Radio Design Labs TX-PCR1

Paging Controlled Relay - 7 Year Warranty• Switching Functions Controlled by Speaker-Level Source• Input Accepts Amplified Constant Voltage Signals• Switch-Selectable Input: 25 V 70 V 100 V• 25 Volt Input Also Accepts 8 Ω Inputs up to 75 Watts• Transformer-Isolated Input• Front-Panel Trimmer Provides Sensitivity Adjustment• Signal Threshold LED Facilitates Sensitivity Adjustment• Front-Panel Trimmer Provides Release Delay Adjustment• LED Indicates when Module is Triggered• Release Delay Adjustable from 3 to 25 Seconds• Open-Collector Output Active when Module is Triggered• Switches on Paging or Any Other Amplified Audio Signal• 8 Amp DPDT Relay Contacts for Switching Speaker Loads• Ideal for Muting or Switching Primary Speakers During PagingThe TX-PCR1 is the ideal choice in many applications where switching needs to be controlled from a constant-voltage amplified audio source. The module will trigger on any program material with paging sources being the most common. The TX-PCR1 includes both an open-collector SLAVE output to control other modules or equipment and a DPDT high power switching relay suited to switching speaker loads.The amplified audio source is connected using a detachable terminal block. A front-panel switch is provided to select the source type: 25 V 70 V or 100 V. The 25 V setting may be used for an 8 ohm 75 Watt maximum amplified source. Input sensitivity is adjusted on a single-turn trimmer. In the clockwise position the SENSITIVITY trigger threshold is 30 dB below the switch-selected constant voltage. A red LED illuminates whenever the audio level exceeds the trigger threshold facilitating the sensitivity adjustment.The module is triggered when the audio exceeds the threshold and it remains triggered for a defined time duration after the audio falls below the threshold. This DELAY is adjustable from 3 to 25 seconds using a front-panel trimmer. Adjustment is simplified b