Keywords: pdbi-amp-cal

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## Partial Beam Coverage

This scheme has been implemented on Plateau de Bure, where the dynamic range of the detectors is relatively small (only 2 between optimum sensitivity and saturation). The only change from the standard equations presented before is the introduction of the ``beam filling factor'' or ``calibration efficiency'' in the output on the chopper (from Eq. (1-2))

| (17)

Algebra similar to that already exposed yields

| (18)

just correcting by an additional scaling factor.

In TREC mode, the sky emission is derived by

| (19)

and in AUTO mode, the receiver temperature may be derived by

| (20)