In the following I list a series of tutorial documents on a variety of radio astronomy subjects. Many of these documents derive from the (now defunct) NRAO 12m Telescope Users Manual.
Millimeter and Submillimeter Astronomy Overviews
Millimeter Astronomy: Article which appeared in the Encyclopedia of Physical Science and Technology which presents an overview of millimeter astronomy.
System Temperature Calculation for ALMA: A summary description of system temperature calculation from skydip measurements. Used as an "instruction manual" for Computing IPT for their simple implementation of a skydip analysis routine.
Walsh Function Modulation: A description of how Walsh function modulation is used to remove standing wave structure in switched radiometric measurements.
From Sky Brightness to Visibility: How to Transform Radio Interferometer Measurements to Images. Great description by Scott Schnee which summarizes how to convert the "uv" data measured by an interferometer to a radio image.