Blog – BradleyCIT

Setting Up an ADS-B Receiver on a Raspberry Pi: A Secure and Efficient Home Project

Hey everyone! If you’re into aviation, tracking flights, or just tinkering with tech, I’ve got an exciting project to share. I recently set up a Raspberry Pi as an ADS-B receiver using the ADS-B.im software, and it’s been feeding data to sites like FlightAware and Flightradar24. Not only is this a fun way to contribute to global flight tracking, but I also went the extra mile to make it secure with VLANs and proper networking. In this post, I’ll break down what ADS-B is, why I isolated it on a dedicated VLAN, the hardware setup with switches and PoE, and the security benefits. Let’s dive in!

What is ADS-B?

ADS-B stands for Automatic Dependent Surveillance-Broadcast. It’s a modern surveillance technology used in aviation where aircraft equipped with ADS-B transponders automatically broadcast their position, altitude, speed, and other data via satellite navigation (like GPS). This information is transmitted every second or so on the 1090 MHz or 978 MHz frequencies.

Unlike traditional radar, which relies on ground-based stations pinging aircraft, ADS-B is “dependent” on the aircraft itself to provide the data. Ground receivers—like the one I built with a Raspberry Pi—can pick up these signals using a simple antenna and SDR (Software Defined Radio) dongle. The data gets decoded and can be shared with flight tracking networks, helping enthusiasts, airports, and even airlines monitor air traffic in real-time.

It’s a game-changer for safety and efficiency in aviation, and hobbyists like me can contribute by running feeders. My setup uses ADS-B.im, a user-friendly software suite that’s optimized for Raspberry Pi and handles everything from signal decoding to uploading feeds to multiple services.

[Placeholder for Photo: Close-up of the Raspberry Pi with SDR dongle and antenna attached]

Recommended SDR Dongles and Antennas

To get started with an ADS-B receiver, you’ll need at least one RTL-SDR dongle and a good 1090 MHz antenna (most aircraft use 1090 MHz internationally; 978 MHz is mainly for UAT in the US). Here are three solid options available on Amazon that work great with ADS-B.im or similar software:

1. RTL-SDR Blog V4 Dongle – A highly recommended general-purpose SDR with excellent performance, TCXO for stability, and SMA connector. Great for ADS-B and beyond.
Link to Amazon

2. Nooelec NESDR Smart v5 – Premium RTL-SDR with aluminum enclosure, low-noise design, and TCXO. Compact and reliable for ADS-B feeding.
Link to Amazon

3. AirNav RadarBox FlightStick – Optimized specifically for ADS-B with built-in amplifier and filter for better range and signal quality.
Link to Amazon

For antennas, pair them with a dedicated 1090 MHz model for best results:

• A popular outdoor fiberglass antenna tuned for ADS-B: FlightAware-style 1090 MHz Antenna

[Placeholder for Photo: Examples of SDR dongles and antennas]

Why VLANs and Isolated Networking? The Security Angle

When dealing with IoT devices like a Raspberry Pi running specialized software, security is paramount. ADS-B receivers connect to the internet to upload data to services like FlightAware, Flightradar24, ADS-B Exchange, and others. This means they’re exposed to potential remote access or vulnerabilities—think outdated software, weak passwords, or even exploits in the feeding protocols.

To mitigate this, I set up a dedicated VLAN (Virtual Local Area Network) in my pfSense router/firewall. VLANs allow you to segment your network logically, even on the same physical hardware. In simple terms, a VLAN is like creating separate “lanes” on your network highway, where traffic in one lane doesn’t mix with another unless you explicitly allow it.

Here’s why this matters for security:

• Isolation from Main LAN: My home network has computers, smart devices, and family stuff. By putting the ADS-B Pi on its own VLAN, I prevent any potential compromise on the Pi from spreading to my main network. For example, if there’s a vulnerability in the ADS-B software or a feeder service gets hacked, it can’t access my personal files or other devices.

• Controlled Internet Access: The VLAN is configured in pfSense to allow outbound traffic (for feeding data) but block inbound connections except what’s necessary. This reduces the attack surface—no random ports open to the world.

• Traffic Management: ADS-B data can be chatty, and separating it keeps my main LAN snappy. Plus, it makes monitoring easier; I can apply specific firewall rules just for this VLAN.

pfSense is fantastic for this because it’s open-source and powerful—setting up a VLAN is as easy as assigning a tag (like VLAN 10) to an interface and creating rules.

The Hardware Setup: Switches, PoE, and Rack Mounting

To get the VLAN from my pfSense router to the Raspberry Pi, I used a couple of managed switches for reliable forwarding.

• Main Switch: I have a 24-port managed switch (something like a Ubiquiti or similar—check your model for VLAN support) connected to pfSense. This switch handles the initial VLAN tagging and forwards the isolated traffic.

• Secondary Switch: From there, it connects to an ES-205GP (I assume you meant ES-205GP or similar; it’s a compact Gigabit PoE switch). This little guy is perfect for edge setups—it supports VLAN passthrough and provides Power over Ethernet (PoE).

The ES-205GP powers the Raspberry Pi via a PoE HAT (Hardware Attached on Top). PoE is awesome because it sends both data and power over a single Ethernet cable—no separate power adapter needed. This keeps things tidy and reliable, especially in a rack.

Everything is housed in a 1U rack mount enclosure. The Pi with its PoE HAT and the ES-205GP fit snugly, making it a compact, professional-looking setup. I ran a Cat6 cable from the 24-port switch to the ES-205GP, ensuring the VLAN is trunked (allowed to pass through) on the ports.

Once powered up, the ADS-B.im software on the Pi decodes incoming signals from the antenna and pushes data to the feeders. It’s been rock-solid, contributing to multiple networks without a hitch.

[Placeholder for Photo: The 1U rack mount with Raspberry Pi, ES-205GP switch, and cabling]

[Placeholder for Photo: Diagram of the network flow – pfSense > 24-port switch > ES-205GP > Raspberry Pi]

Wrapping It Up

This ADS-B setup has been a rewarding project—it’s low-cost, contributes to the aviation community, and teaches a ton about networking and security. If you’re thinking of building one, start with ADS-B.im for the software, grab a Raspberry Pi 4 or 5, one of the SDRs above, and a tuned antenna. And don’t skip the VLANs; in today’s connected world, segmenting your network is a smart move.

Have you set up an ADS-B receiver? Share your tips in the comments! If you have questions about my config, hit me up.

Thanks for reading!

BradleyCIT

P.S. Pictures coming soon.

# From Mechanic to Tech: Building My First Website with AI

## From Under the Hood to Under the Hood (of the Internet)

For years, I’ve been a mechanic. I know my way around an engine, can diagnose a failing transmission by sound alone, and I’m pretty confident I can fix just about anything with four wheels. But lately, I’ve been feeling the pull toward something different—something that’s been on my mind every time I see the digital world expanding around us.

I want to break into tech.

Now, I’ll be honest: I don’t have a computer science degree. I haven’t spent years learning to code in a classroom. But what I *do* have is the same problem-solving mindset that’s helped me troubleshoot countless car issues, a curiosity to learn, and something that’s leveling the playing field for people like me—**AI**.

## Why I’m Making the Transition

The parallels between mechanics and tech are more similar than you might think. Both require:
– **Diagnostic thinking** – identifying problems and working through solutions systematically
– **Attention to detail** – one misplaced bolt or one wrong line of code can break everything
– **Continuous learning** – cars evolve, technology evolves, and you either keep up or get left behind

The difference? Tech doesn’t leave grease under your fingernails (though it might leave you debugging until 2 AM).

But seriously, I’m making this shift because I see where the world is heading. I want to build things that can reach people everywhere, not just the customers who pull into the shop. I want to create solutions, learn new skills, and prove that you don’t need a traditional tech background to make it in this industry.

## My First Real Project: Dachshund.Name

So here’s where things get real. I decided the best way to learn was to just *build something*.

I created Dachshund.name – a simple name generator for Dachshund owners looking for the perfect name for their pup.

**Why a Dachshund name generator?** Honestly, why not? It’s fun, it’s useful for a specific community, and it gave me a clear goal to work toward. Plus, I’ve always loved dachshunds.

### How I Built It (With AI as My Co-Pilot)

Here’s the truth: I used AI to help me build this site. Not because I’m looking for shortcuts, but because AI has become an incredible learning tool. It’s like having a mentor available 24/7 who can explain concepts, help debug issues, and guide you through problems.

Here’s what I learned building this project:

**1. Domain Setup & Hosting**
Getting a domain name, setting up hosting, understanding DNS – these were all new concepts for me. AI helped me understand what I needed and why, walking me through each step like a patient teacher.

**2. Front-End Development**
I learned about HTML, CSS, and JavaScript – the building blocks of websites. Every time I got stuck (which was often at first), I’d ask AI to explain what was happening and why. It’s like having a shop manual, but one that can answer your specific questions.

**3. User Experience**
I learned to think about how people would actually *use* the site. How do I make it intuitive? What features matter? It’s not that different from thinking about how a driver interacts with their vehicle, actually.

**4. Problem-Solving**
When something didn’t work (and trust me, plenty didn’t work at first), I had to debug it. That mechanic’s mindset kicked in: isolate the problem, test different solutions, figure out what’s causing the issue.

## What I’m Learning About AI and Tech

Using AI to learn tech isn’t about having the AI do everything for you. It’s about:
– **Understanding the fundamentals** so you know what questions to ask
– **Learning the “why” behind the code**, not just copying and pasting
– **Building practical projects** that force you to apply what you’re learning
– **Iterating and improving** – my first version wasn’t perfect, and that’s okay

## The Mechanic’s Advantage in Tech

Here’s something I’m realizing: being a mechanic has actually *prepared* me for tech in ways I didn’t expect.

**Systems thinking**: A car is a complex system of interconnected parts. A website or application is the same thing – just digital.

**Documentation skills**: Ever kept detailed service records? That’s basically what commenting your code is.

**Client communication**: Explaining technical problems to non-technical people? I’ve been doing that for years when customers ask what’s wrong with their car.

**Persistence**: Some problems take hours to solve. Whether it’s finding an electrical short or debugging code, you don’t give up until it works.

## What’s Next

This is just the beginning. Dachshund.Name is my first project, but it won’t be my last. I’m learning more every day, building more projects, and getting more comfortable with the tools and technologies that run our digital world.

My goals moving forward:
– Build more web applications with increasing complexity
– Learn back-end development and databases
– Understand APIs and how different services connect
– Eventually, land a job in tech where I can contribute real value

## For Anyone Else Thinking About Making a Career Change

If you’re reading this and you’re in a similar position – maybe you’re in a trade, maybe you’re in a completely different field, maybe you’re just curious about tech but feel like you’ve “missed the boat” – let me tell you: **you haven’t**.

The barrier to entry is lower than it’s ever been. The tools (like AI) are better than they’ve ever been. And the demand for people who can solve problems and build things is higher than it’s ever been.

You don’t need permission to start learning. You don’t need a degree to build something. You just need curiosity, persistence, and the willingness to be uncomfortable while you figure things out.

So yeah, I’m a mechanic learning tech. And I’m documenting the whole journey.

Check out Dachshund.name and let me know what you think. It’s simple, but it’s mine, and it’s proof that anyone can start building.

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*Want to follow my journey from mechanic to tech? Subscribe to the blog for updates on new projects, lessons learned, and honest reflections on making a career transition into technology.*

**What about you? Are you making a career change? Drop a comment below – I’d love to hear your story.**