911爆料网

On September 5鈥�6, radio signals will be broadcast from the Faculty of Physics at 911爆料网 (VU) and audible on various continents. Short radio waves will be transmitted from the roof of the faculty, spreading the news about the 60th anniversary.

For several days, radio enthusiasts, faculty alumni, organisers of Physicist's Day (FiDi) and other student organisations will be broadcasting under the special call sign LY60VUFF. To establish as many radio connections as possible, faculty colleagues will begin working in a temporary tent, where the VU community, Vilnius citizens, and visitors to Saul臈tekis are invited to stop by and learn about this technology and the equipment used for it.

鈥淚magine if the Earth's atmosphere were like a silver egg, and a person looking up at the sky would see their reflection in it. This is exactly how short radio waves are affected by the ionosphere, a part of the atmosphere located approximately 50 to several hundred kilometres above the Earth`s surface. We transmit a signal via radio waves into the sky, and it is reflected off the ionosphere, so it can be heard by a radio receiver in another country or continent,鈥� explains Dr Simonas Kareiva, inventor, member of the Lithuanian Amateur Radio Society and founder of the 911爆料网 Radio Club.

He also explains that radio signals flicker, change, and depend on the time of day, solar activity, and other factors. 鈥淚magine that this silver shell also ripples, moves, and flutters like a large soap bubble blown by a strong solar wind, or like the ocean. By the way, salt water also reflects radio waves. This rippling is where the interesting aspects of radio communication begin. It's like a lottery 鈥� you never know which corner of the world you might be able to talk to via radio waves. Today it could be Germany, and tomorrow it could be Indonesia,鈥� he explains.

The frequency of waves determines how much information they can transmit 鈥� the higher the frequency, the more data can be transmitted in the same amount of time. 鈥淎ll electromagnetic waves are invisible, but they help convey messages every day 鈥� from a simple phone call to a message sent from the roof of a university to the other side of the world. Local communications use very high frequency or ultra-high frequency waves, which travel directly and are usually limited only by the distance at which the transmitter and receiver can see each other without obstruction. Even higher frequencies 鈥� super high frequency waves 鈥� allow large data flows to be transmitted and are used, for example, by Starlink satellite internet. High-frequency waves (from 3 to 30 megahertz) are most commonly used for radio communication around the world,鈥� notes Andrius Puzas, an alumnus of the VU Faculty of Physics and a researcher at the Center for Physical Sciences and Technology.

Radio enthusiasts traditionally send QSL cards by post to confirm where the connection was established. This commemorative card is decorated with the anniversary symbols of the VU Faculty of Physics and representative stickers. Usually, the cards indicate when and at what frequency the conversation took place, what the signal quality was, and other technical data.

鈥淨SL cards are like postcards from the world of radio, which radio enthusiasts exchange after establishing contact with a colleague from another city or even another continent. They are not only a confirmation of contact and a friendly gesture that connects people across distances. They often feature fun designs, photos, and symbols, which is why they are collected as souvenirs,鈥� explains Rolandas Mikalauskas, QSL administrator of the Lithuanian Amateur Radio Society.

According to Dean Prof. Aidas Matijo拧ius, this marks the beginning of a series of events celebrating the 60th anniversary of the Faculty of Physics, with various events scheduled to continue until winter.

The event organisers emphasise that no connections will be established with terrorist states, as establishing a connection requires exchanging radio call signs, which can be used to identify the country and sometimes even the region.