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A new fiber multiobject spectrograph of the prime focus of the BTA was manufactured, designed for the spectroscopy of low and moderate spectral resolution of up to 70 objects at once, visible in the telescope's field of view sized 12'. A metalized mask was inserted in the focal plane of the telescope, where with the aid of magnets the quartz fibers were fixed, transmitting the light in the focal plane of the collimator in the shape of a long slit. The new spectrograph brought an opportunity to explore the objects with absolute magnitudes m=22-23 in the R-band. In 1999 the spectrograph was used for the BTA observations within two programs.
After many years of work, the multi-frequency (matrix) radiometer with the fluctuation sensitivity above 10mK/s at all operating channels was completed and turned into operation at the RATAN-600 radio telescope.
We have extended (20-fold in the analysis strip) the capabilities of extragalactic research at the RATAN-600 in the 21cm line with the introduction of a 50MHz spectrum analyzer operating on the principles of acousto-optics.
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