The Panoramic Ionospheric Recorder

This article givcs a description of a new type of recorder for ionospheric sounding. The recorder covers the frequency spectrum 1 to 20 Mc/s in 30 seconds and is for that reason of great value for investigations in the polar regions, where ionospheric conditions are very fluctuating. The use of a wide band transmitter and receiver has made the short sweep time possible. Only one variable capacitor rotating at low speed is necessary. Automatic tracking between receiver and transmitter is secured through the use of a heterodyne system. Samples of records obtained at Kiruna since the beginning of observations in July 1948 are shown.