CL-RFT | RF Tansmitter Wireless Clock System | Viking Electronics

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RF Transmitter / Repeater for Viking Clocks

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Product Details

The CL-RFT RF Transmitter / Repeater is part of Viking’s Wireless Clock System that provides reliable, accurately synchronized clocks for your entire facility. Eliminating dedicated clock wiring can save you thousands of dollars on installation and also allows for easy retrofitting of an existing installation. While most wireless systems are limited to the range of the transmitter, Viking’s system is not. Each clock acts as a repeater (transceiver), meaning the secondary clocks both receive and retransmit the signal, maximizing signal transmission distances. The system is comprised of a CTG-2A master clock, a CL-RFT clock RF transmitter and analog or digital wireless slave clocks. Working on Viking’s 915-928MHz frequency hopping technology eliminates interference with other wireless products and requires no FCC license, eliminating extraneous fees. The received signal remains strong even under the effects of noise, obstructions or long distances which tend to decrease the signal to noise ratio. Installation is a cinch for our wireless clocks, just insert the batteries or connect power and hang them. That’s it.

Viking’s CL Series wireless clocks include automatic calibration, as well as diagnostics that allow the user to view the signal strength, how long since the last time the clock received a signal, a comprehensive analysis of the clock itself and remaining battery life. The 12 and 16 inch wireless analog clocks receive and retransmit an RF clock sync signal every 4 hours (standard mode) or 12 hours (economy mode) allowing for a battery life of 5 years or 8 years respectively. The 2.5 and 4 inch digital clocks are powered by an included power adapter and receive and retransmit an RF clock sync signal every minute. Viking also offers a complete line of accessories for the clocks, such as: double mount housings, wire guards, and digital clock surface mount housings.


  • Wirelessly synchronize all clocks in your facility
  • Schools
  • College Campuses
  • Restaurants
  • Churches
  • Theaters
  • Auditoriums
  • Dormitories
  • Office buildings
  • Factories



  • Transmits the CTG-2A RS485 clock sync data wirelessly to the CL-Series wireless clocks
  • Can be configured as a wireless repeater to extend RF transmit range
  • Powerful transmission range: Up to 6500 ft in open space
  • Compact, slim design makes it versatile for mounting
  • Can wirelessly receive and transmit data
  • LEDs for indication of transmission and / or receipt of RS485 signal
  • Powerful 1 Watt (30dBm) transmission
  • Works with Viking’s 915 – 928 MHz frequency hopping technology
  • FCC Part 14 compliance (no license required)


  • Input Voltage: 90 – 230VAC 50 / 60 Hz
  • Housing Dimensions: 11″ x 8″ x 1.7″ (279mm x 203mm x 43mm)
  • Antenna Length: 7″ (178mm)
  • Shipping Weight: 4.9 lbs (2.22 kg)
  • Temperature: 32°F to 122°F (0°C to 50°C)
  • Humidity: 5% to 95% non-condensing
  • Input Signal: RS485 (from Viking CTG-2A)
  • Operating Frequency: 915 – 928MHz frequency hopping technology
  • RF Power Output: 1 Watt (30 dBm), transmits up to 6500 ft in open space
  • Compliance: FCC compliant, part 15, section 15,247 (no license required)
  • Housing: Smooth surface metal enclosure
  • Color: Black
  • Mount: Wall mount


  • FCC Part 15