so ive been trying to get winlink working properly for a few weeks now and im pulling my hair out a bit. setup is a kenwood ts-590sg into a signalink usb, running vara HF. i can connect to the RMS gateway fine, session starts, starts pulling down the messages and then just... drops. sometimes at like 30% sometimes it'll get to 80% before it craps out. the gateway im hitting is about 400 miles away which i didnt think was too far for 40m during the evening.

i checked the signalink levels and i dont think im overdriving it, the waterfall looks clean. ALC is barely moving. i set up the winlink express client fresh last week thinking maybe i had a corrupted install but same behavior. my question is basically is this a propagation thing or is there something about how RMS sessions work that im missing -- like does the gateway have a timeout that im hitting, or could it be my RF path is marginal and VARA is just giving up. any ideas appreciated.

yeah this drove me crazy for a while too. couple things to check -- first, vara HF has that SNR display in the bottom of the window, what's it showing when you connect? if youre seeing anything below like 10-12db you're gonna have a rough time maintaining the session especially if propagation shifts even a little during the transfer. 400 miles on 40m in the evening can be weird depending on where you are, sometimes the skip is working against you more than for you.

second thing id look at is whether youre using vara FM or vara HF because i've seen people mix those up and get flaky behavior. also worth trying a gateway thats physically closer if you can find one on the gateway list, sometimes closer isn't actually better SNR wise but it often is. the RMS does have a session timeout i believe its around 10 minutes of inactivity but if youre actively transferring you shouldnt be hitting that. i'd lean toward marginal path personally just based on what you're describing.

check your ptt delay settings in vara. if the radio isnt fully keyed before vara starts sending data you get garbage at the beginning of each transmission and the gateway might just give up. i had something similar with my ic-7300 and had to bump the ptt delay up to like 150ms before it stopped doing weird stuff mid-session. also make sure windows power management isnt putting the usb port to sleep, that one got me bad on a laptop setup.