Bridge Phones, CJ-1,
and Radio Communications
Link’d DMR is being built to connect teams through cellular push-to-talk, offline phone-to-phone mesh, and optional real DMR or analog radio gateways. Stay connected across the internet, local mesh, or supported radio hardware.
- Cellular PTT
- Offline Mesh
- CJ-1 RF Bridge
- Security-First Relay
Current status: Link’d DMR is currently in active development and private owner testing. Cellular PTT, offline mesh, automatic switching, radio gateways, and hardware compatibility must complete real-device and field validation before wider release.
Core capabilities
One app for connected and off-grid communication
Link’d DMR is being developed around six core capabilities that cover everyday cellular push-to-talk, offline mesh networking, and optional real radio bridging.
Cellular PTT
Radio-style push-to-talk over Wi-Fi, 4G, or 5G with talkgroups, caller identity, and floor control.
Offline Mesh
Nearby Android phones are designed to form a local Wi-Fi mesh when internet service disappears.
CJ-1 RF Bridge
A compatible CJ-1 can add real DMR and analog RF capability and act as a gateway between phones and radios.
Channel Management
Organize talkgroups, channels, contacts, Radio IDs, and supported radio settings from one interface.
Contacts and Caller ID
Display saved user names, Radio IDs, unknown callers, talkgroups, and live call status.
Security-First Relay
Unverified communication paths stay unavailable instead of pretending a transmission succeeded.
Built for modern teams
Everything you need in your pocket
From live push-to-talk and Radio IDs to mesh routing and optional RF bridging, Link’d DMR brings the core controls of a field communications system into one Android app.
Explore All FeaturesCellular / RF dashboard 
Contacts and Last Heard 
Offline Mesh 
Field Relay / Gateway
Radio bridge
How it works
A compatible gateway such as the CJ-1 sits between an existing radio system and Link’d phone users, relaying live audio in both directions.
Radio to phone
A radio user transmits on the configured DMR or analog system.
The supported gateway receives the RF call.
Link’d forwards the authorized live call to connected phone users.
Phone to radio
A phone user presses PTT.
Link’d delivers the live audio to the authorized gateway.
The gateway keys the selected radio channel or talkgroup and retransmits it.
Gateway support depends on the exact device, radio interface, licensing, configuration, and successful hardware validation.
Offline mesh
Designed to keep working when coverage disappears
When internet service drops, nearby Link’d phones are designed to keep talking to each other over a local Wi-Fi mesh.
Regular Android phones use local Wi-Fi peer connections.
Nearby phones can forward traffic through multiple hops.
Additional powered field-relay devices can improve resilience.
A node that regains internet access may reconnect the local group to remote Link’d users.
A compatible CJ-1 may bridge the offline group into a radio system.
Estimated range
Early design estimates range from roughly 100–500 feet per ordinary phone-to-phone hop in open conditions. Dedicated relays and properly installed directional Wi-Fi bridges may extend coverage significantly. Actual results depend on terrain, device hardware, mounting, interference, and line of sight.
Compatibility
What works with Link’d DMR
Capabilities differ by hardware. Here is how support is planned across device types.
Regular Android phones
Planned features
- Cellular PTT
- Offline mesh
- Talkgroups
- Contacts
- Field relay mode
CJ-1 / supported radio phones
Additional capabilities after successful hardware validation
- Real DMR / analog RF
- Physical PTT
- Channel and talkgroup integration
- Phone-to-radio gateway mode
Future adapters
Possible future targets
- Other Android radio phones
- Officially documented hardware APIs
- Approved MOTOTRBO/WAVE integrations
- Private experimental adapters kept outside the public build
Compatibility is limited to the devices and integrations listed above. Universal radio or hardware compatibility is not claimed.
Private beta
Help test Link’d DMR in the real world
Tell us about your team, devices, and use case. Private-beta invitations are limited while core features complete validation.
Download
Get the app
Releases are distributed as signed APKs with published checksums so testers can verify exactly what they install.
Private build not publicly available yet
Link’d DMR is distributed only to approved private-beta testers as a signed APK. A public download will appear here once a signed release is published. In the meantime, you can request access to the private beta.
Request Beta AccessStatus
Platform status
Service status
Development environment — public service not yet launched- Control planeIn development
- Cellular relayIn development
- AuthenticationIn development
- ProvisioningIn development
- File deliveryIn development
- Public beta availabilityIn development
Live service monitoring will appear here once public infrastructure is launched. This panel is prepared to read from a status endpoint configured via NEXT_PUBLIC_STATUS_ENDPOINT.