ok so i passed my general a few months ago and ive been trying to figure out exactly where i can operate on 40 meters. i keep reading about the band plan but then i also see stuff about band edges and everyone online seems to have a different opinion about how close you can get to them.

like i know the general class starts at 7.175 for phone but then someone at my club said to never transmit within like 3 khz of the band edge because of sideband splatter or something? and then i read somewhere that 7.125 to 7.175 is a gray area or shared with extra class or something. im honestly just confused about what the actual rules are vs what are just gentlemens agreements that people follow.

can anyone explain this in a way that makes sense because the FCC part 97 language is kinda hard to parse

yeah this trips up a lot of new generals. so the actual FCC allocation for general on 40m phone is 7.175 to 7.300, thats the legal limit and thats what part 97 says. anything below 7.175 on phone is extra class only, so stay above that line.

the band edge thing your club guy mentioned is real practical advice though. when youre running USB your signal actually extends a few khz above your dial frequency, so if your rig says 7.298 youre probably putting signal all the way up to 7.301 or so which would be outside the US allocation entirely. most experienced guys try to keep at least 3 khz inside the edge just to be safe, not because the rules require it but because your filter rolloff isnt a cliff, its more like a slope.

the band plan stuff like RTTY segments and the dx window around 7.175 to 7.200 are just gentlemens agreements. the ARRL publishes a recommended band plan but none of it has the force of law, its just what most people try to follow so things dont get chaotic. if you operate right at 7.175 youre legal as a general but youll probably get some grumbling from the dx crowd who treat that as their territory.

same thing happened to me when i got my general lol. one thing i'll add is that the FCC rules are the floor not the ceiling, so you can always be more conservative than required. i just kind of defaulted to hanging out around 7.200 to 7.250 for regular ragchewing and ive never had any issues. the bottom of the general segment near 7.175 does get a bit chaotic with the dx pile ups and people running the edges so honestly its easier to just go a bit higher anyway