Comet CAT-283 – 250W Antenna Tuning Unit 144/430 MHz (PEP)


Introducing the Comet CAT-283 – 250W Antenna Tuning Unit, the ultimate solution for optimizing your radio frequency performance. With its impressive power handling capability of up to 250W, this unit is designed to meet the demands of even the most powerful transmitters.


The CAT-283 covers a wide frequency range of 144/430 MHz, allowing you to fine-tune your antenna for exceptional signal reception and transmission. Equipped with a built-in duplexer, this unit enables separate tuning for each band, ensuring optimal performance across the board.

Featuring an intuitive cross-needle display, the CAT-283 allows you to monitor important metrics such as FWD, REF, and PWR simultaneously. With its beautifully illuminated display, your readings remain clear and visible even in low-light conditions, providing you with a seamless tuning experience.

When it comes to technical specifications, the CAT-283 truly stands out. Its input impedance of 50 Ohm guarantees efficient power transfer, while the output impedance ranges from 15 to 200 Ohm, catering to a diverse range of needs. With a maximum input power of 250W for FM operation, this unit delivers exceptional performance without compromising on reliability.

Measuring the SWR (Standing Wave Ratio) requires a minimum power input of only 6W, ensuring accurate measurements at lower power levels. The CAT-283 boasts a tolerance of +/- 10%, guaranteeing precise results every time.

For easy connectivity, this unit features an M-J type connector (SO-239), ensuring a secure and reliable connection to your antenna. The lighting power supply operates on a DC voltage range of 11-15 volts, drawing approximately 250 mA, providing a steady and efficient power source.

Compact yet robust, the CAT-283 measures 218 x 93 x 120 mm, making it easy to incorporate into your existing setup. Weighing approximately 1.4 kg, it strikes the perfect balance between portability and durability.

Upgrade your antenna tuning experience with the Comet CAT-283 – 250W Antenna Tuning Unit. Power, performance, and precision come together in this exceptional product to elevate your radio communications to new heights.


  • Frequency Range: 125 – 210 MHz / 400 – 450 MHz
  • Input Impedance: 50 Ohm
  • Out Impedance: 15 – 200 Ohm
  • Max. Input Power: 250W (FM)
  • Min. Power for SWR Measurement: 6W
  • Tolerance: +/- 10%
  • Connector: M-J type (SO-239)
  • Lighting Power Supply: DC 11 – 15 volt, approx 250 mA
  • Dimensions: 218 x 93 x 120 mm
  • Weight: 1.4 kg

Additional information

Weight1.6 kg