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For continuum measurements observers can use either the Digital Continuum Receiver (DCR) or the Analog-to-Digital (A/D) Converters. The pointing is typically done with the A/D's while the DCR is used for more sensitive continuum measurements.

For spectral line observations there are two choices: the NRAO Model IV correlator or the spectral processor. A brief overview of each system is given in the following links:

NRAO Model IV Autocorrelator
Spectral Processor

A more complete description of the spectral processor can be found here:

Spectral Processor

An estimate of radiometer sensitivity is given in the following link: