= Bandwidth decorrelation of a point source
{title2=$V_{\rm avg}=V(\nu_0)\operatorname{sinc}(\pi\Delta\nu\tau)$}
A <point source> away from the tracked direction has residual <geometric delay> $\tau$. Averaging its frequency-dependent phase over a top-hat band gives the displayed sinc attenuation times its central-frequency complex phase. The first <bandwidth> null is complete cancellation, not a small-loss operating limit. Fine <frequency> channels preserve the information needed for later frequency-aware imaging.
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