Viking Electronics CTG-2A Network Clock Controlled Tone and Message Generator
Overview
The Viking Electronics CTG-2A is a networked clock-controlled tone and message generator built for facilities that need precise, schedule-driven audio announcements across multiple zones. Whether you're running shift-change bells in a manufacturing plant, scheduled announcements in a school, or timed paging in a warehouse, the CTG-2A delivers up to 14 independent schedules and a 1,000-event calendar — enough capacity to cover complex multi-shift operations without manual intervention. It supports network time synchronization, so your audio events stay locked to real time rather than drifting on an internal oscillator. Explore the full Viking Electronics commercial audio and paging line for complementary products.
Key Features
- 14 Schedules and 1,000 Events: Program recurring tone and message events across up to 14 independent schedules with a total calendar depth of 1,000 events — enough to handle daily, weekly, and exception schedules for a full year without reprogramming. This is the core reason integrators choose the CTG-2A over simpler single-schedule units.
- 6 Minutes of WAV Audio Storage at CD Quality: Store up to 6 minutes of audio at 11K sampling rate, 3 minutes at 22K, or 90 seconds at 44.1K — all at 16-bit or 8-bit resolution. Choose the sampling rate that fits your message length and fidelity requirement; CD-quality 44.1K is appropriate for speech intelligibility in noisy environments.
- Network Time Synchronization: Time base locks to the network, eliminating clock drift that plagues internal-only units over weeks of operation. A 4-day internal clock backup keeps events firing accurately during network outages — useful in facilities where network maintenance windows are common.
- Four Programmable Trigger Inputs: Four screw-terminal trigger inputs let external devices (door contacts, PLC outputs, push buttons) fire tones or messages on demand, not just on schedule. Pair with a paging system zone controller for event-driven announcements.
- Preamp and Paging Amplifier Outputs: The preamp output delivers 6V RMS across 600 ohms for line-level integration with existing amplifier systems. The onboard 1-watt paging amplifier handles smaller zones directly, with a maximum speaker wire run of 300 ft (91m) — adequate for most single-zone installations without adding external amps.
- 85 dB Sound Pressure at 1 Meter: The built-in speaker produces 85 dB at 1 meter — audible in moderate ambient noise environments. For high-noise industrial floors, plan to drive external speakers through the preamp output instead.
- 29 Screw Terminals Plus RJ45: All connections land on a 29-position screw terminal block plus one RJ45 network jack. No proprietary connectors — straightforward to wire during rough-in and easy to service later. See our paging amplifiers and zone controllers for complementary wiring.
- Standard AC Power: Powers from a 120V AC / 13.8V AC adapter at 1.25A, with a maximum draw of 650mA. No special power infrastructure required; a standard outlet handles it. Review power supply options if you need backup power for the adapter.
Integration and Compatibility
The CTG-2A is designed to work with Viking's ZPI-4 zone paging interface, enabling WAV file playback to individual zones, zone combinations, or all zones simultaneously. The CTG-2A (often searched as CTG 2A) integrates into existing distributed paging infrastructure via its preamp output, making it a practical retrofit for facilities that already have amplifier hardware in place. The RJ45 network connection handles both time synchronization and programming access. Operating environment is 32°F to 90°F (0°C to 32°C) with 5–95% non-condensing humidity — suitable for conditioned mechanical rooms and office back-of-house, but not unheated warehouses or outdoor enclosures without additional climate control. Consult our intercom and paging systems category for zone interface accessories.
Frequently Asked Questions
Q: How many audio messages can the CTG-2A store?
A: The CTG-2A stores up to 14 different tones or messages within 6 minutes of total WAV audio storage. The usable message count depends on individual message length and sampling rate selected.
Q: What happens to scheduled events if the network goes down?
A: The CTG-2A includes an internal clock with 4-day backup. During a network outage, the unit continues firing scheduled events based on the internal time base, which holds accuracy to ±2 ppm.
Q: Can external devices trigger the CTG-2A outside of its programmed schedule?
A: Yes. The unit has four programmable trigger inputs on the screw terminal block. Devices such as door contacts, push buttons, or PLC dry-contact outputs can fire tones or messages on demand, independent of the schedule calendar.
Q: What amplifier output power does the CTG-2A provide?
A: The onboard paging amplifier output is 1 watt, with a maximum speaker wire run of 300 ft (91m). For larger zones or higher SPL requirements, use the 6V RMS preamp output to drive an external amplifier.
Q: What WAV file formats does the CTG-2A support?
A: The CTG-2A accepts WAV files at 16-bit or 8-bit resolution. Supported sampling rates are 44.1K (up to 90 seconds), 22K (up to 3 minutes), and 11K (up to 6 minutes total storage).
Q: What are the operating temperature limits for the CTG-2A?
A: The unit is rated for 32°F to 90°F (0°C to 32°C) with 5–95% non-condensing humidity. It requires a climate-controlled installation environment and is not rated for unheated or outdoor spaces without additional enclosure conditioning.
The CTG-2A is the unit I recommend when a facility has outgrown a simple single-schedule bell timer but doesn't need a full software-based scheduling platform. The 1,000-event calendar is the spec that makes this practical for real operations — a manufacturing site running three shifts with holiday exceptions and weekly variation can map an entire year's schedule without hitting a ceiling, and network time sync means you're not chasing 2-minute drift after every power cycle.
Technical Highlights:
- 1,000-Event Calendar Depth: At 14 schedules and 1,000 total events, you can encode daily, weekly, and exception schedules for a 365-day year with room to spare — far beyond the 50–100 event limits common in budget tone generators.
- ±2 ppm Internal Accuracy + 4-Day Backup: The internal oscillator holds ±2 ppm when the network is unavailable. Over a 4-day outage window, that's less than 1 second of drift — events stay on time through planned network maintenance without manual clock correction.
- 6V RMS Preamp Output into 600 Ohms: This is a proper line-level output, not a headphone jack. It integrates cleanly with installed 70V distributed amplifier systems, letting the CTG-2A retrofit into buildings that already have amp infrastructure — no rip-and-replace.
Deployment Considerations:
- The 300 ft (91m) maximum speaker wire run applies to the onboard 1-watt amp output only. If your zone runs longer or requires more SPL, route through the preamp output to an external 70V amp — do not extend the speaker wire beyond that limit expecting acceptable fidelity.
- Operating ceiling is 90°F (32°C). In mechanical rooms or IT closets that run warm in summer, verify ambient temperature before mounting — this unit will not tolerate a hot telecom closet without supplemental ventilation.
The CTG-2A is best suited for mid-size institutional deployments — schools, light manufacturing, distribution centers — where precise multi-schedule tone control is required but a PC-based scheduling platform is operationally impractical. It's a standalone, wired solution that facilities staff can operate without software expertise.
