Viking 12in. in. Analog Clock - CL-A12

Viking Electronics CL-A12 12-Inch Wireless Analog Clock

Overview

The Viking Electronics CL-A12 is a 12.9-inch wireless analog clock designed for synchronized timekeeping across commercial facilities — schools, healthcare corridors, manufacturing floors, and institutional campuses where clock accuracy actually matters for operations. The CL-A12 receives a 928 MHz clock sync signal and, critically, retransmits it via a built-in repeater — meaning a single master signal can propagate through a chain of clocks without a dedicated repeater appliance at every hop.

This is a wall-mount unit built for indoor commercial environments. The face measures 12.9 inches (327mm) outer diameter with a 2.6-inch (66mm) depth — slim enough to sit flush against a corridor wall without protruding into traffic paths. If you need a larger display, Viking's Viking Electronics catalog includes the CL-A16 variant at 16 inches in the same CL Series family.

Key Features

• 928 MHz Sync Frequency: Operating at 928 MHz keeps the CL-A12 in the 900 MHz ISM band — a range that penetrates walls and floors better than 2.4 GHz alternatives, reducing dead zones in concrete-heavy buildings like hospitals or older school construction.
• 3,300 ft Transmission Range: The rated RF range covers most single-floor commercial layouts without an intermediate repeater. For multi-floor or large-footprint facilities, the built-in repeater function lets each clock re-broadcast the sync signal, extending coverage in a daisy-chain without extra hardware cost.
• Built-In Repeater: The CL-A12 and its CL-A16 sibling are unique in the CL Series for having an integrated repeater that re-transmits the clock sync signal up to 200 ft in open space. Deploy these at range boundaries to push the synchronized signal deeper into a building — no separate repeater SKU required.
• 1-Watt RF Output (30 dBm): Full 1-watt transmit power maximizes propagation through typical commercial construction. Lower-power wireless clocks often require more access points; this output level reduces that infrastructure overhead on larger deployments.
• Wide Input Voltage (90–230V AC, 50–60 Hz): Universal input voltage means the CL-A12 (often searched as CL A12) works on both North American 120V and international 230V circuits without a step-down transformer. Useful for facilities with mixed electrical infrastructure or multinational campuses.
• 12.9-Inch Face Diameter: At 327mm outer diameter, the clock face is readable from corridor distances of 30–40 feet without requiring oversized mounting hardware. The 2.6-inch depth keeps the wall profile minimal.
• Operating Temperature 0°C to 50°C (32°F to 122°F): Rated for the full range of typical indoor commercial environments — from unconditioned storage rooms in summer to cold lobbies in winter. Not rated for outdoor or freezer/cold-chain use.
• FCC Part 15 Compliant: The CL-A12 carries FCC Part 15 certification, confirming it meets US RF emission standards for unlicensed operation. No spectrum license required for deployment; straightforward for facilities managers and IT teams coordinating wireless infrastructure.

Integration and Compatibility

The CL-A12 is part of Viking's CL Series wireless clock system, which includes the CL-A16 analog clock and CL-D4 digital clock variants. All CL Series clocks share the 928 MHz sync infrastructure — a mixed deployment of analog and digital faces is supported within the same RF network. The CL-D4 supports both 120VAC and 16–28VDC input, which may be relevant if you're integrating into a DC-powered infrastructure or UPS-backed clock circuit.

For facilities coordinating clock sync with paging and intercom systems, Viking's broader product line covers PA controllers and IP paging endpoints that can share the same facility management infrastructure. Clock synchronization and bell scheduling are often co-managed in K-12 and healthcare environments — verify your master clock controller's output frequency and RF compatibility before deploying the CL Series at scale.

The wall-mount form factor requires standard drywall or masonry anchoring. Movement dimensions are 7.32″ x 3.46″ x 1.81″ (186mm x 88mm x 46mm) — the mechanism is compact relative to the clock face, which simplifies replacement or service without removing the mounting hardware.

Frequently Asked Questions

Q: What frequency does the CL-A12 operate on?

A: The CL-A12 operates at 928 MHz in the 900 MHz ISM band. This frequency provides better wall and floor penetration compared to 2.4 GHz systems, making it well-suited for concrete or masonry construction common in schools and healthcare facilities.

Q: Does the CL-A12 have a built-in repeater?

A: Yes. The CL-A12 includes a built-in repeater that can receive and retransmit the clock sync signal up to 200 ft in open space. This lets you extend coverage by chaining clocks without purchasing separate repeater hardware.

Q: What is the maximum wireless range of the CL-A12?

A: The rated transmission range is 3,300 feet under open-space conditions. Actual range through walls and floors will be shorter depending on construction materials. The built-in repeater function can extend effective system range by re-broadcasting the signal from each clock.

Q: What is the clock face size of the CL-A12?

A: The CL-A12 has a 12.9-inch (327mm) outer diameter face with a 2.6-inch (66mm) depth. If a larger display is needed, the CL-A16 offers a 16-inch face in the same CL Series family with the same sync infrastructure.

Q: What voltage does the CL-A12 require?

A: The CL-A12 accepts 90–230V AC at 50–60 Hz, covering both North American and international electrical standards without a step-down transformer.

Q: Is the CL-A12 rated for outdoor installation?

A: No. The CL-A12 is rated for indoor use with an operating temperature range of 0°C to 50°C (32°F to 122°F). It is not rated for outdoor environments, direct moisture exposure, or freezer/cold-chain applications.

Karl Wilson

The spec I keep coming back to on the CL-A12 is the built-in repeater — 200 ft of open-space re-broadcast range per clock node is genuinely useful when you're wiring up a multi-wing school or a hospital floor where you can't run a dedicated master clock cable to every junction. That one feature changes the installation math considerably compared to systems that need a standalone repeater appliance at every signal boundary.

Technical Highlights:

• 928 MHz / 1W (30 dBm) RF: Full 1-watt output at 928 MHz punches through standard commercial construction better than 2.4 GHz solutions — expect noticeably fewer dead zones in masonry corridors or multi-story concrete structures.
• 3,300 ft Rated Range: Covers the footprint of most single-building K-12 or clinic deployments from a single master transmitter, with the built-in repeater available to push signal into wings beyond that radius.
• Universal 90–230V AC Input: No transformer, no power conversion — the CL-A12 drops into any commercial outlet. Simplifies installation logistics on campuses that mix older 120V panels with newer 208V or international circuits.

Deployment Considerations:

• The repeater retransmits up to 200 ft in open space — plan for reduced range through fire-rated or masonry walls, and budget an extra clock node at those boundaries rather than assuming the rated distance holds through obstructions.
• Operating temperature tops out at 50°C (122°F) — fine for conditioned indoor spaces, but do not install in unconditioned mechanical rooms, attics, or any location subject to summer heat buildup above that ceiling.

The CL-A12 is the right call for K-12 facilities coordinators and healthcare plant operations teams running a synchronized clock network in a multi-room building where dedicated cabling isn't feasible — the 928 MHz repeater chain architecture is the practical answer to that specific problem.