A new-generation SCORPIO spectrograph was created for the primary focus of the BTA. It allows observations of extended and starlike objects in different modes: CCD photometry, panoramic spectroscopy with the Fabry-Perot interferometer, spectroscopy and spectropolarimetry with a "long-slit", slit-free spectroscopy, multi-object spectroscopy. In the spectral observations mode the instrument is 5-6 times superior in the efficiency to the existing spectrographs of this class at the BTA and is comparable to the best world analogues.
The reconstruction of the azimuth axis drive of the BTA is completed. Digital servo drives that were installed have improved the reliability of the complex, extended the range severalfold, and reduced the telescope's speed control step. The implementation of such drives provides a basis for the distributed control system of the BTA complex.
A new system of automated control of the RATAN-600 flat reflector was put into operation. It allows to increase the productivity of its use by an order of magnitude and develop new observational modes. The mode of multi-azimuth observations using an automated flat reflector, the South sector and a high-precision digital drive of the receiving cabin irradiator 3 was implemented.
The work on improving the accuracy of the reflecting surface of the RATAN-600 antenna was completed. As a result, the standard error of individual reflecting elements was improved to about 0.2 mm.
A software and hardware set for the BTA control system was implemented. It allows for the network monitoring of the telescope in different modes, including the display of video from the guide and service camcorders of the BTA. Three types of interface were carried into effect: the user, operator and Web-interfaces.
A digital archive was compiled, covering the observations at the RATAN-600 in the continuum for over 23 years of operation.