Bird - The RF Experts
8770 Series
8770 Series, 50 kW, Water-Cooled Terminations
8770 Series

8770 Series, 50 kW, Water-Cooled Terminations are designed as compact, low VSWR and non-radiating terminations for high-power transmitter/transmission line systems. The units generate 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
  • Requires flow rate of up to 11 gallons (41.8 liters) per minute
8770 Series, Terminations
Model Connector
8775 3-1/8" EIA, Flanged
8776 3-1/8" EIA, Unflanged (Flush)
product specifications:
Item No
8770 Series
Item Name
50 kW, Water-Cooled Terminations
Power Rating
50 kW continuous
Frequency Range and VSWR
1.1 max. 1 kHz - 900 MHz (DC for continuity checks)
Coolant
Potable Water
Water Temperture Range
+5 to +60°C
Water Flow Rate
9 gal./minute @ 5 °C to 11 gpm @ 60 °C
(34.2 liters/minute @ 5 °C to 41.8 lpm @ 60 °C)
Product Type
Water-Cooled
Operating Position
Any
Waterlines
1/2" FPT or 3/4" hose
Connectors
See Model Matrix
Input Flange Diameter
5-3/16" Dia. (132 mm)
Finish
Black Powder Coat
Dimensions
19-1/2" L x 3-1/2" Dia.
495 x 90 mm
Weight
15 lbs. 13 oz. (7.2 kg)
accessories - Moddel 8775:
4240-220
7/8" Coupling Kit
6770-125
Wall Mount Bracket
accessories - Model 8776:
5-726
3-1/8" UnFlanged Connector-Flush Coupling Kit
6770-125
Wall Mount Bracket