FIELD: pipeline transport, namely, operation of main and industrial pipelines. SUBSTANCE: device has receiver and transmitter of electromagnetic signals. Transmitter output is connected to radiating antenna which signals are caught by antenna of portable receiver positioned above pipeline on ground surface. Output of portable receiver antenna is connected in series with amplifier, decoder and check and indication device. Series-connected crystal oscillator, mixer and intermediate-frequency amplifier are inserted between amplifier and decoder. Crystal-oscillator output is connected to one of mixer inputs, other input of mixer is connected to amplifier, and mixer output is connected to decoder input. Device features enhanced reliability of transmitter signal recognition and noise immunity of receiver. EFFECT: enhanced high-speed response. 1 dwg
