Today I recovered a radiosonde from Vienna. It landed northwest of the village Ruppersthal near Großweikersdorf. The path to the landing site was partly unpaved and very muddy. Luckily, it didn’t rain last night so I could directly drive to the radiosonde

I once mentioned in a radiosonde hunting article that I change the temperature and humidity sensor of a RS41 sonde to a new one when reprogramming it because the calibration values for the original sensors get lost in the programming process. In this arti

The Gain Master antenna from Sirio is a very popular antenna for CB and the 10m amateur band. In my article I will explain how the “Gain Master” can be designed and built for different frequencies. Moreover, I will show how to further increase the gain.

Yesterday I recovered a radiosonde from Vienna. It landed north of the village Grunterdorf in a blooming potato field next to a busy road (by the locals called “Tschechenautobahn”). The sonde was still transmitting but I had no decoding equipment with me,

Sebastian, Matthias and I decided to stop at the shortwave station in Moosbrunn, Lower Austria while driving to Graz. In recent years, this station became well known for transmitting Radio DARC with a power of 100kW on Sundays. We only took some photos of

Schalten Sie im Katastrophenfall Ihr Funkgerät ab 12 Uhr, alle drei Stunden (immer um 1200, 1500, 1800, 2100, 2400, 0300, 0600, 0900), für mindestens drei Minuten, auf Kanal 3 ein und hören Sie auf Notrufe. Wenn Sie selbst Hilfe benötigen sollten Sie in d

changpuak.ch: Antenna and filter calculators classeradio.com: Class E AM Transmitter Descriptions, Circuits, Etc. VK1SV: Class-E for beginners dmitrynizh.com: Create Spice Models for tubes b-kainka.de: Electronic projects funknetzplanung.com: RF-Cal