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In any Big Bang cosmology, the frequency $\omega$ of light detected from adistant source is continuously and linearly changing (usually redshifting) withelapsed observer's time $\delta t$, because of the expanding Universe. Forsmall $\delta t$, however, the resulting $\delta\omega$ shift lies beneath theHeisenberg frequency uncertainty. And since there {\it is} a way of tellingwhether such short term shifts really exist, if the answer is affirmative wewill have a means of monitoring radiation to an accuracy level that surpassesfundamental limitations. More elaborately, had $\omega$ been `frozen' for aminimum threshold interval before any redshift could take place, i.e. the lightpropagated as a smooth but {\it periodic} sequence of wave packets or pulses,and $\omega$ decreased only from one pulse to the next, one would then bedenied the above forbiddingly precise information about frequency behavior. Yetbecause this threshold period is {\it observable}, being $\Delta t \approx1/\sqrt{\omega_0 H_0} \sim$ 5 -- 15 minute for the cosmic microwave background(CMB), we can indeed perform a check for consistency between the Hubble Law andthe Uncertainty Principle. If, as most would assume to be the case, the formereither takes effect without violating the latter or not take effect at all, thepresence of this characteristic time signature (periodicity) $\Delta t$ wouldrepresent direct verification of the redshift phenomenon.

Hubble redshift and the Heisenberg frequency uncertainty: on a coherence (or pulse) time signature in extragalactic light