The PS-20 is a complete and independent power supply. The PS-20 has added features like two- and four-channel operation, RTS monitoring, 2-channel program input, audio linking, and three-mode operation: RTS 2-channel, RTS 4-channel and Clear-Com mode. It also doubles the power, which substantially increases the number of user stations and beltpacks that can be connected.
The PS-20 features two channels of communication where both channels are "wet," meaning there is power on each channel (RTS 2-channel mode). In RTS 4-channel mode, the audio signals and DC exist on the same wire, unlike in Clear-Com mode, where the audio and power are on separate lines. Where the PS-15 has power on CH 1 only, power is on both CH 1 and CH 2 on the PS-20. The PS-20 has a 3-pin XLR (male) connector on the front of the system, where a user station like a beltpack can connect to the power supply and monitor activity on CH1 or CH 2 or both. A single PS-20 Power Supply now has 1.8 amperes per channel, which means that the user can power up for more stations (depending on the model and combination – see specifications). If still more user stations or beltpacks are needed, two PS-20 Power Supplies can be joined together to double the power capability. A pair of standard stereo plug connectors are available on the back of the power supply to connect two PS-20 power supplies through audio linking as well. The PGM IN (3-pin XLR female Program Input) connector can be used to send Audio to both CH 1 and/or CH 2 (for example, a radio station that users can listen to while they work).
For more information, visit the RTS Two-Wire Intercom website: www.rtstw.com