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We have used sensitive LOw Frequency ARray (LOFAR) observations of PSRB0809+74 at 15--62 MHz to study the anomalously intensive pulses, firstreported by Ulyanov et al. (2006) at 18--30MHz. Similarly to Ulyanov et al., wefound that the spectra of strong pulses consist of distinct bright patches.Moreover, these spectral patches were spotted to drift upwards in frequencyover the course of several pulse sequences. We established that this drift isnot pulsar-intrinsic, but is caused by the broadband ~20 second-longenhancements of recorded signal, which influenced the dispersed tracks ofseveral pulses at once. We speculate on the cause of such enhancements (i.e.propagation or telescope-related) and the ramifications they bring to thesingle-pulse studies at the very low radio frequencies. Depending on theorigin, the phenomenon may also affect the analysis of highly dispersed singlepulses at higher radio frequencies, e.g. Fast Radio Bursts.

On the patchiness of the individual pulse spectra at the very low radio frequencies