Simplified Installation

One of the aspects that often intimidates newcomers to Linux is the installation process, which is frequently perceived as complex. With Hamlinux, I have tried to make installation as straightforward as possible: very few decisions, all clearly explained, and within just a few minutes the system is ready to use.

Headless Operation

In portable operation, one of the main challenges is managing a display and keyboard. Compared to a computing unit no larger than a power bank, traditional solutions are often bulky and impractical. For this reason, I chose a completely headless approach, meaning operation without a dedicated monitor or keyboard.

The Raspberry Pi version of Hamlinux automatically detects the absence of a keyboard during boot and enables headless mode without requiring any user intervention.

Remote Access

For portable operation, I find a tablet to be the ideal graphical terminal: lightweight, compact, touchscreen-based, energy efficient, and easily powered from a 12 V source. In a fixed station, where portability constraints do not apply, being able to access the radio station controller’s desktop remotely over the network is equally convenient.

Both versions include all the services required for remote access. The protocol used is RDP, which is supported by virtually all modern operating systems.

This approach eliminates the need for dedicated display hardware, reduces the load on the primary power source, and allows even very compact systems to be used comfortably. RDP clients also provide considerable flexibility in screen management.

It is even possible to use very old devices: for example, I still successfully use a 2010 Galaxy Tab GT-P1000 running Android 3 with the aRDP Free client.

Naturally, when paired with a larger, more capable tablet and an external Bluetooth keyboard, the user experience becomes comparable to that of a traditional laptop.

Integrated Wi-Fi Hotspot

When the system boots in headless mode, Hamlinux automatically enables a local Wi-Fi hotspot and starts the services required for remote access.

The hotspot uses HAMLINUX as the default SSID, while the password is the same as the one configured for the primary user account during installation.

If the Raspberry Pi is connected to a wired network with Internet access, or to a smartphone providing USB tethering, Hamlinux automatically operates as a router, allowing all devices connected to the hotspot to access the network.

Since the system is designed to operate without a display, the Raspberry Pi’s green ACTIVITY LED is used to indicate boot completion and operational status.

Two short flashes followed by a one-second pause indicate that the hotspot and remote services are active. A regular flash every half second indicates normal operation with no hotspot enabled.

The x64 version does not provide automatic headless mode, but remote services can be enabled or disabled through a dedicated menu option.

Clock and Time Synchronization

Modern weak-signal digital modes such as FT8, WSPR, JT65, and similar protocols require an extremely accurate time reference. An offset of even a single second can completely prevent signal decoding.

Older Raspberry Pi models do not include a hardware Real-Time Clock (RTC) and rely on the network to obtain the correct time. Although both Raspberry Pi 5 and conventional PCs include quartz-based RTCs, these clocks drift over time and do not provide the accuracy required by weak-signal modes.

For the Raspberry Pi version, designed primarily for portable operation, I therefore integrated a GPS receiver to make the system completely autonomous while maintaining high accuracy. The GPS is used both to determine geographical position and as a time reference source.

Both versions implement a synchronization subsystem based on the Network Time Protocol (NTP), the standard mechanism used by operating systems to maintain accurate time.

More information is available...