Abstract
ABSTRACTSome components of the photometric equipment, designed and made to use in high speed multichannel stellarphotometry for the Whole Earth Telescope (WET) and other astronomical programs, are described. Despite this specialpurpose, the described equipment could also be used for any kind of stellar photometry, especially for observations ofvariable stars. Small size and weight of the equipment make it suitable for observations in expeditionary conditions. An original solution of the step-motor feeding for the filter wheel rotation is presented, and the filter selling system FD 306based on it is described and discussed.Keywords: instrumentation: photometers 1. INTRODUCTION1.1. Whole Earth Telescope project The Whole Earth Telescope. or WET1 .isan existing telescope, which comes into life one or two times every year. Itconsists2 of astronomers who travel to telescopes at selected longitudes around the Earth and observe the same stars withfunctionally equivalent instruments. making those separate instruments like one much more productive instrument. When
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