WHY THIS EXISTS
A permanent vehicle node intended to become a portable field station.
Most radio installations force a choice: bolt the equipment into the vehicle for dependable power, or keep it portable and accept limited runtime and loose wiring. This project is intended to do both, with uninterrupted transition treated as a required validation gate rather than an established capability.
Extend the mesh from the vehicle
While docked, the design aims to keep the Station G3 powered for long periods and use the vehicle installation as a stable operating base. The external antenna, high-power radio, and onboard Linux computer should make it more capable than a handheld-only setup once validated.
Carry the same node into the field
The intended workflow is to lift out the complete node with its own battery when coverage, testing, or an event requires a better location. Avoiding shutdown, cable-swapping, and a second software environment depends on successful charge-under-load and docking tests.
Support resilient communications
The goal is an independent MeshCore platform useful for temporary coverage, field observation, mesh experiments, and communications when normal infrastructure is unavailable or inconvenient.
Put computing beside the radio
The Orange Pi provides room for logging, monitoring, automation, local tools, and future network integrations at the radio itself. The design is therefore a small edge-computing station—not merely a battery-powered transceiver.
LOCAL DISPLAY + REMOTE TESTING
A field-visible node and a movable test endpoint.
The project is not only a portable repeater. It is intended to provide immediate status at the unit and give us a remote MeshCore node that can be placed where a new feature, route, antenna, or coverage condition needs to be tested.
A larger Orange Pi touchscreen
The planned primary interface is a 5-inch capacitive touchscreen driven by the Orange Pi. It is intended to provide a usable field console for node health, messages, maps, route and packet analysis, test controls, logs, and telemetry—not merely a few lines of status text.
The stock OLED is not the main display
The Station G3 also ships with a 1.3-inch OLED attached to its stock ESP32-S3 daughterboard. The Orange Pi is planned to replace that daughterboard and directly own the radio, so the stock OLED is not assumed to remain in the final build. For the first prototype, HDMI video plus USB touch is preferred over DSI until Orange Pi display compatibility is proven.
A remote endpoint for real-world tests
The portable unit can be temporarily positioned at a coverage edge, event site, elevated location, or other test point. That lets us compare routes, antennas, PA/LNA settings, reception, and range against the established network without permanently installing another node.
A controlled feature-validation node
The Orange Pi is intended to support logs, telemetry, packet observations, and experimental services beside the radio. New MeshCore or companion-software behavior can be exercised on this isolated field node before it is considered for an always-on production node. Remote administration still depends on the backhaul available at the test location.
SYSTEM ARCHITECTURE
Two batteries. One continuous-node goal.
The planned power path keeps the radio on the portable pack while the dock acts as a controlled charging source—never as a second battery wired directly in parallel. Bench testing must prove that this arrangement changes over without a reset.
▰FIXED IN VEHICLE20 Ah LiFePO₄
256 Wh dock reserve
5 A fuse→
⌁CONTROLLED CHARGING14.4 V / 2 A
CC/CV + temperature interlock
dock contacts→
▰REMOVABLE UNIT6 Ah LiFePO₄
76.8 Wh field battery
5 A fuse + switch→
⌁RADIO + COMPUTEStation G3
Orange Pi 3B · external antenna
EXPECTED RUNTIME
Designed to outlast the stop.
Estimates include 15–20% reserve and conversion loss. The real number will be measured under Orange Pi load and PA Level 4 transmissions.
BUILD SEQUENCE
Prove it on the bench first.
No holes, glue, or permanent enclosure decisions until the electrical and thermal behavior is measured.
- 01
Open-plate prototype
Mount the G3, Orange Pi, battery, fuse, switch, and connectors on a removable aluminum or FR-4 plate.
- 02
Power and pin validation
Verify physical header alignment, 5 V stability, GPIO/SPI mapping, polarity, and zero USB-C backfeed risk.
- 03
Stress and RF test
Combine CPU load, storage writes, networking, receive activity, and repeated PA Level 4 transmissions while logging voltage and temperature.
- 04
Docking soak test
Prove charge-under-load behavior, cycle the dock 20 times without a reset, then run an eight-hour docked soak.
- 05
Measure, then enclose
Select a separate drillable ABS/polycarbonate enclosure only after cable bends, airflow, access, and clearances are known.
CORE BILL OF MATERIALS
The major pieces.
Links are references, not endorsements. The enclosure is intentionally deferred until after bench measurements.
RADIO
BQ Voyage Station G3
US915; operated at PA Power Level 4 after validation.
Product page ↗COMPUTE
FIELD POWEROrange Pi 3B V2.1
Linux companion powered from the G3 header after pin verification.
Specifications retained in the build planTalentCell 12.8 V / 6 Ah
76.8 Wh portable LiFePO₄ pack with separate charge and output leads.
Reference listing ↗ DOCK POWERSEFEPODER 12.8 V / 20 Ah
256 Wh LiFePO₄ reserve retained in the vehicle dock.
Reference listing ↗ CHARGINGDROK 80 W CC/CV
Adjusted to 14.4 V / 2 A with backflow protection enabled.
Reference listing ↗PROTECTION + MECHANICAL
Fuse, interlock, Powerpole, bulkhead
5 A fusing, low-temperature lockout, strain relief, standoffs, cooling, and a drillable enclosure.
Selected after bench fit-upNON-NEGOTIABLES
The go/no-go gates.
These are design constraints, not optional finishing details.
- ◇Attach the LoRa antenna before powering the Station G3.
- ◇Never power the Orange Pi by USB-C while the G3 header powers it.
- ◇Confirm 20 clean boots and no undervoltage during CPU + RF stress.
- ◇Require graceful low-voltage shutdown or a read-only/overlay root.
- ◇Block charging below 35°F / 2°C and above the configured high limit.
- ◇Do not run closed-lid until a 100°F ambient thermal soak passes.
- ◇Keep the existing MEIJIA case unmodified and outside the build.
FUTURE UPGRADE PATH
Prove the core, then grow the platform.
The first version is intentionally conservative. These upgrades become candidates only after the baseline power, RF, thermal, and software tests pass.
Purpose-built power path
Replace charge-through reliance on the portable pack with a dedicated LiFePO₄ UPS/power-path controller for deterministic source switching, state reporting, and battery protection.
Solar-ready field charging
Add a fused external input and suitable MPPT controller so the portable node or vehicle dock can accept a folding solar panel during extended off-grid operation.
Deeper battery and thermal data
Expand the INA219 concept into logged voltage, current, watt-hours, enclosure temperature, and charge-state trends with local alerts and a simple status dashboard.
GNSS and environmental sensing
Add optional location, pressure, temperature, or weather sensors when a deployment benefits from geotagged observations. These remain modular rather than baseline dependencies.
Interchangeable antenna system
Use a serviceable bulkhead and strain-relieved feed line to support vehicle, portable mast, or compact field antennas without opening the electronics enclosure.
Additional backhaul options
Add Wi-Fi, Ethernet, cellular, or other IP connectivity where useful, allowing the Orange Pi to synchronize logs or connect local MeshCore tooling without changing the radio core.
Refined dock and enclosure
After real measurements, design guide rails, positive retention, guarded contacts, weather-resistant connectors, and a carry handle around the proven component envelope.
Software and storage hardening
Move toward an overlay/read-only operating system, high-endurance storage, watchdog recovery, and reproducible provisioning so abrupt field conditions do not corrupt the node.
OPEN ENGINEERING RISKS
What still has to be proven.
Orange Pi compatibility
BQ officially validates Raspberry Pi Zero 2W. Header mapping and software control on the Orange Pi are project-specific work.
5 V rail and high-RF stability
The G3 supply must remain stable at peak Orange Pi load and PA Level 4 transmission without false protection trips.
Charge while operating
The TalentCell has separate leads, but uninterrupted pass-through behavior must be demonstrated rather than assumed.
Enclosure heat
A sealed plastic box conflicts with high-power operation. Cooling is decided from measured thermal data.