Small-sized radios '' Svirel-RP-406 '' and '' Svirel RP-306 ''.
Portable radio receivers and radios on p / p.DomesticSmall-sized radios "Svirel-RP-406", "Svirel RP-306" from 1988 and 1989 were produced by the Orsha plant Krasny Oktyabr. The receivers are the same, in terms of the scheme and design they are similar to the models of the Selga-309 type and are small-sized SV, DV superheterodyne assembled on one multifunctional microcircuit of the K174XA10 type or its foreign analogue, the KP-303 field-effect transistor and several radio components. To improve the sound quality and loudness, the set with radio receivers includes an acoustic unit, which consists of a larger diameter and with better electro-acoustic parameters of the loudspeaker and a separate 6-volt power supply (batteries and an external source), instead of a 4.5-volt power supply for the receivers in stand-alone mode ... The main characteristics of the receivers: Ranges: DV 148 ... 285 kHz and SV 525 ... 1607 kHz. Sensitivity in the ranges: DV 2.5, SV 1.3 mV / m. Adjacent channel selectivity 30 dB. The range of reproduced sound frequencies by the receiver in autonomous mode is 450 ... 3550 Hz. The frequency range reproduced by the acoustic unit is 250 ... 4000 Hz. Rated output power when operating in stand-alone mode is 100 mW. With acoustic unit 200 mW. The maximum power is 200 and 500 mW, respectively.
