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Results of analysis of 60010 data photometric observations from the AAVSOinternational database are presented, which span 120 years of monitoring. Theperiodogram analysis shows the best fit period of 70.74d, a half of typicallypublished periods for smaller intervals. Contrary to expectation fordeep/shallow minima, the changes between them are not so regular. There may beseries of deep (or shallow) minima without alternations. There may be twoacting periods of 138.5 days and 70.74, so the beat modulation may be expected.The dependence of the phases of deep minima argue for two alternating periodswith a characteristic life-time of a mode of 30years. These phenomenologicalresults better explain the variability than the model of chaos.

R Scuti: Close Alternating Pulsation Periods or Chaos in the RV Tau -- Type Star?