arXiv:2610.37067v1 Announce Type: new Abstract: A frequency-agile radar with a large digital array moves the spatial frequency of its look direction across the beams of a spatial FFT every time it changes carrier, so a beamspace adaptive processor must decide where to put its window at each hop. Because the beamspace transform is orthonormal, the output of the processor depends only on the span of the window, and a hop changes nothing but where the window sits. Centring the window exactly on the fractional bin of the look direction keeps the look vector fully inside it at every carrier, for the price of one phase ramp before the FFT. On a 32 by 32 array over 4 to 8 GHz the look bin drifts by 1.6 to 6.9 bins for look directions from u=0.2 to 60 degrees. Rounding to the nearest bin costs up to 1.34, 0.74 and 0.50 dB of look-direction capture for 3 by 3, 5 by 5 and 7 by 7 windows. In a three-jammer scenario with 41 carriers, a window frozen at the lowest carrier loses 39 to 60 dB at the worst carrier for a look direction of u=0.55, the exact window beats nearest-bin placement by 0.31 to 0.65 dB there, and the advantage reverses for a nine-beam window near broadside, where nearest-bin was 0.61 dB better.