I'm setting up a dual-mode RMS gateway using VARA FM and packet on a single radio per the NS7C document. Got both modes working individually but having collision issues when they run together. VARA FM pretty much hogs the channel 100% until the session completes, while packet users don't monitor first and just press connect.

Using UZ7HO Soundmodem with AGWPE driver as recommended. The KISS driver has timing issues with default RMS Packet settings causing collisions, while AGWPE doesn't have these problems. Should I implement separate frequencies or is there a better workaround?

VARA FM and packet definitely don't play well together on the same channel. I run mine on separate frequencies - 145.010 for packet and 145.030 for VARA FM. Much cleaner operation and users can actually complete sessions without getting stepped on.

Had the same issue until I read the part about starting Soundmodem before RMS Packet, with VARA FM started automatically by RMS Packet. Also critical to set proper delays in Windows task scheduler. Worth checking your power settings too - USB ports powering off can cause issues.

The WaveTalkers YouTube series covers this exact setup really well. They have a great video on dual mode packet/VARA FM RMS gateways with digipeater sections around 37-41 minutes. Saved me hours of troubleshooting when I was getting started.