We have analyzed the radio light curves of PKS 1510-089 at 37 and 22 GHz from 1990 to 2005 taken from the database of the Metsähovi Radio Observatory, and find evidence of quasi-periodic outbursts. The light curves show great activity with very complicated non-sinusoidal variations. Using Jurkervich's method, the power spectrum method, and the discrete autocorrelation function to analyze these data, we have found two periods of p 1 = 0.92 ± 0.04 yr and p 2 = 1.82 ± 0.12 yr for the outbursts in PKS 1510-089. It is interesting to note that the results for two frequencies and three methods are almost the same and p 2 ≈ 2p 1 . In addition, these results are in good agreement with the periodic deep flux minima of 1.84 ± 0.1 yr (half period ∼ 0.92 ± 0.03 yr) observed by us and other authors in the optical band in 2002, 2004, and 2005.
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