Telex PS-20 Power Supply, 200Ohms/400Ohms Termination Impedance, 1.8 Amps Output Current, 28 to 32V DC Output Voltage, 90 to 264V AC Input Voltage

The Telex PS-20 is a complete independent TW (Two-Wire) power supply. It features 2- and 4-channel operation, RTS monitoring, 2-channel program input, audio linking and 3-mode operation Clear-Com mode. It also has double the power output of the PS-31 per channel, this increases the number of user stations and beltpacks which can be connected substantially. Features two (2) 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. It can also be switched into Clear-Com mode. It has a 3-pin XLR (male) connector on the front of the system, where a RTS user station can connect and monitor activity on either or both channels.

A single PS-20 power supply has 1.8 ampere per channel which means the user can power up more stations (see specifications for details). If additional user stations or beltpacks are needed, two (2) 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's 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.

There is a green status indicator for each channel on the front of the unit. Each of these indicators will remain lit during normal operation, but will turn red during a channel current overload condition. Output current is automatically reduced during an overload and normal operation is restored when the overload is removed. There is a program input connector on the rear panel. This can be used to connect a device that both channel 1 and channel 2 can listen to at the same time. A channel select switch on the front panel assigns the program to either or both channels. A level control adjusts the program level to the intercom channel. Intercom channels (user stations) are connected to the rear panel with 3-pin XLR connectors. The impedance select switch on the rear panel allows each channel to be set for 200Ohms or 400Ohms operation. Select 200Ohms for each channel operated independently. Select 400Ohms for each channel connected to another channel.