Ken Tapping National Research Council Marcus Leech Science Radio Laboratories, Inc. Abstract We describe alternatives to Dicke radiometers and phase-switched interferometers for small-scale radio astronomy. Instead of moderately-complex, hardware-based switching hardware that is often difficult to obtain or expensive, these designs use cheap, widely-available software-defined radio RTLSDR 1 “dongles” and free Gnu Radio 2 and simple_ra software. 1. Background Radio … Continue reading RTLSDR-based, Software Defined Radio Alternative to Switched Radiometers for Continuum Radio Astronomy