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Need help?Do you have a question about the Comet Antenna CAT-300 and is the answer not in the manual?
The Comet CAT-300 is a manual antenna tuner designed to optimize the performance of amateur radio systems across a wide range of bands. It facilitates efficient power transfer between a transmitter and various antenna types, including dipoles, verticals, mobile whips, and long wire antennas.
The primary function of the CAT-300 is to match the impedance of a transmitter to that of an antenna, thereby minimizing reflected power and achieving a low Standing Wave Ratio (SWR). This ensures that the maximum possible power from the transmitter is radiated by the antenna, improving signal strength and clarity.
The device incorporates a precision cross meter that simultaneously displays forward power (FWD), reflected power (REF), and SWR. This allows operators to monitor the tuning process in real-time and make precise adjustments. The meter scale is illuminated, which is particularly useful for operation in low-light conditions, requiring an external DC power supply.
The tuning process involves adjusting two main controls: "TR TUNE" and "X TUNE." The "TR TUNE" knob controls a variable capacitor on the input (transmitter) side, while the "X TUNE" knob controls a variable capacitor on the output (antenna) side. These adjustments allow the operator to manipulate the impedance matching network to achieve the desired SWR.
A "BAND" switch allows selection of the appropriate frequency band (1.8 MHz - 50 MHz), ensuring the tuning components are configured for optimal performance within that range. The "ANTENNA" switch enables selection between two antenna inputs (ANT1 or ANT2) for coaxial connections, or a dedicated terminal for single-wire antennas (ANT2 Terminal).
The "TUNER" switch allows the operator to enable or disable the antenna tuner function. When set to OFF, the CAT-300 acts solely as an SWR meter, allowing for monitoring without active tuning. An "AVG/PEP" switch determines whether power measurements are displayed as average or peak envelope power (PEP).
The CAT-300 is designed for ease of use, with a clear layout of controls and indicators.
Connection Procedures: High-quality 50-Ohm coaxial cables (e.g., 3D-2V, 5D-2V, RG-8X, RG-213, or "400" type) are recommended for connecting the radio to the CAT-300 and the CAT-300 to the antenna(s). For long wire antennas, the dedicated ANT2 terminal should be used, and the ground wire connected to the GND terminal. It is crucial to connect the CAT-300 to an earth ground via the GND terminal to reduce TVI (Television Interference) and BCI (Broadcast Interference).
Operation for Reception (SWL): For reception-only use, the TUNER switch should be enabled. The BAND switch, TR TUNE, and X TUNE controls are then adjusted to maximize the received signal level. A provided tuning table offers starting point settings for these adjustments.
Operation for Transmission:
The CAT-300 is designed for reliable operation with minimal maintenance.
Precautions for Longevity:
The CAT-300 is manufactured to strict quality standards, but users are advised to inspect the unit upon receipt for any shipping damage. In case of damage, the dealer should be contacted. Regular cleaning of the exterior with a soft, dry cloth is generally sufficient for maintenance. The product's appearance and specifications are subject to change without notice for continuous improvement.
General| Brand | Comet Antenna |
|---|---|
| Model | CAT-300 |
| Category | Tuner |
| Language | English |
