so i just upgraded to general last month and im trying to figure out where i can actually operate on 40 meters. i know there are parts of the band i wasnt allowed on as a tech but now im confused because ive been looking at different band plans and they dont all say the same thing. like the arrl chart shows one thing and then i see other charts online that look different and i cant tell if those are just suggestions or actual law or what.

also someone at my club mentioned something about staying away from the band edges and i didnt really understand why. like if my license says i can go down to 7.025 or whatever, why wouldnt i just operate right there if thats where my privileges start? is this an fcc thing or just a courtesy thing people do?

sorry if this is a dumb question, ive been searching around and getting more confused the longer i look

not a dumb question at all, this trips up a lot of new generals. so the short version is: the FCC part 97 rules are the actual legal limits, and the ARRL band plan is kind of a gentlemens agreement on top of that about what modes go where within your privileges. so like you might be legally allowed to transmit somewhere but by convention cw ops use the bottom chunk and phone starts higher up. you dont have to follow the band plan but people will probably tell you to move if you set up ssb down in the cw portion.

the band edge thing is a real practical concern. your radio isnt perfect and neither is your signal -- if you're transmitting right at 7.125 or wherever your lower limit is, your sidebands can actually spill outside your authorized spectrum depending on how your rig is set up. most people stay at least a few khz inside the edge just to be safe. how much depends on your rig and what mode you're running but 3-5 khz is a common rule of thumb for ssb. some contesters cut it pretty close but they usually know exactly what their radio is doing.

yeah what he said. also worth knowing that 40m is kind of a mess in terms of different regions of the world having different allocations so if you're working dx you might hear stations operating in parts of the band that would be outside your privileges or at least outside the US allocation. that can be confusing at first. i remember being totally lost about why some european stations were showing up below where i thought the band started.