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Radio station "20RTP" (Swallow) was produced since 1970. Portable radio station "20RTP" is a single-channel, simplex, transistor VHF radio station designed to organize a searchless, non-tuning telephone radio communication with radio stations of the same type at one of the frequencies in the range 33 ... 46 MHz. Frequency spacing between channels 25 kHz. Two-signal selectivity over the last 70 dB channel. Radio sensitivity 1 µV. The frequency deviation of the transmitter is 10 kHz. Power supply 7.5 V. The receiver is built on a superheterodyne circuit with double frequency conversion. The first IF is 7.612 MHz, the second is 0.5 MHz. For the 2nd IF, there is an EMFDP-500S-20.0 filter. Heterodyne stabilized by quartz resonators. The ULF load is a 0.1 GD-3M loudspeaker located in the case of an external headset and working as a microphone in the transmission mode. The transmitter is built according to the scheme with threefold frequency multiplication. The output stage is made on two parallel-connected transistors GT-311ZH. The mass of the radio station without a carrying bag is 0.95 kg. The radio station is used for organizing communications in various sectors of the national economy, for construction sites, railway and automobile transport, for agriculture over short distances up to 1 ... 2 km. The antenna power is 100 mW. A battery pack consists of six TsNK-0.45 batteries connected in series and is part of the radio. In the radio station "20RTP" used whip antenna length 1.5 m type Kulikova.