Bird 1000W假负载8251
1 kW, Oil-Cooled Terminations The 8251 Series are portable, self-contained general purpose 50 ohm coaxial transmission line terminations requiring no outside power source or additional equipment. The loads are Oil-assisted convection cooling for safe, continuous operation up to 1000W full rated power. They provide accurate, dependable, and practically nonreflective termination for testing and adjusting transmitters under nonradiating 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. · This series has includes 8251D and 8251D7-16 models for Digital BroadcastVSWR = 1.065 max., 470-860 MHz
8251 Series, Terminations
Model
Connector
8251
LC connector installed and an additional QC-N connector for lower-power testing
8251N
QC-N connector for lower-power testing.
8251D
1-5/8" EIA, Flanged
8251D7-16
7/16-DIN (F)
Power Rating (Watts)
1000 continuous
Frequency Range and VSWR
DC - 1 GHz @ 1.1 max. 1 GHz - 2 GHz @ 1.25 max. 2 GHz to 2.4 @ 1.3 max. 1.065 max., 470-860 MHz for "D" Models
Coolant
1.1 gal. (4.1 liters) Silicon Oil
Product Type
Oil-Cooled
Ambient Temp Range [°C (°F)]
-40°C to +45°C
Operating Position
Horizontal only
Connector(s)
See Chart
Finish
Gray Powder Coat
Nominal Size [inches (mm)]
17-29/32" x 5-15/16" x 8-1/2" (L x W x H) 455 x 151 x 216 mm
Weight [lbs (kg)]
25 lbs., 8 oz. (11.5 kg)
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