CHATFIELD
Remote worksite communication becomes a procurement issue when crews move between structures, equipment, roads and work fronts where public networks are weak, intermittent or unavailable.
ChatField keeps the smartphone as the user interface. Bluetooth links the phone to a carried J25, and participating J25 terminals provide the local LoRa mesh communication layer for the equipped team.
The buyer should define the site zones, shift movement and acceptance criteria first. A sample trial can then reproduce the real work pattern instead of relying on a generic distance claim.
WHO THIS PAGE IS FOR
Professional crews working across remote and changing sites.
Construction projects
Coordinate supervisors, trades, logistics staff and moving work fronts across large or partially connected sites.
Energy and utility operations
Support field crews, inspection routes and maintenance roles around remote facilities and linear assets.
Mining and extraction sites
Evaluate local communication around access roads, equipment zones, cuttings and changing elevation without implying hazardous-location approval.
Survey and infrastructure teams
Connect mobile crews working along roads, corridors, civil works and dispersed field checkpoints.
SITE-BASED PLANNING
Map the worksite before selecting the field trial.
Remote sites are not one uniform radio environment. Buildings, steel, equipment, earthworks, vehicle movement and elevation can change the path between equipped workers.
Gate and site base
Fixed coordination points, offices, stores, welfare areas and entry-control roles.
Active work fronts
Moving teams, changing structures, temporary barriers and task-specific access.
Roads and vehicles
Mobile operators, route turns, elevation change and changing separation between workers.
Equipment and structures
Metal, machinery, walls, cuttings and other obstructions around the actual operator position.
SYSTEM WORKFLOW
Phone interface, carried J25 and a local LoRa mesh.
- 01Worker uses the phone appPTT, text, voice messages, offline map and team-location functions remain on the smartphone interface.
- 02Bluetooth links the paired J25The phone passes the local communication task to the J25 carried by that equipped worker.
- 03J25 sends through LoRaThe terminal exchanges information with another participating J25 inside the configured local team network.
- 04A participating node may support another pathWhen configuration and site layout allow it, another equipped worker can participate in the local mesh path.
- 05The teammate receives it on the phoneThe receiving J25 passes the information to its paired smartphone for the operator.
J25 is carried with the worker and used through the paired smartphone. It is not presented as a conventional handheld walkie-talkie.
Review the complete technical workflow →SITE + SHIFT EVALUATION
Test the communication path where the work actually happens.
Useful performance depends on structures, metal, terrain, antenna position, interference, equipment movement, node placement and the permitted configuration for the destination market.
| Worksite condition | Buyer inputs | Field trial method |
|---|---|---|
| Open work areas | Worker spacing, moving roles and carry position | Follow the actual task route and record PTT, message and location results at defined points. |
| Structures and compounds | Walls, steel, containers, offices and control points | Test both inside and outside the locations used during the shift. |
| Cuttings and elevation | Terrain blocking, level changes and line-of-sight transitions | Record results before, during and after each elevation or route transition. |
| Roads and vehicles | Travel routes, moving speed, separation and operator position | Run the planned vehicle or foot route using the intended device position. |
| Heavy equipment zones | Metal, machine position, noise and restricted access | Evaluate the required workflows with equipment arranged as it is during operation. |
BUYER-DEFINED WORKFLOWS
Specify which site functions must pass.
Local group voice
Define which supervisors, field workers and mobile roles require push-to-talk communication.
Text and voice messages
Evaluate short operational messages for tasks that do not require a live voice exchange.
Team location
Confirm how equipped workers and defined checkpoints should appear in the phone workflow.
Offline site map
Prepare the site, road or corridor map data required before the team leaves dependable internet access.
Local SOS process
Document the internal site response procedure without presenting it as a substitute for public emergency services.
Shift and device setup
Confirm the app build, user groups, J25 allocation and operator instructions used for the sample trial.
SAFETY + COMPLIANCE BOUNDARY
Radio evidence is not the same as site-safety approval.
Remote worksites can have project-specific safety, environmental and hazardous-location requirements. These must be checked separately from FCC radio evidence.
Confirmed radio evidence
- J25 FCC ID: 2BVP9-J25
- LoRa: 903–927.5 MHz under the referenced FCC Part 15C report
- Bluetooth LE: 2402–2480 MHz under the referenced FCC Part 15C report
Not claimed on this page
- Intrinsic-safety or explosive-atmosphere certification
- Approval for every hazardous or regulated work zone
- A universal operating range for every site layout
SAMPLE EVALUATION PLAN
Reproduce one real work shift.
- Map the site.Gate, base, work fronts, structures, roads, equipment areas, elevation changes and known coverage gaps.
- Map the team.Roles, shift pattern, moving routes, fixed checkpoints and expected spacing.
- Define acceptance criteria.Required PTT, message, location, offline-map and local SOS workflows.
- Confirm the sample configuration.Market configuration, app build, device allocation, accessories and controlled documents.
- Run the real route.Record pass or fail at the points that matter instead of relying on a stationary demonstration.
- Finalize the commercial scope.Confirm quantity, branding, packaging, lead time and site-specific document requirements.
Important operating boundaries
What this solution supports
- Local communication for equipped remote-worksite teams
- Phone-paired PTT, messages, offline maps and team-location workflows
- Site- and shift-based testing for a defined project
What buyers should not assume
- It does not replace the site safety plan or public emergency network
- No hazardous-location approval is implied
- One range number cannot represent every structure, cutting or equipment zone
Remote worksite communication questions
Which remote worksites can evaluate ChatField J25?
Construction, energy, infrastructure, survey, maintenance, mining and other remote field teams can evaluate J25 where local team communication is required beyond reliable cellular coverage.
How does the phone-paired worksite system operate?
The smartphone remains the interface for PTT, messages, maps and team location. Bluetooth connects the phone to the carried J25, while participating J25 terminals provide the local LoRa mesh communication layer.
How should a buyer test a remote worksite?
Map the gate, base, work fronts, structures, roads, equipment areas and elevation changes. Test the real shift routes and record PTT, message and location results at defined checkpoints.
Is J25 certified for explosive or hazardous locations?
No hazardous-location or intrinsic-safety certification is claimed on this page. Buyers must confirm any required site-specific safety approval separately before use.
What FCC evidence is available for U.S. buyers?
J25 FCC material identifies FCC ID 2BVP9-J25 and FCC Part 15C reports for LoRa operation at 903–927.5 MHz and Bluetooth Low Energy at 2402–2480 MHz.