Handbook for the SX remote control Spectrograph Issue 1, 17/8/20
Handbook for the SX Spectrograph PRO with remote control
Introduction:
Spectroscopy of astronomical objects is a relatively unexplored field for many amateur observers, as truly compact, inex-
pensive and effective spectrographs have been unavailable until recently. This situation is now changing and spectrometry is
becoming popular as a way to extend the scientific value of amateur observations and to add a new dimension to the hobby.
The first SX Spectrograph was introduced in 2016, but was intended for local operation, where the user could change slits,
focus etc., by hand. The market has since evolved to include many remote observatories, well beyond the direct reach of the
observer, so we have now automated most of the spectrograph functions. The ‘remote’ spectrograph allows you to change
slits, adjust the imaging camera focus and wavelength setting, and switch on a calibration lamp, or flat field lamp, remotely.
General description:
The SX Spectrograph PRO is only 125 x 140 x 75 mm and weighs just over 1 Kg. It is solidly constructed in a machined
aluminium enclosure and so will not flex during use. The optical design is based on a highly corrected, 550 groove concave
reflecting grating, that provides a spectral length of 31 mm from 340 to 900 nM. The entire spectrum is accessible by adjust-
ing a sliding camera carrier, using a motor driven threaded drive screw, but most of the visible spectrum can be seen without
adjustment, when using an SX694 imaging camera. A 6 position slit wheel, with various slit widths and lengths, is provided
and will allow the sensitivity and resolution to be optimised for the user’s project. The best resolution R factor when using
