Description: The paper proposes to improve the DKM-MW waves radio station by replacing the analogue frequency synthesizer with a digital one and by replacing manual adjustment of antenna-matching device with automated setting. The technical construction solution of a digital frequency synthesizer allowed to reduce the period of time the system requires for synchronization and to simplify technical implementation of the reference sensor block and the second heterodyne. Improvement of the automatic tuning system of the antenna coupler made it possible to set up ten fixed frequencies and to transmit high-gain signals within a small interval of time. The P-161A2-M radio station was chosen as a prototype. When located at a distance from the battle line, this radio station effectively provides operational information exchange between the Joint Operation headquarters and operational command control posts and Air Forces headquarters. The P-161A2-M radio station is used in radio networks outside the Joint Forces Operations because of insufficient quantity and great price of more modern Harris type radio stations. One of the prob-lems of creation of a frequency synthesizer based on the pulse-phase detector system is the deterioration of the phase noise of the synthesized oscillation when the step of the net of the output frequency decreases. When a digital fractional divisor with ex-changeable fission coefficient is used in a synthesizer with a pulse-phase detector, it allows to obtain the initial oscillation with a sufficiently high spectral purity. In addition, it allows to accelerate the time of synchronization, which reduces the time of pas-sage from one frequency to another. The modern digital elemental base made it possible to reduce the mass-size dimensions due to the low level of necessity to use 12 functional elements in the reference frequency sensor block and the second heterodyne.To provide automated adjustment of an antenna coupler of the P-161A2-M radio station, that was selected as a prototype, it is pos-sible to use elements of the automated adjustment system of an antenna coupler of the P-857 radio station, namely the module sensor and phase sensor. This can be done with no radical modification of the elements of the control system of the selected radio station, increasing the efficiency of control and the speed of adjustment within a short period of time.
Keywords: frequency synthesizer (FS), the reference sensor block (RSB), pulse-phase detector (PPD), module sensor (MS), phase sensor (PS), antenna-matching device (AMD)