So ive been messing with Winlink for a few weeks now and i think i have the basic concept down but the actual setup is giving me fits. Running Winlink Express on a Windows 10 box, got a Signalink USB hooked to my IC-7300, and im trying to connect through one of the local RMS gateways on 2m. The gateway shows up in the list and i can see it beacon but when i actually try to initiate a session it gets like halfway through the handshake and just drops. Sometimes it says "channel busy" and sometimes it just times out with no real error.

Ive gone through the Winlink Express settings probably four times and i cant figure out what im doing wrong. My audio levels look okay in the waterfall, the Signalink TX light comes on, but the session just doesnt complete. The gateway is only like 8 miles away so path shouldnt be the problem. Is there something with the Vara FM setup that im probably missing? i did update to the latest Vara FM version but maybe i configured something wrong in the modem settings. Any ideas before i give up and just go HF.

Couple things to check — first make sure your PTT is actually releasing fast enough after the initial transmission. The Signalink has that tail delay pot on the inside and if its set too long the gateway thinks the channel is still busy when you're actually done transmitting. Had this exact issue for two weeks before i figured it out. Also double check that your Vara FM is set to the right soundcard device, sometimes after a windows update it silently switches back to the default audio device and then everything looks fine on your end but the audio path is broken.

Also worth checking if someone else is actively using that gateway when you're trying to connect. The RMS gateways only handle one session at a time on VHF so if another station grabbed it first you're just gonna sit there and timeout. Try a few different times of day and see if the behavior changes.

yeah the tail delay thing is real, that got me too. but also — have you tried connecting to a telnet session first just to verify your Winlink account is set up right and your callsign/password combo works before you blame the RF path? i spent like three days chasing an RF problem that turned out to be i had a typo in my winlink password so the session was failing at the authentication step not the radio step. the error messages in Winlink Express are not exactly informative about which part of the sequence failed lol