CHATFIELD
Emergency response support communication must be planned before infrastructure is damaged, cellular service becomes congested or teams enter an area without dependable coverage.
ChatField keeps the smartphone as the user interface. Bluetooth links the phone to a J25 carried by each equipped team member, while participating J25 terminals provide the local LoRa mesh communication layer.
Procurement teams should define roles, sectors, check-in rules, escalation paths and acceptance criteria first. A documented exercise can then show where J25 fits inside the organization’s approved incident communications plan.
PREPARED RESPONSE-SUPPORT TEAMS
A local communication layer for organized field support.
Disaster logistics
Coordinate equipped teams moving supplies between staging areas, temporary facilities, distribution points and field sectors.
Volunteer coordination
Support defined groups, supervisors, check-in points and task assignments under an approved response structure.
Field assessment
Plan local PTT, messages and team-location workflows for trained personnel documenting damage or access conditions.
Infrastructure restoration support
Connect equipped crews working along routes, temporary worksites and service-restoration checkpoints with uneven coverage.
INCIDENT AREA PLANNING
Map the response area before selecting the exercise.
Response environments change quickly. Buildings, debris, terrain, vehicles, temporary structures, moving teams and damaged infrastructure can alter the path between equipped personnel.
Command and check-in point
Team registration, assignment, supervisor coordination, device issue and scheduled status reporting.
Staging and supply area
Vehicles, equipment, distribution teams, loading points and movement between temporary facilities.
Field sectors and routes
Assessment teams, restoration crews, delivery routes, access restrictions and changing worker positions.
Temporary service locations
Shelter-support areas, aid distribution points, mobile facilities and other organization-controlled work zones.
SYSTEM WORKFLOW
The phone remains the interface; J25 provides the local LoRa link.
- 01Team member uses the phone appPTT, text, voice messages, offline maps 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 team member.
- 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 incident-area layout allow it, another equipped teammate 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 by the team member and used through the paired smartphone. It is not presented as a public-safety handheld radio, dispatch console or satellite communicator.
Review the complete technical workflow →EXERCISE-BASED EVALUATION
Test the approved response plan before a real incident.
Useful performance depends on terrain, structures, debris, vehicles, antenna position, interference, node placement, team movement and the permitted configuration for the destination market.
| Exercise condition | Buyer inputs | Evaluation method |
|---|---|---|
| Command and field sectors | Supervisor position, team groups, sector boundaries and check-in schedule | Run scheduled PTT, message and status workflows between each defined sector and command point. |
| Staging and logistics routes | Vehicle movement, supply points, loading areas and changing team positions | Follow the real logistics route and record results at handoff and distribution checkpoints. |
| Buildings and damaged areas | Walls, debris, access limits, floor changes and worker position | Test only inside the approved exercise area and record results before and after each obstruction. |
| Temporary facilities | Tents, trailers, shelters, mobile operations and nearby equipment | Evaluate the required workflows using the planned temporary layout and staffing pattern. |
| Primary-system interruption | Approved fallback trigger, escalation contact and recovery procedure | Simulate the authorized contingency step without disabling real emergency or public-safety services. |
BUYER-DEFINED WORKFLOWS
Specify which local support functions must pass.
Local group voice
Define which sectors, supervisors and support roles require push-to-talk communication.
Text and voice messages
Evaluate short operational updates that do not require a live voice exchange.
Team location
Confirm how equipped teams and defined checkpoints should appear in the phone workflow.
Offline response map
Prepare route, sector and facility map data before leaving dependable internet access.
Local team alert
Document the internal acknowledgement and escalation process without treating it as public dispatch.
Team and device setup
Confirm user groups, J25 allocation, app build and operator instructions used for the exercise.
INCIDENT COMMUNICATIONS PLAN
Define where the local mesh starts and where escalation begins.
J25 can be evaluated as one local communication layer for equipped support personnel. The organization remains responsible for command, interoperability, emergency notification, escalation and documentation.
- Primary systems.List the organization’s approved public-safety, dispatch, cellular, satellite or other primary channels.
- Local J25 layer.Define the equipped teams, groups, sectors and operational messages permitted on the local mesh.
- Fallback trigger.Document who may activate the local contingency workflow and under which conditions.
- Escalation path.Keep the designated route to 911, public-safety agencies, incident command and required specialist systems.
- Exercise record.Document configuration, participants, checkpoints, pass or fail results, corrective actions and final approval.
SAFETY + COMPLIANCE BOUNDARY
Local mesh communication is not a public emergency network.
The procurement review must keep J25 local team communication separate from statutory emergency communications, life-safety equipment and the organization’s approved incident command systems.
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 replaced by J25
- 911, emergency dispatch, FirstNet, P25 or other public-safety radio and broadband systems
- Satellite service, certified life-safety equipment or agency interoperability systems
- The incident command structure, emergency plan, training requirements or public rescue services
SAMPLE EXERCISE PLAN
Reproduce one documented response-support operation.
- Map the incident area.Command point, staging areas, temporary facilities, field sectors, routes, obstructions and known coverage gaps.
- Map the organization.Team roles, supervisors, sector groups, check-in rules and the approved escalation chain.
- Define acceptance criteria.Required PTT, message, location, offline-map and local-alert workflows.
- Confirm the sample configuration.Market configuration, app build, device allocation, accessories, controlled documents and exercise safety plan.
- Run and document the exercise.Record pass or fail at each checkpoint without disrupting live emergency or public-safety services.
- Finalize the commercial scope.Confirm quantity, branding, packaging, lead time, training needs and market-specific documents.
Emergency response support communication questions
Which response-support teams can evaluate ChatField J25?
Prepared disaster-logistics, volunteer-coordination, field-assessment, infrastructure-restoration and response-support teams can evaluate J25 for local communication between equipped personnel within an approved incident plan.
How does the phone-paired response-support system operate?
The smartphone remains the interface for PTT, messages, offline maps and team location. Bluetooth connects the phone to the J25 carried by each equipped worker, while participating J25 terminals provide the local LoRa mesh communication layer.
How should an organization test J25 before emergency deployment?
Map the command point, staging areas, supply routes, temporary facilities, field sectors and known coverage gaps. Run a documented exercise using the real team roles, routes, check-in procedure and escalation plan.
Does J25 replace 911, FirstNet or public-safety radio systems?
No. J25 is presented as a local team communication tool for equipped personnel. It does not replace 911, FirstNet, P25 or other public-safety radio systems, emergency dispatch, satellite services or certified life-safety equipment.
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.