The Comet CAT-300 1.8–50 MHz Manual Antenna Tuner is a versatile and robust solution designed to enhance the performance of your amateur radio setup across the 160 to 6 meter bands. Whether you're operating from a base station or in the field, this tuner offers precise control and broad compatibility to ensure optimal signal transmission.

Frequency Range and Compatibility

Covering a wide frequency spectrum from 1.8 MHz to 50 MHz, the CAT-300 is engineered to tune various antenna types, including dipoles, verticals, mobile whips, and long wires. This extensive range ensures seamless operation across all HF bands, making it an indispensable tool for amateur radio enthusiasts. 

Power Handling and Performance

The tuner is capable of handling up to 300 watts of Peak Envelope Power (PEP) in SSB mode, accommodating both low and high-power operations. It features two selectable power ranges—30W and 300W—allowing for precise tuning based on your specific transmission requirements. 

Input and Output Impedance

Designed with an input impedance of 50 ohms, the CAT-300 ensures compatibility with standard transceivers. Its output impedance ranges from 10 to 600 ohms, providing flexibility to match a wide array of antenna impedances effectively. 

Precision Cross-Needle Meter

A standout feature of the CAT-300 is its precision cross-needle meter, which simultaneously displays forward power, reflected power, and Standing Wave Ratio (SWR). This real-time feedback is crucial for making informed adjustments to achieve optimal antenna performance. The meter is illuminated for clear readability in low-light conditions when connected to an external 11 to 15 VDC power source. 

User-Friendly Controls

The tuner is equipped with two variable capacitors, labeled "TR Tune" and "X Tune," allowing for fine adjustments to maximize tuning accuracy. A "Band" inductor selector, marked with amateur frequency bands, simplifies the tuning process. Additional features include push-button switches to select between Average or Peak Envelope Power (PEP) readings and to choose between the 30W and 300W power ranges. 

Antenna Connections and Bypass Functionality

The rear panel of the CAT-300 offers two SO-239 connectors and a binding post for long wire antennas, facilitating easy switching between two antennas. A convenient tuner bypass switch allows operators to quickly compare tuned and untuned antenna performance or to operate without the tuner when it's not needed. 

Compact and Durable Design

Weighing approximately 6 pounds and measuring 10 inches in width, 4 inches in height, and 8 inches in depth, the CAT-300 is both compact and sturdy. Its durable construction ensures reliable performance, whether stationed permanently in your shack or used as a portable solution in the field. 

Key Specifications:

• Frequency Range: 1.8 to 50 MHz

• Power Handling: 300W PEP (SSB)

• Input Impedance: 50 ohms

• Output Impedance: 10 to 600 ohms

• Power Range: 30W and 300W

• Meter Illumination Power Requirement: 11 to 15 VDC, approximately 250 mA

• Dimensions: 10" (W) x 4" (H) x 8" (D)

• Weight: Approximately 6 lbs

The Comet CAT-300 1.8–50 MHz Manual Antenna Tuner combines functionality, precision, and ease of use, making it an excellent addition to any amateur radio operator's equipment lineup. Its comprehensive features and robust design ensure that your antenna system performs at its best across a wide range of frequencies and operating conditions.

Note: For additional information, look at the files under the "Documentation" tab.