Radio, DX-ing, Linux, Hacking & more…
W ubiegłym sezonie stałem się obserwatorem pasma 5 GHz. Mikrofale, dotychczas niemal zupełnie obce mi pasmo fal radiowych, były wspólnym mianownikiem wielu przygód i odkryć. Co najciekawsze – nie przy radioodbiorniku, a daleko poza domem.
Czytaj dalej: https://xploradio.blogspot.com/2022/02/mapowanie-wifi-na-5ghz.html
During last Black Friday I bought Raspberry PI 4 on Aliexpress for just $36. After initial tests I’ve found out that a good cooling case is definitely a must have. The SoC quickly reaches 80°C under a full load and then throttles from 1.5 to 1.0 GHz per ARM core to maintain the temperature limit. So, I ordered a very nice Chinese aluminium case for just $7.5. I love PoE devices – my new toy must also support Power over Ethernet – and it does!
I took a cheap LM2596 DC converter and installed it together with the board in the aluminium case.
W ostatnim czasie pojawiło się nowe pozwolenie radiowe radia Chilli Zet na emisję w Krakowie na częstotliwości 93,7MHz z wieżowca przy Rondzie Grzegórzeckim. Emisja ma być prowadzona z wysokości 92m według pozwolenia (choć wizualnie wysokość zawieszenia anten wygląda na wyższą o 10 metrów), w pionowej polaryzacji i z mocą 870W ERP.
A remarkable tropospheric ducting occurred on August 11 and 12, 2020 between Poland, Sweden and Denmark. The propagation forecasts, which use color hue to scale their intensity, featured red shades over the Baltic Sea. Such a propagation strength is very rare, if ever seen on a forecast for this area. I was looking forward for something extraordinary, especially on the microwave bands. My stationary Wi-Fi DXing setup has been damaged three months ago. I could not miss such an opening, so a DX-pedition was the only option. In the evening of August 11 I made an opportunistic decision to visit the Dylewska Góra in north-eastern Poland. A few hours later, I was standing there with an antenna inside a lookout tower.
With its tip at 312 m ASL, Dylewska Góra (Dylewska Mountain) near Ostróda is the highest hill of the whole north-eastern Poland. There is a wooden lookout tower atop which provides fantastic unobstructed views between 175° to 340° azimuth with optical visibility up to around 50 km. The driving distance from my location is 135 km and I arrived there in two hours, in the middle of the night (2 AM). I knew that place as I have visited it already once with my friend. Back then in the 2018 we encountered a typical morning inversion without any notable long-range ducting (see the report: Early morning on Dylewska Góra).
Pierwsza część artykułu dostępna jest tutaj: Tropo: Więcej radia w Nowy Rok!
Do północy brakowało już kilku minut daleki dukt osłabiał się i zbliżał się wgłąb naszego kraju. SR P1 z szwedzkiego Hörby (486 km) dobijało do 41 dBf. Niestety przez mocne stacje obok odbiór został mocno pogorszony.
Ten wpis jest dostępny także w języku polskim: Nowy Rok 2020: Rekordowa inwersja nad Polską
This year’s winter in Poland has been very mild so far and it does not resemble this season in our country at all. In fact, it is more like late autumn with possible light frosts. The forecasts for January are still in line with current weather, so this month will be definitely warmer than average. Starting from the end of December 2019, subsequent high pressure systems began to move to Poland. Such weather favors good propagation conditions, which can significantly increase the range of radio emissions. An inversion in the troposphere can enhance the reception within a wide frequency range, starting from the lower VHF (typically 50-70 MHz), through broadcast radio, television, microwaves and finally even… optical waves.
