Elon Musk and SpaceX have spent years turning rockets, satellites and orbital infrastructure into practical business tools. Reusable Falcon rockets changed the economics of launch. Starlink turned low Earth orbit into a commercial broadband network. Now, the next step in that strategy may be even more ambitious: putting artificial intelligence data centers into space. The…
A small USB stick that opens a large part of the radio spectrum A cheap RTL-SDR receiver is one of the simplest ways to discover that the air around us is not silent. To most people, radio still means FM broadcast, walkie-talkies, mobile phones or Wi-Fi. In reality, the radio spectrum is full of signals:…
Amateur radio FM satellites are one of the most accessible ways to experience real space communication with relatively simple equipment. They allow licensed radio amateurs to make two-way voice contacts through orbiting repeaters, often with a handheld transceiver, a small directional antenna, accurate pass prediction and disciplined operating technique. Unlike large geostationary communication satellites, most…
Doppler shift is one of the most important concepts in amateur radio satellite communication. Because low Earth orbit satellites move across the sky at extremely high speed, the received frequency continuously changes during a pass. The effect is especially noticeable on UHF satellite downlinks, where the signal may drift several kilohertz between acquisition of signal…
The Starlink system represents a structural change in satellite communications, particularly when viewed through a military lens. Traditional satellite systems, especially those operating in geostationary orbit, were designed around predictability, stability, and centralized control. They offered reliable long-range communication, but at the cost of high latency, limited bandwidth, and slow deployment cycles. Starlink in contrast…
Satellite communication has become one of the most important layers of modern infrastructure. Military units, aircraft, ships, emergency services, broadcasters, telecom networks, financial systems and internet providers all depend on signals coming from space. These signals carry voice traffic, encrypted military data, navigation information, television broadcasts, broadband internet and precise timing references used by critical…
