so ive been licensed for about three years now mostly doing HF and some local 2m stuff, but ive been watching videos of people working SO-50 and some of the linear transponder birds and i finally decided to try it out this weekend. got a decent dual band HT and a arrow antenna and figured id give AO-73 a shot since everyone says its beginner friendly.

heres where im confused though — i understand the concept of the transponder being inverted, so USB on uplink becomes LSB on downlink or whatever, but when i actually try to tune while the bird is passing i just hear a mess. like i can hear signals but i cant figure out if im hearing myself or other stations. and the doppler correction thing is driving me crazy, do i need to be constantly retuning the whole time or is there some trick to it. im using gpredict on the laptop for tracking which seems fine but its a lot to manage between that and the radio and the antenna and trying not to fall over pointing at the sky

any advice from people who have actually done this would be great, im clearly missing something fundamental here

yeah the first few passes are pretty overwhelming, dont feel bad about it. the inverted transponder thing trips everyone up at first. what you want to do is set your uplink frequency and then tune your downlink to find your own signal — once you find yourself just keep adjusting the downlink for doppler and leave the uplink alone, or some people do it the other way around. either works really. the main thing is just pick one and be consistent during the pass.

for AO-73 specifically the passband is pretty narrow so small tuning increments matter a lot. and honestly the arrow antenna by hand is totally doable, i did it for like a year before i built anything fancier. you just get a feel for where the bird is after a few passes even without staring at gpredict the whole time. give it maybe 5 or 6 tries before you get too frustrated, the first couple passes are basically just learning what everything sounds like

one thing that helped me a ton when i started with the linear birds was to just listen for a whole pass without transmitting at all. like just hear what the band sounds like, find signals, see how the pitch shifts as it goes over. then next pass actually try working someone. jumping straight to transmitting when you dont know what youre supposed to be hearing just adds confusion on top of confusion. also gpredict is great but the az/el display is the part you actually want to look at not the map, at least when youre hand holding the yagi