Category: Guides

One of the best things about Stratux is that it’s repairable and maintainable—unlike sealed commercial units that become expensive paperweights when they fail. But “repairable” doesn’t mean “indestructible.” To keep your Stratux running reliably for years, you need to understand its weak points and take preventive action.

In this guide, we’ll cover the essential maintenance tasks that will keep your Stratux receiver flying strong: SD card care, firmware updates, antenna maintenance, thermal management, and more. Think of this as your Stratux care checklist.

The #1 Failure Point: SD Cards

Let’s start with the most common cause of Stratux failures: microSD card corruption. SD cards have a limited number of write cycles, and the Stratux operating system is constantly writing logs, caching data, and updating files. Over time, cheap or worn-out cards will fail—often without warning.

SD Card Best Practices:

• Use quality cards: Stick with SanDisk, Samsung, or Kingston. Avoid no-name brands from Amazon.
• Choose endurance-rated cards if available: “High Endurance” or “MAX Endurance” cards are designed for constant read/write cycles (think dashcams and security cameras). They last longer.
• 32GB is the sweet spot: Larger cards don’t add functionality, and smaller cards may run out of space for logs.
• Keep a backup image: Once you have Stratux configured the way you like, create a backup image of the SD card. If it fails, you can restore to a new card in minutes.
• Replace annually: Treat SD cards as consumable. Budget $10/year for a fresh card and swap it out preventively.

How to Back Up Your SD Card:

On Mac, use Disk Utility or dd from Terminal. On Windows, use Win32DiskImager. On Linux, use dd. The process takes 15-30 minutes and could save you hours of troubleshooting later.

Pro tip: Label your backup image file with the date so you know when it was created. Store it somewhere safe—cloud storage, external drive, etc.

Firmware Updates: Stay Current (But Not Bleeding Edge)

The Stratux development team periodically releases firmware updates with bug fixes, performance improvements, and new features. Keeping your Stratux updated ensures compatibility with the latest EFB app versions and ADS-B standards.

How to Update Stratux Firmware:

1. Connect to your Stratux WiFi and open a web browser
2. Navigate to http://192.168.10.1 (the Stratux web interface)
3. Go to the Settings page
4. Look for “Software Update” or “Update” section
5. If a new version is available, click “Update”
6. Wait for the update to complete (do NOT power off during this process)
7. Reboot and verify everything still works

When to Update (and When Not To):

• Update if: You’re experiencing bugs, missing features, or your EFB app recommends it
• Don’t update the night before a big trip: If it ain’t broke, don’t fix it right before you need it most
• Read the release notes: Know what’s changing before you commit
• Wait a week after a new release: Let early adopters find the bugs first

Frequency: Check for updates every 2-3 months, or before the start of flying season. Most pilots update 2-3 times per year.

Thermal Management: Keep It Cool

Stratux generates heat—especially the SDR dongles, which can get surprisingly hot during extended operation. Heat is the enemy of electronics. Overheating can cause:

• Reduced SDR sensitivity (you’ll miss distant aircraft)
• System crashes and reboots
• Shortened component lifespan
• SD card corruption (heat accelerates wear)

Cooling Best Practices:

• Use a case with ventilation: Quality Stratux cases have airflow holes and fan mounts. Don’t seal your Stratux in an airtight box.
• Install a cooling fan: A small 5V fan keeps air moving over the Pi and SDRs. Most kits include one—use it.
• Mount away from direct sunlight: Don’t leave your Stratux on the glareshield in the summer sun. Find a shaded spot.
• Monitor temperature: The Stratux web interface shows CPU temperature. If it’s consistently above 70°C (158°F), you need better cooling.
• Consider heatsinks: Small adhesive heatsinks on the SDR dongles can help dissipate heat, especially in hot climates.

Summer flying tip: If you park in the sun before a flight, your Stratux may be heat-soaked. Let it run for a few minutes before takeoff to ensure it’s stable.

Antenna Care and Maintenance

Your antennas are critical to ADS-B reception. Damaged or poorly connected antennas mean missed traffic and incomplete weather. Fortunately, antennas are simple to inspect and maintain.

Antenna Checklist:

• Inspect connectors: Make sure SMA connectors are tight and not bent. A loose connection kills performance.
• Check for physical damage: Cracks, kinks, or broken elements reduce antenna gain.
• Clean contacts: Dust and corrosion can build up on connectors. A quick wipe with a clean cloth helps.
• Verify you haven’t swapped them: The 978 MHz (shorter) and 1090 MHz (longer) antennas look similar but are tuned differently. Double-check they’re on the correct SDR.
• Upgrade if needed: Stock antennas work fine, but if you fly in remote areas or want maximum range, consider upgraded antennas with higher gain.

Pro tip: If you’re getting poor reception on one frequency but not the other, swap the antennas between SDRs as a troubleshooting step. If the problem moves with the antenna, you’ve found the culprit.

Power Supply: The Forgotten Component

A flaky power supply causes mysterious reboots, WiFi dropouts, and GPS glitches. The Raspberry Pi needs a stable 5V/3A supply. Skimping on power is a false economy.

Power Best Practices:

• Use a quality USB power adapter: Official Raspberry Pi adapters are ideal. Avoid cheap phone chargers.
• Avoid cigarette lighter adapters if possible: They can be noisy (electrically) and unreliable. If you must use one, get a high-quality unit rated for 3A+.
• Check your cable: Long, thin USB cables have voltage drop. Use a short, thick cable (ideally 20 AWG or better).
• Monitor voltage: Some Raspberry Pi models display a lightning bolt icon if voltage drops too low. If you see this, fix your power immediately.
• Consider a battery pack: A USB battery bank provides clean, stable power and can run Stratux for 4-6 hours. Great for portable operation or as backup.

Physical Mounting and Protection

Stratux isn’t certified avionics—it’s not shock-mounted or vibration-tested. But you can minimize wear and tear with smart mounting choices.

Mounting Tips:

• Secure it: Velcro, non-slip pads, or a dedicated mount. Don’t let your Stratux slide around during turbulence.
• Protect from impact: A good case is essential. It protects against accidental drops and bumps.
• Keep it accessible: You may need to reboot occasionally. Mount it where you can reach the power switch.
• Cable management: Secure the power and antenna cables so they don’t snag or pull loose.

Routine Maintenance Schedule

Here’s a simple maintenance schedule to keep your Stratux healthy:

Frequency	Task
Before each flight	Power on, verify GPS lock and traffic reception
Monthly	Inspect antennas and connectors, check case ventilation
Every 2-3 months	Check for firmware updates
Annually	Replace SD card preventively, clean case interior, verify all connections
As needed	Replace damaged cables, upgrade components, recalibrate AHRS

Troubleshooting Common Wear Issues

Symptom: Intermittent GPS lock
Likely cause: Loose GPS module connection, failing GPS antenna, or SD card corruption affecting GPS driver.
Fix: Reseat GPS module, check antenna connection, reflash SD card.

Symptom: Gradual decrease in traffic reception
Likely cause: SDR dongles overheating, antenna damage, or SDR firmware issues.
Fix: Improve cooling, inspect/replace antennas, update Stratux firmware.

Symptom: Random reboots during flight
Likely cause: Insufficient power supply, overheating, or SD card failure.
Fix: Upgrade power supply, add cooling, replace SD card.

When to Replace vs Repair

One of Stratux’s greatest strengths is repairability. Almost every component is modular and replaceable:

• SD card failure? Swap in a new one ($10)
• SDR dongle died? Replace it ($25)
• GPS module flaky? New module is $15-30
• Raspberry Pi dead? Replace for $35-55
• Case cracked? 3D print a new one or buy a replacement

Compare that to a commercial ADS-B receiver: if it fails out of warranty, you’re often looking at full replacement cost ($500-800). With Stratux, you fix what broke and keep flying.

This is the Framework Laptop philosophy in action: you own your hardware, you can repair it, and you’re not at the mercy of a manufacturer’s support policy.

The Bottom Line

Stratux is low-maintenance, but not no-maintenance. A little preventive care goes a long way:

• Replace your SD card annually
• Keep firmware reasonably up-to-date
• Don’t let it overheat
• Use clean, stable power
• Inspect antennas periodically

Do these things, and your Stratux from Crew Dog Electronics will serve you reliably for years. And when something does eventually fail? You’ll fix it yourself for pocket change and be back in the air.

Maintain it, fly it, own it forever.

ForeFlight gets all the attention when it comes to EFB apps—and for good reason, it’s excellent. But ForeFlight isn’t the only game in town, and plenty of pilots fly happily with Avare, FlyQ, iFly GPS, WingX, or Garmin Pilot. The good news? Stratux works beautifully with all of them.

In this guide, we’ll walk through how to connect your Stratux receiver to the most popular EFB apps beyond ForeFlight. Whether you’re an Android user flying with Avare, a FlyQ devotee, or exploring alternatives, you’ll be up and running in minutes.

Why Choose a Different EFB?

Before we dive into setup, let’s acknowledge why pilots choose alternatives to ForeFlight:

• Price: ForeFlight costs $299/year for the Plus plan. Avare is free. FlyQ is $99/year. That’s significant for budget-conscious pilots.
• Platform: ForeFlight is iOS-only. If you fly with an Android tablet, you need a different solution.
• Features: Some pilots prefer the interface or specific features of other apps.
• Philosophy: Avare is open-source, appealing to pilots who value transparency and community development.

The beauty of Stratux is that it’s platform-agnostic. It speaks standard protocols (GDL 90, NMEA) that nearly every EFB app understands.

Avare (Android): Free, Open-Source, and Capable

Avare is the go-to EFB for Android pilots. It’s completely free, open-source, and surprisingly full-featured. It includes sectional charts, IFR plates, airport diagrams, weather, and—crucially—full support for Stratux.

Setting Up Stratux with Avare:

1. Power on your Stratux and wait for the WiFi network to appear (usually named “stratux”)
2. Connect your Android device to the Stratux WiFi network (password: “stratux” by default)
3. Open Avare and tap the menu icon (three horizontal lines)
4. Go to Settings → IO Options
5. Enable “Connect to Stratux” or select GDL90 as the input protocol
6. Avare should auto-detect the Stratux at IP address 192.168.10.1
7. Verify connection: You should see GPS position, traffic targets, and weather tiles appearing on the map

Pro Tips for Avare + Stratux:

• Download chart data over WiFi at home—Stratux’s network won’t have internet access in flight
• Avare’s traffic display is simple but effective—tap a target for details
• Enable “Show METAR” overlay to see weather conditions at a glance
• Avare supports AHRS from Stratux if you have it configured

FlyQ (iOS/Android): Affordable and Powerful

FlyQ is a strong ForeFlight competitor at a fraction of the price ($99/year for the full VFR+IFR suite). It’s available on both iOS and Android, has a clean interface, and works flawlessly with Stratux.

Setting Up Stratux with FlyQ:

1. Connect to the Stratux WiFi network from your device
2. Open FlyQ and tap the menu
3. Go to Settings → Devices & Connectivity
4. Under ADS-B Devices, select “Stratux” or “Generic GDL90”
5. FlyQ will scan for the device and connect automatically
6. Verify: Check that GPS, traffic, and weather are all showing as “Connected” in green

FlyQ Features with Stratux:

• Full NEXRAD weather overlay
• Traffic display with altitude, heading, and distance
• Synthetic vision (if your Stratux has AHRS)
• Geo-referenced approach plates with GPS position
• Verbal traffic alerts (“Traffic, 2 o’clock, 500 feet below”)

FlyQ’s traffic alerts are particularly impressive—clear, timely, and not overly chatty. It strikes a good balance between awareness and distraction.

Garmin Pilot (iOS/Android): Premium Option

Garmin Pilot is the official Garmin EFB app. It’s pricey ($99/year just for the app, before chart subscriptions), but if you already have a Garmin panel and want seamless integration, it’s worth considering. And yes, it works with Stratux.

Setting Up Stratux with Garmin Pilot:

1. Connect to Stratux WiFi
2. Open Garmin Pilot
3. Tap Tools → Devices
4. Add a new device and select “GDL 39 / GDL 39 3D” (Stratux emulates this protocol)
5. Enter the IP address: 192.168.10.1
6. Garmin Pilot will connect and display traffic/weather overlays

Note: Garmin Pilot sometimes prefers Garmin-branded hardware. If you have connection issues, try selecting “Generic GDL 90” instead.

WingX (iOS): Veteran EFB with a Loyal Following

WingX has been around since the early iPad days. It’s not as flashy as ForeFlight or FlyQ, but it’s solid, stable, and well-liked by pilots who value reliability over bells and whistles.

Setting Up Stratux with WingX:

1. Connect to Stratux WiFi
2. Open WingX
3. Go to Settings → Connected Devices
4. Select “Add Device” and choose “Stratux” or “GDL 90”
5. WingX should auto-discover the Stratux and connect
6. Check the device status page to confirm GPS, traffic, and weather are active

iFly GPS (iOS/Android/Windows): Cross-Platform Flexibility

iFly GPS is one of the few EFB apps that runs on iOS, Android, AND Windows tablets. If you fly with a Windows Surface or similar device, iFly is your best bet. It also has dedicated hardware options, but works great with Stratux on any tablet.

Setting Up Stratux with iFly GPS:

1. Connect to Stratux WiFi
2. Open iFly GPS
3. Tap Menu → Setup → External Devices
4. Enable “WiFi Device” and select “Stratux”
5. iFly will connect and display status in the top bar
6. Verify traffic and weather are populating on the map

Foreflight Alternatives Summary

EFB App	Platform	Cost	Stratux Compatibility
Avare	Android	Free	Excellent (native support)
FlyQ	iOS, Android	$99/yr	Excellent
Garmin Pilot	iOS, Android	$99/yr + charts	Good (GDL 39 mode)
WingX	iOS	$99/yr	Good
iFly GPS	iOS, Android, Windows	$69-$99/yr	Excellent

Troubleshooting Common Connection Issues

Problem: Can’t see Stratux WiFi network
Solution: Wait 60-90 seconds after power-on for Stratux to fully boot. If still missing, try rebooting the Stratux or reflashing the SD card.

Problem: Connected to WiFi but no data in app
Solution: Check that your EFB app is set to look for external GPS/ADS-B. Verify the IP address (should be 192.168.10.1). Try forgetting the WiFi network and reconnecting.

Problem: GPS works but no traffic or weather
Solution: Make sure you’re in an area with ADS-B coverage (not in a remote valley). Check the Stratux web interface (http://192.168.10.1) to see if towers are being received. Verify both SDR radios are connected.

Problem: Frequent disconnections
Solution: Low power supply can cause WiFi instability. Use a high-quality USB power source (5V/3A minimum). Avoid long or thin USB cables. Check for overheating.

Advanced: Using Multiple Devices Simultaneously

One of Stratux’s killer features: it can serve multiple devices at once. You can have your iPad running FlyQ, your co-pilot’s Android tablet running Avare, and a phone running Garmin Pilot—all connected to the same Stratux unit simultaneously.

This is especially useful for:

• Flight instruction (instructor and student both have moving maps)
• Dual-pilot operations (both pilots have independent displays)
• Backup redundancy (if one tablet dies, the other keeps working)

The Bottom Line

Stratux’s open-source, standards-based approach means it works with virtually every EFB app on the market. You’re not locked into a single ecosystem. Whether you’re a die-hard Avare user, a FlyQ convert, or experimenting with different apps, your Stratux from Crew Dog Electronics will deliver traffic and weather reliably.

That’s the Framework Laptop philosophy in action: open standards, user choice, and freedom to use the tools that work best for you. No vendor lock-in. No artificial restrictions. Just solid ADS-B data delivered to whatever device you choose to fly with.

Fly the app you love, with the hardware that just works.

Let’s talk honestly about Stratux AHRS. It’s one of the most misunderstood features of the Stratux ecosystem, often over-promised by enthusiasts and under-delivered in practice. If you’re considering adding AHRS to your Stratux—or already have it and are wondering why it’s not performing like a $15,000 Garmin G5—this guide is for you.

We’ll cover how AHRS works, what it can realistically do, its limitations, and whether it’s worth adding to your setup.

What is AHRS?

AHRS stands for Attitude and Heading Reference System. It’s the technology that tells your instruments (or EFB app) the aircraft’s pitch, roll, and yaw. In a modern glass cockpit, AHRS feeds the attitude indicator (artificial horizon), directional gyro, and synthetic vision displays.

Traditional AHRS systems use gyroscopes, accelerometers, and magnetometers to calculate aircraft attitude. They’re calibrated, temperature-compensated, shock-mounted, and certified to rigorous standards. They cost thousands of dollars and require professional installation.

Stratux AHRS uses a $15-30 MEMS sensor module connected to the Raspberry Pi. It’s not certified. It’s not shock-mounted. And it has limitations you need to understand before you trust it in flight.

How Stratux AHRS Works

The most common AHRS module for Stratux is the MPU-9250 or ICM-20948 chip. These tiny sensors contain:

• 3-axis gyroscope: Measures angular velocity (how fast the aircraft is rotating)
• 3-axis accelerometer: Measures linear acceleration and gravity vector
• 3-axis magnetometer: Measures magnetic field (for heading reference)

The Stratux software reads these sensors, applies sensor fusion algorithms, and outputs attitude data to your EFB app via WiFi. Your app—ForeFlight, Garmin Pilot, FlyQ, etc.—then displays synthetic vision or backup attitude information.

The Challenge: Sensor Fusion

Raw sensor data is noisy. The accelerometer picks up every bump and vibration. The magnetometer is affected by nearby electronics and metal. The gyroscope drifts over time. To produce usable attitude information, these sensors must be “fused” using complex math (typically a Kalman filter or complementary filter).

Certified AHRS systems have years of engineering behind their sensor fusion algorithms. Stratux uses open-source algorithms that are… good enough for some purposes. But not for all.

What Stratux AHRS Can Do

In smooth air, with proper calibration and mounting, Stratux AHRS can provide:

• Basic pitch and roll indication — accurate within 5-10 degrees in level flight
• Synthetic vision overlays — terrain and obstacle awareness on your EFB
• Backup attitude reference — better than nothing in an emergency, but not a primary instrument
• Heading information — though magnetometer calibration is challenging and heading can drift

For VFR flying in good weather, Stratux AHRS can enhance your situational awareness. It’s genuinely useful for low-altitude terrain avoidance and maintaining orientation in hilly or mountainous areas.

What Stratux AHRS Cannot Do

Let’s be brutally honest about the limitations:

1. It’s Not for IMC

Do NOT use Stratux AHRS as a primary instrument for IFR flight. It’s not certified. It can drift. It’s affected by vibration and temperature. If you’re in actual IMC and your vacuum instruments fail, Stratux AHRS might help you keep wings level long enough to break out—but it’s an emergency backup at best, not a flight instrument.

2. It Drifts in Turns

During sustained turns or unusual attitudes, the accelerometer-based attitude correction gets confused. Centrifugal forces mimic gravity, and the system can lose accuracy. Certified AHRS units compensate for this with GPS-aided algorithms; Stratux does not do this reliably.

3. Mounting Matters (A Lot)

Stratux AHRS assumes the sensor is level with the aircraft’s attitude. If your Stratux unit is sitting at an angle on your passenger seat or slipping around in a cupholder, the attitude indication will be wrong. Some pilots 3D-print custom mounts or Velcro the unit to a flat surface—but even then, calibration is tricky.

4. Vibration Degrades Performance

Every engine vibration, every bump of turbulence, every gust shakes the sensor. Certified AHRS units are shock-mounted and use advanced filtering. Stratux filters do their best, but you’ll see jitter and drift, especially in rough air or behind a radial engine.

5. Magnetometer Interference

The magnetometer (used for heading) is easily disturbed by nearby electronics, speakers, metal structure, and even your iPad. Magnetic declination must be set correctly. And even with perfect calibration, heading drift of 5-10 degrees over time is common.

Calibration: The Make-or-Break Step

If you decide to use Stratux AHRS, proper calibration is essential. Here’s the process:

1. Mount the Stratux securely — it must be level with the aircraft’s longitudinal and lateral axes
2. Access the Stratux web interface — connect to the WiFi network and go to http://192.168.10.1
3. Navigate to the AHRS settings page
4. Place the aircraft on level ground — use a bubble level to verify
5. Run the accelerometer calibration — this establishes the “level flight” reference
6. Perform a magnetometer calibration — this requires rotating the aircraft (or the Stratux) through multiple orientations to map magnetic interference

Pro tip: Recalibrate every few flights, especially if you’ve moved the Stratux or flown to a location with significantly different magnetic declination.

Real-World Performance: What Pilots Report

I’ve talked to dozens of Stratux users about their AHRS experience. Here’s the consensus:

• “Good enough for VFR situational awareness” — most common response
• “Drift is noticeable after 20-30 minutes” — heading and pitch slowly creep off
• “Useless in turbulence” — the display becomes too jittery to trust
• “Synthetic vision is cool but not essential” — neat feature, but traffic and weather are more valuable
• “I ended up disabling it” — some pilots find the unreliable data more distracting than helpful

Should You Add AHRS to Your Stratux?

Here’s my recommendation, pilot to pilot:

Skip it if:

• Your primary interest is traffic and weather (the core value of Stratux)
• You fly mostly XC in good VFR conditions
• You already have a full glass panel or solid backup instruments
• You want simplicity and reliability over experimental features

Try it if:

• You fly in mountainous terrain and want terrain awareness
• You’re a tinkerer who enjoys experimenting with tech
• You want a very basic emergency backup attitude reference
• You’re building your own Stratux and the module only costs $20

Stratux AHRS vs Certified Units

Let’s be clear: Stratux AHRS is not in the same league as certified units. A Garmin G5, Aspen EFD, or even a mid-tier portable like the Sentry Mini delivers far superior performance. Here’s why:

Feature	Stratux AHRS	Certified AHRS
Accuracy	±5-10°	±1-2°
Drift	Noticeable over time	Minimal, GPS-aided
Turbulence handling	Poor (jittery)	Excellent (filtered)
Calibration	User-performed, challenging	Factory-calibrated
Mounting	Critical, DIY	Professional install
Cost	$20 module	$2,000-$15,000

You get what you pay for. Stratux AHRS is a $20 experiment. Certified AHRS is a $10,000 life-saving instrument. Know the difference.

The Bottom Line on Stratux AHRS

Stratux’s real value is dual-band ADS-B traffic and weather reception. The core Stratux functionality is rock-solid and genuinely useful. AHRS is an optional add-on that works… sometimes, sort of, if you’re lucky.

If you’re buying a pre-built Stratux from Crew Dog Electronics, ask whether AHRS is included and whether you actually need it. If you’re building your own, you can add the module for $20 and experiment—but don’t be disappointed if you end up disabling it after a few flights.

The Framework Laptop philosophy—repairability, openness, hackability—applies here. Stratux AHRS is a fun experiment that might add value for some pilots. But it’s not a primary instrument, and it never will be.

Fly smart. Know your tools. And never trust uncertified attitude information in IMC.

Stay safe up there.

If you’ve been hearing about ADS-B for years but still aren’t 100% clear on the difference between “ADS-B In” and “ADS-B Out”—or what the FAA actually requires—you’re not alone. These terms get thrown around constantly, but the distinction matters for your wallet, your panel, and your safety.

Let’s break it down in plain English, pilot to pilot.

ADS-B Out: The FAA Mandate

ADS-B Out is what the FAA requires for most operations. Since January 1, 2020, aircraft flying in controlled airspace (Class A, B, and C, plus Class E above 10,000 feet MSL) must be equipped with ADS-B Out capability.

What does ADS-B Out do? Your aircraft broadcasts its position, altitude, velocity, and call sign to ATC and other aircraft. Think of it as a digital transponder on steroids. Instead of just responding to radar interrogations, your plane is actively announcing its presence to the world.

ADS-B Out Requirements:

• Must be certified and installed in your panel
• Transmits on 1090 MHz (for jets and high-performance aircraft) or 978 MHz UAT (for most GA aircraft below 18,000 feet)
• Requires a WAAS GPS source
• Must meet DO-260B or DO-282B standards
• Costs $1,500-$6,000+ for hardware and installation

The bottom line: If you fly in the airspace covered by the mandate, you need ADS-B Out. There’s no DIY option here—this is certified avionics territory. Popular solutions include Garmin GTX 345, Stratus ESG, FreeFlight RANGR, and uAvionix tail Beacon.

ADS-B In: Free Traffic and Weather

ADS-B In is the receiver side of the equation—and this is where things get interesting for budget-conscious pilots. ADS-B In lets you receive:

• Traffic: See nearby aircraft broadcasting ADS-B Out (both 1090 and 978 MHz)
• Weather: FIS-B services including NEXRAD radar, METARs, TAFs, winds aloft, AIRMETs, SIGMETs, and TFRs
• TIS-B traffic: ATC rebroadcasts non-ADS-B traffic in your area (requires you to have ADS-B Out)

Here’s the key difference: ADS-B In is NOT required by the FAA. It’s optional. But it’s incredibly useful for situational awareness, and thousands of pilots have added it to their cockpits.

ADS-B In Options:

• Portable receivers: Stratux, Sentry, Ping, SkyEcho—these connect wirelessly to your iPad or EFB
• Panel-mounted: Many ADS-B Out transponders include built-in ADS-B In (like the GTX 345 or Stratus ESGi)
• Hybrid: Some pilots install certified Out but use portable In to save on panel space and cost

What Does Stratux Provide?

A Stratux receiver is an ADS-B In device. It receives both 978 MHz UAT and 1090 MHz transmissions, giving you dual-band coverage. That means:

• You’ll see traffic from aircraft broadcasting on either frequency
• You’ll receive FIS-B weather (only transmitted on 978 MHz in the US)
• You’ll get GPS position data from the built-in GPS module
• Optional AHRS provides attitude information for synthetic vision (with limitations)

What Stratux does NOT provide: Stratux is receive-only. It does not meet the ADS-B Out mandate. You still need a certified transponder if you fly in controlled airspace. Think of Stratux as an amazing situational awareness tool, not a compliance solution.

TIS-B: The Bonus Feature

Here’s where things get clever. If you have ADS-B Out installed, ATC ground stations will rebroadcast nearby non-ADS-B traffic to you via TIS-B (Traffic Information Service-Broadcast). This means your ADS-B In receiver—like your Stratux—can see older aircraft that don’t have ADS-B Out yet.

Important caveat: TIS-B only works if:

1. You have ADS-B Out (so ATC knows you’re there)
2. You’re within range of a TIS-B-capable ground station
3. There’s Mode C/S traffic in your area for ATC to rebroadcast

If you’re flying an aircraft without ADS-B Out, you’ll only see other aircraft that are transmitting ADS-B. You won’t get TIS-B service. That’s fine—you’ll still see most traffic in busy areas, since ADS-B adoption is nearly universal now.

The FAA Mandate: Who Needs What?

Let’s cut through the confusion with some real-world scenarios:

Scenario 1: VFR pilot flying under Class B
You’re flying a Cessna 150 out of a small airport, staying under the Class B shelf. You never enter controlled airspace.
Requirement: None. No ADS-B Out needed. But an ADS-B In receiver like Stratux still gives you weather and traffic awareness.

Scenario 2: IFR pilot in the system
You regularly file IFR and fly through Class C or B airspace.
Requirement: ADS-B Out is mandatory. Add a Stratux for bonus traffic and weather on your iPad.

Scenario 3: Weekend warrior at a Class D field
You fly VFR out of a towered airport, occasionally transitioning through Class C.
Requirement: ADS-B Out needed for Class C penetrations. Stratux adds significant safety value.

Scenario 4: Backcountry adventurer
You fly mountain strips and Class G airspace exclusively.
Requirement: No ADS-B Out required. A Stratux-equipped iPad gives you weather and traffic with no panel modifications.

Can You Get By with Just ADS-B In?

Legally? If you fly outside the mandate areas, absolutely. Practically? Stratux and other ADS-B In devices have become essential tools even for pilots who never touch controlled airspace.

Here’s why:

• Traffic awareness: See and avoid is easier when you can see
• Weather radar: Real-time NEXRAD on your iPad beats calling Flight Watch
• TFR avoidance: Don’t be that pilot who accidentally busts a presidential TFR
• Winds aloft: Actual winds in flight, updated continuously
• GPS backup: If your panel GPS fails, Stratux provides position

Cost Comparison: In vs Out

Let’s talk money:

Equipment	Function	Cost
DIY Stratux	ADS-B In only	$210-230
Pre-built Stratux	ADS-B In only	$379-449
Garmin GTX 345	ADS-B Out + In	$5,000-7,000 installed
Stratus ESGi	ADS-B Out + In	$4,000-6,000 installed
uAvionix tailBeacon	ADS-B Out only	$2,000-3,000 installed

Many pilots choose a tailBeacon or SkyBeacon for Out (meeting the mandate) and add a Stratux for In (getting traffic and weather). Total cost: under $3,000, with no panel space consumed.

The Bottom Line

ADS-B Out is what you transmit—it’s legally required in most controlled airspace, and it must be certified equipment.

ADS-B In is what you receive—it’s optional but incredibly valuable, and portable receivers like Stratux offer a low-cost entry point.

If you’re flying in the mandate areas, you need Out. If you want better situational awareness (and who doesn’t?), adding In is one of the smartest investments you can make. And with options like Stratux starting under $400, there’s no reason to fly blind when the data is right there, free from the FAA.

Fly safe, fly informed.

Building your own Stratux ADS-B receiver is one of the most rewarding projects a pilot can tackle. Not only will you save money compared to commercial units, but you’ll gain a deep understanding of how ADS-B technology works—and you’ll have a device that’s fully repairable and upgradeable. Think of it as the Framework Laptop of aviation electronics.

In this comprehensive guide, we’ll walk you through every step of building a dual-band Stratux receiver from scratch. Whether you’re a seasoned DIYer or picking up a soldering iron for the first time, this guide has you covered.

What You’ll Need: Complete Parts List

Before you start, let’s talk budget. A complete DIY Stratux build costs between $210-230, depending on your choice of Raspberry Pi and where you source components. Here’s what you need:

Core Components:

• Raspberry Pi 4 or 5 ($35-55) — The Pi 4 2GB works great; Pi 5 offers better performance but isn’t required
• Stratux Parts Kit (~$175) — Available from Crew Dog Electronics, includes dual SDR receivers, antennas, GPS module, and fan
• MicroSD Card (32GB minimum, Class 10 or better) — This is your boot drive
• Case — Either 3D print your own or purchase a pre-made case from Crew Dog
• USB Power Cable — You’ll need reliable power in the cockpit

Optional but Recommended:

• AHRS Module — Adds attitude and heading information, though with limitations (more on that later)
• Battery Pack — For portable operation or backup power
• Improved Antennas — Stock antennas work fine, but upgraded antennas can improve range

Step 1: Prepare Your Raspberry Pi

Start by downloading the latest Stratux image from the official GitHub releases page. This is a pre-configured operating system that includes all the software you need. Use a tool like Balena Etcher or Raspberry Pi Imager to write the image to your microSD card.

Pro tip: Use a quality microSD card from a reputable brand (SanDisk, Samsung). Cheap cards are the #1 cause of Stratux failures.

Step 2: Assemble the Hardware

Now comes the fun part. Here’s the assembly sequence:

1. Install the microSD card into the Raspberry Pi’s slot on the bottom
2. Connect the SDR receivers to two USB ports — one handles 978 MHz UAT (US weather and traffic), the other handles 1090 MHz (Mode S transponders)
3. Attach the GPS module to the GPIO pins or via USB, depending on your model
4. Mount the cooling fan to the case or Pi — the SDRs generate heat, especially in summer cockpits
5. Connect the antennas to the SDR receivers — the shorter antenna is for 978 MHz, the longer for 1090 MHz
6. Secure everything in the case — make sure nothing can shake loose during turbulence

Common Assembly Mistakes to Avoid:

• Swapping the 978 and 1090 antennas (they’re similar but tuned differently)
• Forgetting thermal management — your Stratux needs airflow
• Using a low-quality USB power supply — the Pi needs 5V/3A minimum

Step 3: First Boot and Configuration

Power up your Stratux and wait about 60 seconds for it to boot. It will create a WiFi network called “stratux” (password: “stratux”). Connect your iPad or phone to this network, then open a web browser and navigate to http://192.168.10.1

The Stratux web interface lets you:

• Monitor GPS lock and satellite count
• See nearby aircraft and weather reception
• Configure settings like WiFi name and AHRS calibration
• Update firmware when new versions are released

First-flight checklist: Before you trust your Stratux in flight, verify GPS lock on the ground, confirm you’re receiving ADS-B traffic from nearby aircraft, and test the WiFi connection with your EFB app.

DIY vs Pre-Built: Is It Worth Building Your Own?

Let’s be honest about the trade-offs. A DIY build costs $210-230 and takes 2-3 hours. A pre-built Stratux from Crew Dog Electronics costs $379-449 but arrives ready to fly, with quality components, professional assembly, and a warranty.

Choose DIY if:

• You enjoy learning how things work
• You want maximum repairability — every component is user-replaceable
• You’re on a tight budget
• You might want to customize or experiment later

Choose pre-built if:

• You value your time and want to fly now
• You want professional build quality and support
• You’re not comfortable with electronics assembly
• You want the peace of mind of a warranty

Troubleshooting Your DIY Build

Most DIY builds work perfectly on the first try, but here are solutions to common issues:

No WiFi network appears: Wait a full 2 minutes for boot. Check that your Pi is getting power (look for LED lights). Try reflashing the SD card.

No GPS lock: Make sure the GPS module is properly connected. GPS needs a clear view of the sky—it won’t work indoors. Allow 5-10 minutes for the first lock.

No traffic reception: Verify your antennas are connected to the correct SDR. Make sure you’re in an area with ADS-B traffic (check flight tracking apps). The 1090 antenna should be on the R820T2 SDR.

Overheating: Ensure your fan is running and the case has ventilation holes. Consider adding heatsinks to the SDR dongles.

Next Steps: Integrating with Your EFB

Once your Stratux is built and tested, you’ll want to connect it to ForeFlight, Garmin Pilot, Avare, FlyQ, or your preferred EFB app. Most apps will auto-detect the Stratux via WiFi. In your app settings, look for “Devices” or “External GPS” and enable the connection.

Your newly built Stratux will provide:

• ADS-B traffic on both 978 and 1090 MHz
• FIS-B weather (NEXRAD, METARs, TAFs, TFRs, and more)
• GPS position and altitude
• AHRS attitude data (if equipped, though this has limitations compared to certified units)

The Bottom Line

Building a DIY Stratux is a satisfying weekend project that pays dividends every time you fly. You’ll have a capable ADS-B receiver that you fully understand and can maintain indefinitely. And if anything ever breaks? You can fix it yourself or order a replacement part for a few dollars.

That’s the beauty of open-source aviation electronics. You’re not locked into a proprietary ecosystem. You’re not stuck waiting for manufacturer support. You built it, you own it, and you can keep it flying for years to come.

Ready to get started? Grab a Stratux parts kit from Crew Dog Electronics and join the thousands of pilots who’ve discovered the joy of DIY ADS-B.

Blue skies and happy building!

You’ve just unboxed your new Stratux ADS-B receiver, and you’re ready to see real-time traffic and weather on your iPad. Great choice! But if you’ve never connected an ADS-B receiver to ForeFlight before, the setup might seem intimidating.

Don’t worry—it’s easier than programming your GPS. In this guide, we’ll walk you through the entire process, from unboxing to your first flight with live traffic and FIS-B weather.

What You’ll Need

• Your Stratux receiver (charged or charging)
• iPad or iPhone with ForeFlight installed
• About 10 minutes

Note: This guide focuses on ForeFlight, but the process is nearly identical for FltPlan Go, iFly GPS, Avare, and other EFB apps. The Stratux WiFi network and settings interface work the same regardless of which app you use.

Step 1: Charge Your Stratux

Before your first use, charge the Stratux’s internal battery. Plug the included USB cable into any USB power source (wall adapter, computer, power bank) and connect it to the Stratux’s charging port.

Charging indicators:

• Red LED: Charging in progress
• Green LED: Fully charged

A full charge takes 2-3 hours and provides 4-6 hours of runtime, depending on configuration and temperature. You can also run the Stratux while charging if you have in-flight power available.

Step 2: Power On Your Stratux

Press and hold the power button for 2-3 seconds. You’ll see LEDs light up as the Raspberry Pi boots—this takes about 30-45 seconds.

What’s happening: The Stratux is starting its Linux-based operating system, initializing the GPS module, and firing up the SDR receivers for 1090ES and 978 UAT.

Be patient during the first boot—it may take slightly longer as the system initializes for the first time.

Step 3: Connect to the Stratux WiFi Network

Once the Stratux is fully booted (all LEDs stabilize), it broadcasts a WiFi network named “stratux” (or a custom name if you’ve renamed it).

On your iPad:

1. Open Settings → WiFi
2. Look for the network named stratux
3. Tap it to connect
4. If prompted for a password, the default is “stratux” (all lowercase)

You’ll see a checkmark next to “stratux” when connected. Your iPad may warn you that there’s no internet connection—that’s normal. The Stratux is a local network for ADS-B data, not an internet hotspot.

Pro Tip: Disable Auto-Join for Other Networks

To prevent your iPad from jumping to a different WiFi network mid-flight, go to Settings → WiFi, tap the (i) icon next to other networks (like your home WiFi), and disable Auto-Join. This ensures your iPad stays connected to the Stratux.

Step 4: Open ForeFlight and Enable ADS-B

Now that you’re connected to the Stratux WiFi, it’s time to configure ForeFlight.

1. Open ForeFlight
2. Tap More (bottom right) → Devices
3. Under “ADS-B Receivers,” you should see Stratux listed
4. Tap Stratux to select it

ForeFlight will now listen for data from the Stratux. You should see:

• GPS: Green indicator once the GPS has a fix (may take 1-2 minutes outdoors)
• AHRS: Green indicator (provides attitude data for synthetic vision)
• ADS-B Traffic: Will show traffic count once aircraft are detected
• Weather: Will populate with FIS-B data (requires ADS-B ground station in range)

Don’t panic if you don’t see traffic or weather immediately—you need to be outdoors with a clear view of the sky, and preferably in flight or at an airport with ADS-B coverage.

Step 5: Position Your Stratux for Best Reception

For optimal performance, position your Stratux with:

• Antennas pointing up toward the sky (not sideways or down)
• Clear view of the sky—avoid placing it under metal instrument panels or in baggage compartments
• Away from electronic interference—keep it away from other radios, iPads, and power supplies if possible

Ideal mounting locations:

• Glareshield (top of the panel, near the windscreen)
• Passenger seat with antennas up
• Window mount (suction cup or Velcro)

The better the antenna position, the more traffic you’ll see and the faster your GPS will lock.

Step 6: Check the Stratux Web Interface

The Stratux has a built-in web interface for monitoring status and adjusting settings. This is optional but incredibly useful.

To access it:

1. Make sure you’re connected to the Stratux WiFi
2. Open Safari (or any browser) on your iPad
3. Go to: http://192.168.10.1

You’ll see the Stratux status page with real-time info:

• GPS status: Satellite count, position accuracy
• ADS-B traffic: Number of aircraft being tracked
• Weather (FIS-B): Data products being received
• Uptime and system info

This is your diagnostic dashboard. If something isn’t working, check here first.

Step 7: Go Fly!

You’re all set. Take your iPad and Stratux to the airport, power everything on, connect to the Stratux WiFi, and launch ForeFlight.

In flight, you’ll see:

• Traffic icons on the map showing nearby aircraft with altitude, direction, and vertical trend
• FIS-B weather overlays (NEXRAD, METARs, TAFs, winds aloft, etc.)
• GPS-derived position and AHRS-derived attitude for synthetic vision

Your first time seeing live traffic pop up on the map is a game-changer. You’ll wonder how you ever flew without it.

Tips for Best Performance

1. Let the GPS Warm Up

GPS can take 1-2 minutes (or longer) to acquire a fix on the first power-on, especially indoors or under a hangar roof. Be patient. Once it locks, subsequent startups are much faster.

2. Update Firmware Regularly

The Stratux community releases firmware updates with bug fixes and new features. Check GitHub or the Stratux web interface for updates. Updating is as simple as uploading a new image file via the web interface.

3. Keep Antennas Vertical

ADS-B signals are polarized. Keeping your antennas vertical maximizes reception. If you’re consistently missing traffic, check your antenna orientation first.

4. Monitor Battery Life

Check the Stratux web interface or ForeFlight’s Devices page to monitor battery percentage. If you’re on a long cross-country, bring a USB power bank or plug into ship power.

Troubleshooting Common Issues

WiFi Network Not Appearing

• Solution: Make sure the Stratux is fully booted (wait 45-60 seconds after powering on). If the network still doesn’t appear, the SD card may need reflashing. Download the latest Stratux image from GitHub and reflash using a tool like Balena Etcher.

No GPS Fix

• Solution: Move outdoors with a clear view of the sky. GPS doesn’t work well indoors or under metal roofs. If it still won’t lock after 5 minutes outside, the GPS module may be loose or faulty. Check connections or contact Crew Dog Electronics for a replacement module.

No Traffic Showing

• Solution:
  1. Check the Stratux web interface to confirm the SDR receivers are active
  2. Make sure you’re in an area with ADS-B Out-equipped aircraft (towered airports are best for testing)
  3. Verify antenna connections—loose antennas = no reception
  4. Check antenna orientation (should point up)

No Weather (FIS-B)

• Solution: FIS-B is broadcast by ADS-B ground stations on 978 UAT. You need to be within range of a ground station (typically within 200nm of major airports at altitude). If you’re in a remote area or flying low, you may not receive FIS-B. This is normal—it’s not a Stratux issue.

ForeFlight Not Detecting Stratux

• Solution:
  1. Confirm you’re connected to the Stratux WiFi (not cellular or another network)
  2. Close and reopen ForeFlight
  3. Go to More → Devices and manually select Stratux
  4. If still not working, restart both the iPad and the Stratux

Maintenance and Care

Your Stratux is designed to be durable, but a little care goes a long way:

• Keep it cool: Don’t leave it in a hot cockpit for extended periods. Heat degrades battery life.
• Protect from moisture: The Stratux isn’t waterproof. Keep it dry.
• Update firmware: Check for updates every few months.
• Replace parts as needed: If something fails, replacement parts are available. Don’t throw away the whole unit for a $20 component.

Final Thoughts

Setting up your Stratux with ForeFlight is straightforward: charge it, connect to the WiFi, enable it in ForeFlight, and fly. Within minutes, you’ll have live traffic and weather at your fingertips—no subscription required.

The first time you see a jet pass overhead and watch it move across your ForeFlight screen in real time, you’ll understand why ADS-B In is one of the best safety upgrades in modern GA flying.

Questions? Need help? Check out the Stratux GitHub for community support, or reach out to Crew Dog Electronics—we’re pilots too, and we’re here to help.

Fly safe, and enjoy your new eyes in the sky.

If you’ve been flying in the United States since January 1, 2020, you’ve encountered the FAA’s ADS-B mandate—whether you realized it or not. But what exactly is ADS-B, and why has it become such a critical piece of modern aviation technology?

In this comprehensive guide, we’ll break down everything you need to know about Automatic Dependent Surveillance-Broadcast (ADS-B), from how it works to why you need an ADS-B In receiver in your cockpit.

Understanding ADS-B: The Basics

ADS-B stands for Automatic Dependent Surveillance-Broadcast. Let’s unpack that mouthful:

• Automatic: No pilot or external input required—it broadcasts continuously
• Dependent: Relies on aircraft systems (GPS, primarily) for position data
• Surveillance: Provides real-time aircraft tracking
• Broadcast: Transmits information openly for anyone equipped to receive it

Think of ADS-B as your aircraft constantly announcing, “Here I am, here’s where I’m going, and here’s how fast I’m moving.” It’s replaced traditional radar as the FAA’s primary surveillance method for air traffic control.

ADS-B Out vs. ADS-B In: What’s the Difference?

ADS-B Out: The Mandate

ADS-B Out is what the FAA requires. Since January 1, 2020, all aircraft flying in most controlled airspace must broadcast their position, altitude, velocity, and other data. This is what ATC uses to track you—no more depending solely on ground-based radar.

Required for:

• Class A, B, and C airspace
• Class E airspace at or above 10,000 feet MSL (excluding airspace at and below 2,500 feet AGL)
• Class E airspace over the Gulf of Mexico at and above 3,000 feet MSL
• Within 30 nautical miles of certain Class B airports (the “Mode C veil”)
• Above the ceiling and within the lateral boundaries of Class B or Class C airspace

ADS-B In: The Game-Changer

ADS-B In is optional, but it’s where the magic happens for pilots. An ADS-B In receiver allows you to:

• See traffic: View other ADS-B Out-equipped aircraft on your tablet or panel-mount display
• Get free weather: Receive Flight Information Service-Broadcast (FIS-B) weather data in real time
• Improve situational awareness: Know what’s around you without calling ATC

Here’s the key: you don’t need ADS-B Out to benefit from ADS-B In. A portable receiver like Stratux gives you traffic and weather even if you’re flying a vintage taildragger with no electrical system beyond a handheld radio.

1090ES vs. 978 UAT: The Two Frequencies

ADS-B operates on two frequencies in the United States:

1090 MHz Extended Squitter (1090ES)

• International standard used worldwide
• Required for aircraft flying above 18,000 feet (Class A airspace)
• Used by all commercial airliners and most turbine aircraft
• Traffic only—no weather broadcast on this frequency

978 MHz Universal Access Transceiver (978 UAT)

• U.S.-only frequency
• Available for aircraft operating exclusively below 18,000 feet
• Carries both traffic and FIS-B weather data
• Popular with general aviation pilots

Why dual-band matters: If you only receive 978 UAT, you’ll miss all the airliners and jets on 1090ES. If you only receive 1090ES, you’ll miss GA traffic on 978 UAT and you won’t get FIS-B weather. A dual-band receiver like the Stratux Dual Band receives both frequencies, giving you complete coverage.

FIS-B: Free Weather in Your Cockpit

One of ADS-B In’s best features is FIS-B (Flight Information Service-Broadcast). This service provides real-time weather data at no cost:

• METARs and TAFs
• NEXRAD radar imagery (regional and CONUS)
• PIREPs
• Winds and temperatures aloft
• NOTAMs and TFRs
• AIRMETs and SIGMETs
• Lightning data

FIS-B is broadcast on 978 UAT and updated every 5 minutes for most products. It’s not a substitute for a preflight weather briefing, but it’s invaluable for in-flight decision-making.

Why Every Pilot Should Consider an ADS-B In Receiver

Even if your aircraft is already ADS-B Out compliant, adding an ADS-B In receiver transforms your situational awareness:

1. See and avoid: Traffic awareness is the best collision avoidance tool you can have. ADS-B In shows you traffic with precise position, altitude, and trend data.
2. Weather awareness: Watching a line of storms develop in real time beats guessing based on a 2-hour-old briefing.
3. Cost-effective: Portable receivers like Stratux cost a fraction of panel-mount systems and work with apps you already use (ForeFlight, FltPlan Go, iFly GPS, etc.).
4. No subscription required: Unlike XM Weather or other satellite-based services, FIS-B is free. Forever.

Getting Started with ADS-B In: Stratux

If you’re ready to add ADS-B In to your cockpit, the Stratux receiver from Crew Dog Electronics is an affordable, proven solution. It’s an open-source receiver trusted by thousands of pilots, offering dual-band reception, WAAS GPS, and compatibility with all major EFB apps.

Best of all? It’s fully user-serviceable. Every component is replaceable, so you’re never grounded by a failed part. GPS module dies? Swap it yourself for $20. Compare that to sealed commercial units that require factory repair or replacement.

Check out the replacement parts section to see just how repairable your Stratux is.

Conclusion

ADS-B has fundamentally changed how we fly. ADS-B Out keeps you legal and visible to ATC. ADS-B In keeps you aware—of traffic, weather, and the airspace around you. Whether you fly a Cessna 150 on sunny Saturday mornings or a Cirrus on IFR cross-countries, an ADS-B In receiver is one of the smartest investments you can make.

The airspace is more crowded than ever. Make sure you can see what’s out there.