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From the beginning of 1928, battery radiators of the type PKL-2 and PKL-3 were manufactured by the Leningrad Kozitsky Plant. In connection with the greatly increased interest in short-wave waves in the USSR, the TS.R.A receiver section of the Low Current Plant Trust developed and produced HF receivers of the type "PCL-2" and "PKL-3" (Receiver, Shortwave, Amateur, 2nd and 3rd options). Receivers are designed to receive telegraph and telephone radio stations. Receivers were released for sale in the form of assembled copies and complete sets for self-assembly. Radio receivers are assembled according to the 0-V-1 scheme. With the help of 6 interchangeable basket-type coils, radio receivers cover the wavelength range from 18 to 250 meters. Feedback is smoothly adjusted according to the Schnell method. The connection with the antenna is inductive, variable. The circuit capacitor is equipped with an electric vernier. Low frequency boost on the transformer. Radio "PKL-3" has two stages at a low frequency, instead of one in the receiver "PKL-2". The lack of receivers is an electric vernier, which does not allow graduation of the receiver. The price of the finished receiver "PKL-2" - 88 rubles. 50 kopecks Both receivers were produced until the end of 1929.