AmComm is a community digital voice network with a relaxed streak — and one genuinely clever trick. On the surface it’s a friendly DMR network. Underneath, it does something most networks don’t: it puts DMR operators and Yaesu Fusion operators in the same rooms, using a Yaesu repeater-linking system called IMRS that few hams ever encounter. This is a plain-language explanation of what AmComm is, and how it bridges the two modes.
AmComm (at amcomm.network) bills itself as the AmComm DMR / C4FM Network — a place to experiment and rag-chew without the bureaucracy. Its whole personality is a reaction to the more locked-down networks: no hotspot-security passwords, no talkgroup time limits, and talkgroups available on request. Bridging your system to other networks (AllStar, XLX, YSF, URF, and more) is welcomed rather than forbidden. Their stated rule, more or less, is “have fun.”
Getting on the DMR side is the familiar routine: obtain a DMR (CCS7) ID from radioid.net if you don’t already have one, point your hotspot or repeater at an AmComm server, and select a talkgroup. AmComm carries the usual worldwide and regional groups — for example a worldwide talkgroup (91) and a USA talkgroup (3100) — alongside a set of linked regional systems that become important in a moment. Because AmComm encourages bridging, its talkgroups also reach out to other networks and modes.
Here is what makes AmComm worth studying. To bring Yaesu Fusion into the fold, AmComm doesn’t rely on Wires-X or an ordinary YSF reflector. It uses IMRS — Yaesu’s Internet-linked Multi-site Repeater System, a native Yaesu technology that most operators have never touched.
IMRS links DR-2X repeaters (fitted with the optional LAN-01A board) directly to one another over the internet — up to 99 of them — with no PC, no HRI-200, and no hotspot required. The repeaters simply need an IP connection. Routing is done by DG-ID, with three flavors of linking: LOCAL (stay put, no linking), RPT GROUP (a one-way feed), and GROUP (a full two-way link).
Three ways to network Fusion
It’s worth keeping these straight. Wires-X needs an HRI-200 and a PC and connects to Wires-X Rooms. YSF / FCS / YCS reflectors are the open-source community route, usually via a Pi-Star hotspot. IMRS is Yaesu’s own repeater-to-repeater linking, built into the DR-2X with a LAN board — no computer in the path. AmComm runs an IMRS master server (and a YCS server for hotspot users), so Fusion traffic can arrive by either path.
The magic is in the mapping. AmComm ties each Fusion DG-ID to a specific DMR talkgroup, so the two mode-worlds pour into one shared room. Key up on the matching DG-ID from a Fusion radio, or the matching talkgroup from a DMR radio, and you’re in the same conversation. A few of the pairings:
AmComm maps each Fusion DG-ID to a DMR talkgroup, so the two modes land in one room.
For DMR: get a CCS7 ID, connect a hotspot or repeater to an AmComm server, and select a talkgroup. For Fusion: a club with a DR-2X and a LAN-01A board can join AmComm’s IMRS master directly; individual Fusion operators on hotspots can reach the same rooms through AmComm’s YCS server. Either way, the DG-ID / talkgroup pairing decides which shared room you land in.
The one-sentence version
AmComm is a relaxed community DMR network that unites DMR and Yaesu Fusion in the same rooms by mapping Fusion DG-IDs to DMR talkgroups — bridging the two modes through Yaesu’s native IMRS repeater linking rather than the usual Wires-X or YSF paths.
For the Fusion features this builds on, see How C4FM (Fusion) Works and How a C4FM Repeater Works; for the reflector side, Understanding YSF, YCS, and FCS Reflectors; and for the DMR network landscape, How a DMR Network Works.
A noncommercial hobby reference compiled by N6JET, gathered from public sources and shared freely for anyone interested in amateur digital voice.