ok so i just upgraded to general last month and im trying to figure out where i can actually transmit on 40 meters. i looked up the band plan but honestly its kind of confusing because there's the FCC allocations and then theres the ARRL band plan and they dont seem to be exactly the same thing? like one says i can go down to 7.025 but then i see people talking about staying away from the band edges and i dont really understand why that is

also is the band edge thing a legal issue or just a courtesy thing? i dont want to accidentally operate outside my privileges but i also dont fully understand how close to 7.125 or whatever the edge is i can actually get. my rig shows the carrier frequency i think but someone told me i need to account for the sideband when im on SSB which i hadnt even thought about

yeah the sideband thing is the part that trips up a lot of new generals. on LSB your actual transmitted signal extends several kHz below your dial frequency, so if your radio says 7.125 and thats the lower edge of your general phone privs, your signal is actually splashing down into the extra/tech CW portion below that. the rule is you need to keep your entire signal within your allocated frequencies, not just the carrier.

so in practice most people stay at least 3 kHz inside the band edge just to be safe. its not just courtesy, the FCC regs say your emission has to be within the band, so transmitting at exactly the edge with a wide SSB signal is technically a violation even if your dial reads the right number. the ARRL band plan is voluntary but the part class license privileges are the actual legal limit.

i had the same confusion when i upgraded lol. what finally made it click for me was someone explaining that the frequency on your display is just where the suppressed carrier would be, not where your voice is actually going. so on 40m LSB your voice audio kind of hangs below that number. took me an embarrasingly long time to really get that