Comet CFX-431A Triplexer/RF Combiner-Splitter, 1.3–150 MHz & 350–500 MHz & 840–1400 MHz, 1000 W PEP (HF) / 500 W & 200 W, 50 dB Isolation, N-Female & PL-259

The Comet CFX-431A Triplexer is a high-performance RF component engineered for amateur device operators, repeater builders, and RF infrastructure professionals who require efficient multiband combining or splitting. This triplexer supports three distinct frequency ranges — 1.3–150 MHz (HF/VHF), 350–500 MHz (VHF/UHF mid), and 840–1400 MHz (UHF / 23 cm) — allowing seamless operation across widely separated bands using a single transmission line. Internally, the CFX-431A uses precision band-pass filters to ensure each path remains clean and isolated without sacrificing signal strength. The insertion loss is remarkably low: approximately 0.25 dB on both the low (1.3–150 MHz) and mid (350–500 MHz) bands, and about 0.30 dB on the high (840–1400 MHz) band. This low loss minimizes wasted power and ensures that transmitted signal integrity and received signal quality remain high. In terms of power handling, the triplexer is built to support demanding environments: it can handle up to 1,000 W PEP on the low-frequency path (1.3–150 MHz), 500 W on the mid band (350–500 MHz), and 200 W on the high band (840–1400 MHz). This makes it well-suited for powerful base stations, repeaters, or multi-transmitter setups. One of the most critical aspects of a triplexer is isolation — signal bleed between paths can wreak havoc in multi-device systems. The Comet CFX-431A delivers 50 dB of isolation between its ports, which greatly reduces the risk of cross-modulation, intermodulation, or TVI when combining or splitting signals. The physical connector configuration is designed for flexibility and reliability. The common port uses an N-type female connector, while the low-pass (1.3–150 MHz) output is provided via a PL-259 lead, and the mid- and high-pass ports (350–500 MHz, 840–1400 MHz) are supplied on N-male coax leads. This means you can mount the triplexer in a convenient location and run standard coax jumpers to your devices or antennas. Mechanically, the unit is compact and rugged, making it suitable for installation in a device shack, tower base, or other RF infrastructure. The combination of high power handling, low insertion loss, and strong isolation makes the CFX-431A particularly effective for setups where three separate devices or antennas must interface to a single common feed line, or where a tri-band device needs to be split into separate independent paths. Whether you are using it as a combiner (merging three devices into a single triband antenna) or as a splitter (splitting one triband device into three separate antenna ports), the Comet CFX-431A offers a professional-grade, reliable solution for multi-band RF management.

• Combines or splits three frequency bands — HF (1.3–150 MHz), VHF/UHF mid (350–500 MHz), and UHF/high (840–1400 MHz) — for multi-band setups
• Extremely low insertion loss: ~0.25 dB on the low (1.3–150 MHz) and mid (350–500 MHz) paths, ~0.30 dB on the high-frequency path (840–1400 MHz), preserving transmit/receive power
• High power handling: up to 1,000 W PEP on the HF band, 500 W on the mid band, and 200 W on the high band — supports demanding transmitters
• Excellent isolation of 50 dB between each port dramatically reduces cross-modulation and minimizes TVI (television interference) risk
• Rugged and flexible connector layout: common port is N-female, low-pass is PL-259 with coax lead, and both mid- and high-pass ports use N-male coax leads