 
found that corroborates another set of posts that I had found, that 
state why the Amateur community uses LSB up to 20m, and USB on 20 and above.

Back into the 1950's and early 1960's, 75m was CW and AM phone, 40m was 
CW only, and 20m consisted of CW and AM phone.  When SSB was introduced, 
this article explains maybe why the Upper/Lower distinction became the 
standard.

http://n4trb.com/AmateurRadio/Why%20The%20Sideband%20Convention%20-%20formatted.pdf

If you're interested in Amateur Radio history, you can check it out.

As soon as I find more on the military/USB only distinction I will 
elaborate here again.


73 de KB8MDF