Bird - The RF Experts

5 kW, Direct Water-Cooled RF Termination

8720, RF Load is designed as a compact, low VSWR and non-radiating termination for high-power transmitter/transmission line systems. It generates almost no ambient heat, making installation space minimal and convenient, in any position. The RF power is converted to heat in the hollow resistive film load resistor and directly absorbed by the water flowing through it.

  • Broadband water-cooled load for long-term RF dissipation when heat must be efficiently transferred away from the area
  • Small size may be carried easily, used in any position and installed anywhere there is a source of potable water
  • 1-5/8 EIA Flange allows termination of full 5000 W over d.c. to 2 GHz
  • Requires flow rate of 1 gallon (3.8 liters) per minute
product specifications:
Item No
Item Name
5 kW, Direct Water-Cooled Terminations
Power Rating
5 kW continuous
Frequency Range and VSWR
DC to 500 MHz @ 1.10 max.
500 MHz to 900 MHz @ 1.15 max.
900 MHz to 2000 MHz @ 1.25 max.
Potable Water
Water Temperture Range
+5 to +80°C
Water Flow Rate
1 gal./minute @ 5 °C to 6 gpm @ 80 °C
(3.8 liters/minute @ 5 °C to 15.21 lpm @ 80 °C)
Product Type
Direct Water-Cooled
Operating Position
1/4 in FPT
1-5/8 EIA, Flanged
Input Flange Diameter
3 1/2 in
Bright Nickel Plated
8-1/32 in L x 1-5/8 in dia - Excluding 8 in waterlines (204 mm x 41 mm)
2 lb (900 g)