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We report the beginning of the astronomical masers investigations in the 3-mmbandwidth at the radio telescope RT-22 (CrAO, Ukraine). For this purpose thespecial complex for maser lines investigation in 85...115 GHz frequency band isdeveloped. It is made on the base of the low noise cryogenic Shottky-diodereceiver and the high resolution Fourier-spectrometer. The cryogenic receiverhas the DSB noise temperature less than 100K. The spectral channel separationof the Fourier-spectrometer is about 4kHz and the spectrometer bandwidth is 8MHz. Results of maser observations of 8$^{0}-7^{1} $A$^{+}$ transition ofmethanol (95.169 GHz) towards DR-21(OH), DR-21W and NGC7538 are in goodagreement with early obtained results by other authors. On the basis of theanalysis of the location of masers in the NGC7538 direction we can assume thatthe origin of all known class I methanol masers in this region is connectedwith existing molecular outflows from young stars.

Methanol Masers Observations in the 3-mm Bandwidth at the Radio Telescope RT-22 CrAO