so ive been doing single op contests for a few years now, usually finish somewhere in the middle of the pack for my category, and ive been reading a lot about SO2R and how the serious contesters swear by it for rate. but every time I try to wrap my head around actually setting it up and operating it it just seems like an enormous amount of complexity for... what exactly? like my brain already feels like mush after hour 20 of a 48 hour contest, adding a second radio and all the switching logic seems like a recipe for me making more mistakes not fewer.

for context I'm running a K3 right now and have a spare TS-590 sitting around that I could theoretically use as the second radio. the antenna situation is manageable i think, i have a 2el yagi on 20 and a dipole on 40 so there's some separation there. what I'm really asking is at what point does the rate gain from SO2R actually become noticeable vs the overhead of managing two radios. is there like a contacts/hour threshold where it starts to make sense

honestly the rate thing is real but people oversell how seamless it is when you're starting out. the first contest i tried SO2R i probably made it worse because i was spending mental energy on the second radio instead of working the pile on the first one. the real gain comes from using radio 2 to find your next CQ frequency or grab a multiplier while youre in a slow period on radio 1, not trying to literally work two stations at the same time which is where people get themselves into trouble.

with a K3 and 590 you actually have a decent setup for it. the interlocking and audio routing is the part that'll take you a weekend to sort out before you even think about a contest. N1MM has the SO2R stuff built in pretty well now but you need to spend some real time with the config. i'd say try it on a shorter contest first, like a state QSO party or something low stakes, before you throw yourself into SS or CQ WW with it. the contacts per hour improvement is real once its muscle memory but it doesn't happen in your first attempt

the K3 pairs really well with another radio if you handle the audio routing right. a lot of guys use the microHAM stuff for the switching but you can do it cheaper with some careful wiring and the bandpass filters matter a lot if your antennas are anywhere near each other. the 20m yagi and 40m dipole should give you decent enough isolation to experiment without blowing anything up at least.

i'll be honest though i operate SO2R and i still have contests where i wonder if i wouldve done better just focusing on one radio and running cleaner. its not a magic fix, its just another tool. rate optimization in a contest is like 70% knowing when to S&P vs run and when to switch bands, the second radio just gives you more options for doing that. if your rate is already decent you might get 10-15% improvement once you're comfortable with it. if your rate is low because of other reasons SO2R wont fix that