{"id":595,"date":"2025-11-21T10:07:25","date_gmt":"2025-11-21T09:07:25","guid":{"rendered":"https:\/\/www.hamlinux.it\/en\/?page_id=595"},"modified":"2025-12-07T17:06:57","modified_gmt":"2025-12-07T16:06:57","slug":"hamradio","status":"publish","type":"page","link":"https:\/\/www.i8zse.it\/en\/radio\/hamradio\/","title":{"rendered":"Hamradio"},"content":{"rendered":"

The radio is one of the most fascinating and enduring inventions in the history of technology. Born at the dawn of the twentieth century, in an era when long-distance communication was still tied to telegraph wires, the radio made it possible to transmit information without a physical connection, exploiting the ether \u2013 that immense invisible space that today we fill with signals, voices, and data.
\nWithin this long history lies amateur radio, the activity carried out by radio amateurs: people who, out of passion and technical curiosity, explore the means of radio communication, experiment with new technologies, and keep alive the culture of self-construction and scientific discovery.<\/p>\n

Radio as a tool of knowledge<\/h2>\n

\"Shack\"<\/a><\/h2>\n

At first glance, radio may seem like a medium of the past, surpassed by the internet, mobile telephony, and social networks. In reality, radio is an extraordinarily alive and versatile technology, which has evolved alongside advances in electronics and computer science.
\nThe radio amateur is not a simple \u201cradio talker\u201d: they are a researcher, a technician, an explorer of the ether. They study how radio waves propagate, experiment with new modulations, build antennas and receiving devices, develop software to decode signals and optimize transmissions.
\nAmateur radio is a technical training ground that unites theory and practice, a place where physics, electronics, and computer science meet.<\/p>\n

Radio waves and the invisible language of the ether<\/h2>\n

At the base of everything lies a simple but powerful concept: an electrical signal, varied over time, can be radiated into space in the form of electromagnetic waves.
\nThese waves travel at speeds close to that of light, cross immense distances, and can reflect, scatter, or be absorbed depending on the frequency and atmospheric or ionospheric conditions.
\nThe world of radio amateurs moves across a wide spectrum ranging from long waves (kHz) to microwaves (GHz). Each band has its own propagation characteristics: there are frequencies that bounce off the atmosphere and allow intercontinental connections with minimal power, and higher frequencies that behave almost like light, requiring optical visibility between points in contact.<\/p>\n

From analog to digital<\/h2>\n
\"RTTY<\/a>
An RTTY modem for C64 that I self-built in 1985<\/figcaption><\/figure>\n

For decades, radio communication was analog: voice or telegraphy signals were transmitted by modulating the amplitude or frequency of a carrier wave. However, with the advent of computers and digital techniques, radio experienced a new revolution.
\nToday, much of amateur radio activity takes place digitally, through signals composed of sequences of bits representing encoded information.
\nThis change is not only technological but also cultural: radio has become a bridge between the world of classical electronics and that of computer science.<\/p>\n

Digital modulations \u2013 such as PSK, FSK, QPSK, or OFDM \u2013 allow information to be transmitted more efficiently and with less susceptibility to interference. Moreover, digital signal processing makes it possible to extract information even from extremely weak signals, often imperceptible to the human ear.
\nThanks to protocols such as FT8 or JS8Call, today it is possible to make contacts thousands of kilometers away with just a few watts of power, exploiting synchronization and error correction algorithms that compensate for the variability of the ether.<\/p>\n

The new frontiers<\/h2>\n

One of the most important developments in recent years is Software Defined Radio (SDR).
\nTraditionally, a radio receiver or transmitter was built with specific circuits for each function: filters, oscillators, demodulators, amplifiers. SDR overturns this paradigm: much of the signal processing takes place in software, thanks to high-speed analog\/digital converters.
\nThis means that the same hardware can become, depending on the program used, an HF receiver, a spectrum analyzer, a digital decoder, or an automatic repeater.
\nIn this context, radio becomes an IT tool, programmable and flexible, open to innovation and integration with the world of computers and networks.<\/p>\n

Alongside SDR, digital amateur radio networks have spread, connecting stations and repeaters via the Internet, creating true \u201chybrid networks\u201d between ether and IP.
\nSystems such as D-STAR, DMR, and Yaesu Fusion allow combining the immediacy of radio with the reliability of data networks.
\nThe modern radio amateur, therefore, no longer operates only \u201cin the ether,\u201d but moves in a hybrid ecosystem where radiofrequency and computer science coexist.<\/p>\n

Experimentation as a driving force<\/h2>\n

What distinguishes the radio amateur from the user of a normal communication device is the experimental approach.
\nIt is not enough to \u201ctalk on the radio\u201d: the radio amateur wants to understand how and why a signal arrives, how to improve its quality, how to build more efficient antennas or more robust systems.
\nInternational regulations recognize this vocation: the bands assigned to the amateur radio service are spaces dedicated to experimentation and technical training.
\nIn many cases, discoveries or innovations born in the amateur field \u2013 such as satellite communication, packet radio networks, or the first mesh network experiments \u2013 anticipated developments later adopted in the professional and commercial world.<\/p>\n

Radio in the 21st century: between Earth and space<\/h2>\n
\"Oscar<\/a>
The record-breaking satellite Oscar 7<\/figcaption><\/figure>\n

Another fascinating field is amateur satellite communications.
\nFor decades, amateur radio organizations have built and managed small satellites (the so-called OSCAR), accessible to anyone with the appropriate equipment. One of our satellites, Oscar 7, launched in 1974, is currently the longest-lived operational satellite in orbit, with over 50 years of activity.
\nThese satellites orbit the Earth and enable intercontinental connections even with small antennas and minimal power.
\nIn recent years, the miniaturization of electronics and the reduction of costs have made it possible to send experimental microsatellites and CubeSats, often designed by universities and amateur radio associations.<\/p>\n

At the same time, digital techniques have enabled the birth of innovative communication modes, such as internet radio (Echolink, AllStarLink) or network-defined radio (WebSDR), which \u2013 although in my opinion somewhat distort amateur radio activity \u2013 allow receiving or transmitting signals from anywhere in the world, controlling a remote station through the web.
\nAll this keeps curiosity and the spirit of experimentation alive, adapting it to the contemporary technological context.<\/p>\n

Amateur radio and digital culture<\/h2>\n

Modern amateur radio is also an extraordinary training ground for those approaching technology as self-taught.
\nStudying and practicing radio means experiencing firsthand concepts of electromagnetism, electronics, digital coding, communication protocols, and computer networks.
\nMany professionals in IT, telecommunications, or cybersecurity \u2013 and the author of these lines is an example \u2013 started out precisely as radio amateurs: radio offers a concrete laboratory where theory and practice meet, where it is possible to see (and hear) physics in action.<\/p>\n

Today, with just a few components and a computer, it is possible to receive the entire radio spectrum \u2013 from broadcast transmissions to weather sondes, up to signals from weather satellites or space stations.
\nInterest in radio hacking, signal analysis, and digital decoding intertwines with amateur radio ethics, based on knowledge sharing and respect for technical and legal rules.
\nIn a world where everything seems invisible and automated, radio gives us back the awareness that behind every communication there are real waves, energy, and knowledge.<\/p>\n

The human dimension<\/h2>\n

\"cq\"<\/a><\/p>\n

We must not forget, finally, that radio is also human communication.
\nBehind every connection, behind every \u201cCQ\u201d call, there is a person who answers.
\nAmateur radio networks are activated in cases of emergencies, disasters, or interruptions of conventional communications, providing support and coordination where other systems fail.
\nThis aspect of service to the community is a pillar of amateur radio and one of the reasons why the activity is recognized and regulated internationally.<\/p>\n

Experimentation, knowledge, and freedom<\/h2>\n

Amateur radio is a free space.
\nNot free in the sense of \u201cwithout rules\u201d: amateur radio activity is regulated worldwide by international agreements and national laws that establish frequencies, power levels, and usage modes.
\nTo operate as a radio amateur it is not enough to purchase a device: it is necessary to pass a qualification exam, which verifies basic knowledge of electronics, propagation, and regulations, and obtain an official license issued by the competent authority (in Italy, the Ministry of Enterprises and Made in Italy).
\nWith the license a personal callsign is assigned, a unique identifier recognized internationally \u2013 a sort of \u201cradio plate\u201d that accompanies the operator in all their activities.
\nThis regulation ensures that amateur radio communications take place in an orderly, safe way and with respect for the assigned bands, while at the same time allowing the technical and scientific experimentation that has always been at the heart of amateur radio.
\nBeyond this entry barrier, which is justified by the use of a non-trivial technical medium, it is a completely free world in the highest sense of the term: free to learn, to build, to share.
\nThe radio amateur does not only buy equipment: they understand it, modify it, measure its performance, and discuss it publicly.
\nIt is the same spirit that animates the open-source world: knowledge as a common good, experimentation as a method, collaboration as a force.<\/p>\n

With Linux and free tools, radio returns to being what it was at the origin: a field open to creativity.
\nFrom a simple digital QSO to building network nodes, from weather monitoring to amateur space missions, everything becomes accessible.
\nFree software does not impose limits but opens doors wide: every program can be analyzed, adapted, and improved, just like a self-built radio circuit.<\/p>\n

Radio as a bridge between worlds<\/h2>\n
\"handshake\"<\/a>
photo by Mart Productions \u2013 Pexels<\/figcaption><\/figure>\n

In an era of invisible connections and increasingly closed services, radio represents a rare space of independence.
\nA radio signal does not pass through commercial servers, does not require a subscription, does not depend on external infrastructures: it is a direct link between people.
\nThis spirit of freedom, of technical autonomy, is the same that fueled the birth of Linux and the open-source movement.<\/p>\n

HamLinux wants to keep this bridge between worlds alive: between electronics and software, between science and passion, between the analog past and the digital future.
\nBecause radio, even today, is one of the purest forms of communication: invisible, universal, and profoundly human.<\/p>\n

Recap<\/h2>\n

Amateur radio is much more than a technical hobby: it is a universal language that unites generations, cultures, and skills.
\nIt is an open window on the ether, where physics, electronics, and computer science merge to create something concrete, measurable, human.
\nIn the transition from analog to digital, radio has demonstrated an extraordinary capacity for adaptation, becoming fertile ground for scientific experimentation and technical training.<\/p>\n

Those who approach radio today discover a world that dialogues with open source, free hardware, and global connectivity.
\nThey discover that \u201cdoing radio\u201d also means understanding how data travels, how information is transmitted under difficult conditions, how resilient communication is built.
\nAnd above all, they discover that in the era of instant communication, radio maintains something unrepeatable: the pleasure of technical and human encounter through a signal that crosses space, invisible but real.<\/p>\n","protected":false},"excerpt":{"rendered":"

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