CTG-1A - Clock Controlled Tone Generator | Viking Electronics

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Add Time Controlled Alert Tones and Emergency Tones to Your Overhead Paging System

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Product Details

Viking’s model CTG-1A is a clock controlled tone generator designed to provide accurately timed bong alert tones or buzzer alert tone sounds over an existing paging system.

The CTG-1A can be programmed to output single, double or triple alert tones with up to 128 events in a 24 hour period in two separate schedules on a paging system. These bong/buzzer sounds are ideal for indicating the start and end of shifts, break times, lunch periods, etc. for factories, schools, or any business requiring an audible indication of specified times. Each day of the week can be programmed to either on or off, allowing you to turn off the alert tones during specific days of the week (weekends, etc.) In place of sending tones, the CTG-1A can be set up to operate a timed relay.

The CTG-1A has three contact closure inputs for triggering an emergency siren, evacuation signal or a doorbell sound.


  • Signal the beginning and end of class periods, breaks, and lunch periods for schools
  • Signal the beginning and end of shifts, breaks, and lunch periods for factories and other businesses
  • Provides a doorbell and/or alarm sounds over an existing paging system, for such applications as door entry, fire, severe weather, etc.
  • Use with Viking’s DVA-2WA to provide timed messages (DOD 110)



  • Accurate 24 hour digital time clock displays hours and minutes synced to AC power
  • User programmable 24 hour, 128 event timer in two separate schedules
  • Programmable day of week on/off feature
  • Programmable single, double or triple alert tone output (select bong or buzzer)
  • Three contact closure controlled sounds:
    • Emergency siren (yelp) sound
    • Temporal (slow whoop) evacuation signal*
    • Doorbell (chime) sound
  • 600 Ohm line level audio output with volume control
  • Non-volatile memory with four day clock backup
  • Two sets of DPDT relay contacts for muting paging or background music during alert tones or timed relay events
  • Switchable 50/60 Hz operation
  • Switch for Daylight Saving Time
  • Time Relay Mode

*NFPA/ANSI compliant when used with supporting equipment


  • Power: 120V AC/13.8V AC 1.25A UL listed adapter provided
  • Dimensions: 5.25” x 3.6” x 1.75” (133mm x 91mm x 44mm)
  • Weight: 2 lbs (0.9 Kg)
  • Environmental: 32°F to 90°F (0°C to 32°C) with 5% to 95% non-condensing humidity
  • Connections: 12 position cage clamp terminal strip
  • Internal Clock Backup Time: 4 days
  • Time Base: 50/60Hz AC power line
  • Time Base Backup Accuracy: +/- 5 ppm
  • Audio Output: 600 Ohm with volume control potentiometer, maximum level = 17 dBm/5.4Vrms
    across 600 Ohm load
  • Relay Output: DPDT rated 30V DC @ 1A, 110V DC @ 0.3A ,125V AC @ 0.5A (resistive loads)


To download a tone for use on your product, right click on the Download icon and select "Save Link As" (instructions may vary slightly per web browser)

Tone Description Preview Download
CTG-1A Door Chime Door Ding Dong N/A
CTG-1A Double Bong Double Bong N/A
CTG-1A Double Buzz Double Buzz N/A
CTG-1A Evacuation Whoop Continuous Evacuation Whoop Loop N/A
CTG-1A Evacuation Whoop Momentary Single Evacuation Whoop N/A
CTG-1A Single Bong Single Bong N/A
CTG-1A Single Buzz Single Buzz N/A
CTG-1A Siren Continuous Siren Loop N/A
CTG-1A Siren Momentary Single Siren N/A
CTG-1A Triple Bong Triple Bong N/A
CTG-1A Triple Buzz Triple Buzz N/A