The Telex RTS PS-20 is a dedicated, high-capacity power supply unit engineered exclusively for RTS and compatible professional two-wire party-line intercom systems. It serves as the central power source for the entire communication network, providing clean, regulated DC voltage to energize system master stations, beltpacks, and other peripheral devices. Its primary role is to ensure system stability and audio clarity by delivering consistent power to a large number of user stations, which is critical for maintaining reliable communication in high-density installations like large broadcast facilities, major concert venues, and expansive theatrical productions. The unit is designed for 19-inch rack mounting, featuring a robust, fan-cooled construction built for continuous, 24/7 operation in demanding professional audio environments.

This model is characterized by its substantial power output, capable of supporting extensive intercom networks with dozens of stations over long cable runs without voltage drop or performance degradation. It incorporates advanced regulation and filtering circuitry to reject electrical noise and provide a steady DC output, which directly translates to lower system noise and hum in the intercom audio path. The PS-20 often includes multiple output taps or a variable voltage adjustment, allowing system technicians to fine-tune the supply voltage to match the specific requirements and cable length of the installed network, optimizing performance for both analog and digital party-line intercom components.

For safety and reliability, the unit includes comprehensive protection features such as overload cutoff, over-temperature protection, and fused AC input. Status indicators on the front panel provide immediate visual confirmation of power-on condition and operational normalcy. The rear panel typically features robust barrier strip connectors for the high-current DC output to the intercom line, as well as a standard IEC AC inlet. As a standalone component, the Telex RTS PS-20 is a fundamental building block for system designers and integrators, providing the essential, reliable power infrastructure needed to build large-scale, professional intercom systems that perform flawlessly under peak load conditions.