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Army portable short-wave simplex radio stations "R-104" (RDS) and "R-104M" (Cedar). Release respectively since 1949 and 1955. The radio station "R-104" is designed for simplex shortwave communication in the frequency range from 1.5 to 3.75 MHz in two sub-bands. It is assembled according to the transceiver scheme. The receiving path includes a single UHF cascade, a mixer for telephone mode, a mixer for telegraph mode with a quartz filter, a two-stage IF amplifier with filters, and a low-frequency amplifier used for transmission as a modulating signal amplifier. The local oscillator is a tunable L.C- generator operating in the frequency range 2.19-3.57 MHz. When operating on the first subband, the received signal is subtracted from the heterodyne signal to get an IF which is equal to 690 KHz) and when operating on the second subband, the local oscillator signal is subtracted from the received signal. When working on transmission with a tunable local oscillator signal, the signal of a quartz oscillator with a frequency of 690 kHz is mixed. Amplitude modulation is carried out in the output stage of the transmitter, which uses a GU50 lamp (in a portable version of the radio station) or a 4П1Л lamp (in a wearable version). For coordination with different types of antennas, an antenna matching device is included in the radio station kit. The power supply of the radio station is designed as a separate unit. Tuning to frequency is carried out on a visual circular mechanical scale. The power supply voltage of the radio station in a portable version is a 4.8 volt battery. The mass of the radio station is 21.5 kg, the mass of the whole set is 39.5 kg. The output power at the equivalent of the antenna in the portable version is 20/10 W AM / CW, in the wearable version 3.5 / 1 W, respectively. The radio station "R-104M" is distinguished by an extended range of 1.5 ... 4.75 MHz and small changes in electr. scheme.