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Radio "Iskra" released since May 1947, the Alexander Radio Factory. The four-spark Iskra spark receiver is assembled according to the infrared scheme with a high intermediate frequency. The use of a high intermediate frequency allowed to manage only a single-section variable capacitor in the local oscillator and to exclude the range switch. The range of operating frequencies (waves) is 150 ... 1200 kHz (250 ... 2000 m). The intermediate frequency is 5 MHz. Selectivity on the neighboring channel 7 ... 12 dB. The sensitivity of the receiver when using a good outdoor antenna and grounding is 5 ... 7 mV / m, which allows you to receive both local broadcasting stations and stations remote over a distance of 300 kilometers, and in the evening and at night time up to 1000 kilometers. In 1948, about 500 receivers were manufactured, on which its production was completed and the development of a battery receiver was also started with the name "Iskra" on finger lamps, but according to the usual superheterodyne scheme.