  We survey the spectro-temporal properties of fast radio bursts from FRB
20121102A observed by earlier studies across a wide range of frequencies. We
investigate 167 bursts from FRB 20121102A spanning frequencies 1--7.5GHz,
durations of less than 1 ms to approximately 10 ms, with low and high energies,
and with different wait-times. We find from this sample of bursts a strong
agreement with the inverse relationship between sub-burst slope and duration
and with other predictions made by the triggered relativistic dynamical model
(TRDM). Earlier results found agreement with those predictions across three
different repeating FRB sources. For this sample of bursts, we find that the
sub-burst slope as well as the 'sad trombone' drift rate are consistent with
being in a quadratic relationship with frequency and that both these quantities
are inversely proportional to the duration. We also find that the duration
decreases with increasing frequency as well as a statistically significant
correlation between the sub-burst duration and bandwidth (proportional to
$t^{-1/2}$) that is unexpected. No distinct group of bursts in this sample
deviated from these relationships, however significant scatter can be seen in
measurements. This study demonstrates the consistent existence of relationships
between the spectro-temporal properties of bursts from a repeating FRB source.
A simple explanation for the inverse relation between the sub-burst slope and
duration is an inherently narrowband emission process. We make all measurements
available as well as a graphical user interface called Frbgui developed and
used to perform measurements of burst waterfalls.
