Bird - The RF Experts
8890-300 Series
2.5 kW, RF Terminations
8890-300 Series

2500W, Oil-Cooled Dry RF Terminations


8890-300 Series, RF Loads are self-contained high-power 50 ohm coaxial transmission line terminations requiring no outside power source or additional equipment. It provides accurate, dependable, and practically non-reflective termination for testing and adjusting transmitters under non-radiating conditions. The load consists essentially of a cylindrical film type resistor immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a special tapered housing which provides a linear reduction in surge impedance directly proportional to the distance along the resistor.

Features
  • Oil-assisted (vented) convection cooling for safe, continuous operation up to 2500W full rated power.
  • Compatible with all Bird QC connectors.
  • Overload thermoswitch P/N 8890-008 is optional. Free assembly when ordered as a package.
Model Selections
Model Connector Recess (In.) Diminsions, L x W x H Weight
8890-300 LC, Female n/a 23-1/8" x 7" x 17-3/16"
(587 x 178 x 437 mm)
57 lbs. (26 kg)
8891-300 3-1/8" EIA, Flanged 0.922 25-1/8" x 7" x 17-3/16"
(638 x 178 x 437 mm)
59 lbs. (27 kg)
8891D-300 3-1/8" EIA, Flanged 0.922 25-1/8" x 7" x 17-3/16"
(638 x 178 x 437 mm)
59 lbs. (27 kg)
8892-300 1-5/8" EIA, Flanged 0.625 23-1/8" x 7" x 17-3/16"
(587 x 178 x 437 mm)
58 lbs. (26 kg)
8892D300 1-5/8" EIA, Flanged 0.625 23-1/8" x 7" x 17-3/16"
(587 x 178 x 437 mm)
58 lbs. (26 kg)
8895-300 1-5/8" EIA, Unflanged 0.438 22-3/16" x 7" x 17-3/16"
(564 x 178 x 437 mm)
58 lbs. (26 kg)
2.5 kW, RF Terminations
8890-300 Series
product specifications:
Item No
8890-300 Series
Item Name
2.5 kW, Oil-Cooled Terminations
Power Rating
2500 W continuous
Frequency Range and VSWR
DC - 1 GHz @ 1.1 max.
1 GHz - 2 GHz @ 1.25 max.
2 GHz - 2.4 GHz @ 1.3 max.
Impedance Ω
50
Coolant
2.9 gal. (11 liters) Silicone Oil
Product Type
Oil-Cooled
Operating Position
Horizontal Only
Connectors
See Model Matrix
Finish
Gray Powder Coat
Dimensions
See Model Matrix
Weight
See Model Matrix
compatible devices:
8890-315 [320] Series
5 kW, Oil-Cooled Terminations with 115 VAC or 230 VAC Blower Assy.