ok so ive been licensed for about 3 months now and i keep getting confused about the 40 meter band. i know generals have phone privileges but i keep seeing different numbers thrown around and im honestly not sure where i can legally operate vs where i just shouldnt go because of conventions or whatever. like is there a difference between what the FCC says and what the band plan says? someone at the club meeting mentioned something about staying away from the band edges and i dont really understand why. is it just courtesy or is there actually a rule about it

also someone told me DX stations are usually down around 7.100 or so and if i transmit there ill cause problems but i couldnt get a clear answer on why exactly

yeah this trips up a lot of new generals. so the FCC allocation is what's actually legal — for 40m phone, generals can use 7.225 to 7.300 MHz in the US. below that is CW and data territory for generals, and extras get a bit more room starting at 7.125. the band plan on top of that is more like a gentlemans agreement, its not law but everyone kind of follows it to keep things from being a mess.

the band edge thing is real important though. if you're operating at say 7.300 and your signal has any sidebands or drift at all you could technically be out of band. for SSB your carrier is usually a few kHz below where your radio says you are depending on whether its USB or LSB, so people avoid parking right at the edge for that reason. give yourself a few kHz buffer and you'll be fine.

as for 7.100, thats a DX calling frequency that's used internationally even though the US allocation is a bit different there. US stations arent supposed to be doing phone that low so if you key up around there youre not just being rude, you might actually be out of your privileges depending on exactly where you are.

the band edge thing burned me when i first got my general too. i was so excited to finally get on phone that i just found a clear frequency around 7.298 and started calling CQ and someone came back to me and very politely said my audio was splattering past 7.300. never thought about it before but SSB takes up bandwidth, its not just one point on the dial

i use the ARRL band plan PDF now and just keep it open on my phone when im not sure. its not perfect but at least it gives you a starting point for where people actually expect to find different modes and activities