Bird 8740 – Water-Cooled RF Termination (20kW)

The Bird 8745/8746 Termaline Load Resistor is designed as a compact, low-reflection, and non-radiating termination or RF transmission lines. Cooled by internal water flow, it generates almost no surface heat, making installation space minimal and convenient. The load can safely dissipate up to 20 kilowatts of continuous power when used in a 50-ohm coaxial transmission line system.

These loads are intended for use on CW, AM, FM, SSB, and TV modulation envelopes, and within certain limitations on radar or pulse modes. They feature a small size and may be carried easily, used in any position, and installed anywhere there is a source of potable water.

A flow rate of up to 8 gallons (30.4 liters) per minute is required.

• Power Rating: 20kW Continuous
• Frequency Range: 1kHz – 900MHz
• VSWR: 1.10 (max)
• Impedance: 50 Ohms

When used in conjunction with a Bird Model 6810 Series Thruline Wattmeter or 3127 Series Panel Meters, these RF load resistors may be used for direct reading power measurements up to 20 kilowatts.

Coupling kits for this product series are listed below:

• 8745: 4240-220
• 8746: 5-726