Winlink RMS Gateway AD6DM-10 is up, and serving the ham community.

After collecting parts of this system for a few weeks, it is operational on 145.630 MHz in CM98hj. It is comprised of:

Software running the gateway are:

  • UZ7HO Soundmodem, software TNC that provides PTT and AGWPE connectivity to other software
  • RMS Packet from
  • RMS Relay for CMS forwarding
  • VARA FM (registered) to provide faster communications than traditional packet.

This endeavor was started at Pacificon when I attended the Walnut Creek CERT demo of “Building Blocks of Winlink Gateways” on Saturday 10/16/2021. It lit a fire in my mind that needed to be implemented. I followed the configuration that WC CERT uses, and began researching the other aspects of gateway configuration.

Unfortunately, the documentation is not very clear or easily accessible. I had to go to many different sources, and asked people directly via email how things should work. After a few conversations and lots of YouTube videos, I finally came up with a general understanding of how to get a gateway going. From frequency coordination, to sound card audio level adjustments, to applying to be a Winlink RMS Sysop, to configuring the several different applications, it was an interesting ride.

A non-branded mini-PC windows computer
A non-branded mini-PC windows computer

Most of that time was spent waiting for the right Windows PC to arrive. I spent most of the effort trying to get a Stick PC to work, but its USB ports (only one needed for the external sound card) would not work properly. Even adding a powered USB Hub, I was unable to get the OS to communicate with the sound card. So I went with a “tiny cube” PC and that worked a lot better. But it involved a week and a half of waiting around and just reading articles on Winlink.

Now my station is up and beaconing its presence to the surrounding network. I was not able to connect to other VARA FM stations during the waiting weeks, so that made me think perhaps others in my area are also unsuccessful at using this very efficient and speedy mode. I received a lot of advice to put a Raspberry Pi station up, but Pi does not support VARA, and I wanted to move forward from traditional packet and support the much faster speeds capable in VHF digital radio. By having this station up, I hope to fill a gap in coverage for the valley area where I live.

To my delight, I found that despite my faster baud focus, traditional packet signals are copied and transmitted just as good. So my station is backwards compatible to those who wish to stay on trad 1200bps packet.

Alinco DR-135T and DRA-50 sound card Main screen of the RMS software

Now to wait for people to use it. I find it a bit of cheating to use my WoAD Android tablet with D74 connecting to my own gateway 20 ft away just to check Winlink mail (don’t we hams make comms more complicated? Just mention hotspots to the muggles haha).

It was a fun journey to get this station up. Now to harden it, clean up the cable clutter, and give it a permanent home in my shack.

Send me Winlink email!

4 Replies to “AD6DM-10 VHF Winlink RMS Gateway is on the Air”

  1. I have the same hardware and just starting the setup and config. Would you mind sharing screenshots of the soundmodem, rms packet and vara setup screens? Also, would you mind telling me your DRA-50 jumper settings?

    1. Soundmodem needs PTT.DLL to work as EXT PTT. Once you have that, just select the sound card in Advanced Options for soundmodem to work with the DRA-50. My RMS packet config is unconventional, I use Direct KISS TNC instead of AGWPE as recommended by forums, just seems to work whereas I could not get AGWPE to work. This means I needed to configure TNC to talk to port 8100, which is enabled in Soundmodem Server setup. DRA-50 was not modified at all from when I unboxed it, and is set to 9600 baud jumpers. I did tweak the audio potentiometers to very low, almost all the way down. This audio setting will vary to each configuration. Sorry I cannot provide screenshots at this time because that would mean stopping the system. I used this link to help me on my way:

  2. Just got my Packet/Winlink system setup and was able to connect to your gateway and send/receive email. Figured I would do a quick search to see who AD6DM was and found this write up! Thanks for taking the time to put the gateway up. We are in the same grid, so the radio waves aren’t going far, but they’re working. 🙂
    Rob (N3RP)

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