so ive been doing single op for a few years now and my rates are decent but i keep watching the top scores and wondering how much of that gap is just SO2R vs actual skill. like i know the top guys are also just better operators but the second radio thing has to be a significant chunk of it right?

my current setup is a k3 and i have an older ts-590 sitting on the shelf doing nothing. antenna situation is two yagis on the tower which is actually not terrible for trying this i think, the feedlines are already separate. my main worry is the intermod situation between the two radios when theyre both transmitting. ive heard horror stories about guys blowing up preamps or just getting so much garbage on the second receiver that its useless anyway.

is there a minimum filter investment before this is even viable or am i going to spend more on bandpass filters than the whole thing is worth? and does the SO2R actually translate to rate improvement for someone whos not already a top 10 operator or is it kind of wasted until you have the operating fundamentals so dialed in that the second radio is the actual bottleneck

the filter question is real and dont skimp on it. 4o3a or dunestar bandpass filters are the standard answer and yeah theyre not cheap but you will absolutely fry something or just have an unusable second receiver without them if the antennas are anywhere near each other. i ran without them once during a sprint just testing and the noise floor on the second radio was a disaster even with the yagis pointed different directions.

on the rate question though, honestly the improvement depends a lot on where your operating is right now. if youre already running a pile and keeping the rate up, SO2R lets you use the dead time between CQs to hunt multipliers on radio 2, which is where a lot of the score differential comes from — its not always pure QSO rate, its the mults you snag without stopping your run frequency. if youre still at the stage where managing one radio during a run takes real concentration then adding a second one is going to hurt more than help. id say get a full contest season of solid single radio contesting where running feels almost automatic before you add the complexity.

the k3 and 590 combo is actually not bad for starting out with this, k3 has pretty good roofing filters so it holds up reasonably well as the run radio. one thing people dont talk about enough is the SO2R controller situation — you need something to handle the antenna switching and PTT interlocking so you dont transmit on both at the same time, that scenario is bad news. microham makes stuff for this, there are also some cheaper options people have built. the interlocking is not optional.

i started SO2R maybe three years ago and my scores jumped more than i expected even though i felt pretty clumsy with it for the first several contests. the muscle memory takes a while. i basically lost rate for the first two contests while i was figuring out the workflow and then it started clicking. give yourself a few low-pressure contests to just practice the technique before you try to optimize for score.