so ive been thinking about this for a while now and i can't decide if SO2R is actually worth the setup headache for someone like me who only does maybe 4-5 contests a year seriously. i run a K3 as my main radio and ive got an old TS-570 sitting in the corner doing nothing and i keep reading about guys using two radios to keep their rate up while they're listening on the run frequency but honestly my station is not really set up for it — single amp, antennas that would probably interact badly, and i'd need a bunch of band pass filters before any of this made sense.

what i really want to know is whether the rate improvement is noticeable enough to justify the learning curve. ive done SS and CQWW single op and my rates are decent-ish for my location but i always feel like i'm losing time when i'm searching for mults during a slow period. like is that the actual use case everyone's talking about, running on one radio while S&P-ing for mults on the other? or am i misunderstanding the whole thing

also curious how people handle the SO2R legality question in different contests since i know some of them have explicit rules about it now

yeah the mult hunting while running is basically the whole point, you've got it right. when your run frequency is cooking and you don't want to leave it but there's a juicy mult on 15 that's going to fade in an hour, that's where SO2R earns its keep. without it you're basically gambling on whether to abandon the rate or miss the mult.

that said, the filter situation is not optional. i tried running without proper bandpass filters once — just to see — and it was a disaster. the K3 handled it better than i expected but the audio bleed was still bad enough that i couldn't copy anything on radio 2 while transmitting on radio 1. W3NQN filters are what most people use, or the Array Solutions stuff. it's an investment but if you've already got two decent radios it's the obvious next step.

the rules question is worth checking per-contest but most of the major ones allow it for single op unrestricted now. ARRL SS is fine, CQWW is fine. some of the smaller sprints get weird about it so just read the fine print before you start wiring things up.

honestly for 4-5 contests a year i might not bother with full SO2R unless you just enjoy the tinkering side of it. the real gains come if you're doing a 48 hour effort and optimizing every hour of it. for a casual SS or something where you're putting in maybe 12-15 hours the complexity might cost you more than it saves while you're still figuring it out.

what actually helped my rate way more before i ever went SO2R was just getting disciplined about when to run vs when to S&P and not being precious about abandoning a dead frequency. like if you've called CQ 10 times and got nothing, move. sounds obvious but i wasted so much time just hoping the band would come back to me. also logging software integration — if your N1MM setup isn't fully dialed in with the radio that's probably costing you more time than a second radio would save