Majority of PMSE spectral widths at UHF and VHF are compatible with a single scattering mechanism

► 380 min of simultaneous spectral PMSE measurements at 224 and 930 MHz are analyzed. ► Our study resolves previous contradictory results based on much shorter data sets. ► The vast majority of PMSE spectral widths at the two frequencies agree well. ► Small systematic differences are attributed to beam and wave broadening effects. ► Our results strongly support that the same mechanism is active at both frequencies.