The echelle-spectrometer LYNX is a part of the spectral complex (NES, MSS, LYNX) having a common control located at the Nasmyth-2 focus platform of the 6-m telescope.
The echelle spectrometer LYNX is designed and assembled by LSS SAO. Optical elements were produced mainly at the Vavilov Optical State Institute, St.Petersbourgh.
The optical layout (without its preslit devices) is presented here.
The preslit devices are presented here.
The focal length of the collimator is F=3074mm, the collimated beam d=100mm.
The echelle gratings of 37.5 gr/mm and 75 gr/mm, the blaze angle 64.3 grad and blazed area 300x200mm are used.
The gratings for cross dispersion have 150, 300 and 600 gr/mm, their blazed area is 145x145mm.
The Shmidt camera's focal length is F=387 mm, the camera's mirror diameter is D=240mm, the diameter of the correction plate is D=210 mm.

The echelle spectrometer LYNX is equipped with the CCD (1040x1160 pixels, the pixel size 16x16mkm) developed by ADL SAO.

This spectrometer is intended for a spectroscopy of objects with a high spectral resolution (R about 35000) in the wavelength range 5000-9000 AA. The number of spectral orders registered simultaneously by the detector is determined by the cross-dispersion grating. The source of the comparison spectrum is a Th-Ar lamp. The accuracy of radial velocity measurements using the spectrograph is 0.1-0.2 km/s, while the equivalent width measuring accuracy amounts to 5-6 %, for the line equivalent widths in the interval 4-10 mA. The CCD and image recording are controlled with a PC inside the environment of OS Linux. Echelle-spectra are available for users in FITS format.

More details you could find in the description of LYNX (PostScript-file, in Russian). Some details of the construction are presented in the SAO Preprint, 1999, N139.