1000 Watt, Oil-Cooled RF Termination
8251 Series, RF Loads are portable, self-contained general purpose 50 ohm coaxial transmission line RF 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 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.
Note:
This series includes Models 8251D and 8251D7-16 for Digital Broadcast
(VSWR = 1.065 max., 470-860 MHz)
Model Selection
| 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) |
Item Name
1 kW, Oil-Cooled Terminations
Power Rating
1000 W 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
Temperture Range
-40 to +45 °C
Coolant
1.1 gal. (4.1 liters) Silicon Oil
Operating Position
Horizontal Only
Connectors
See Model Matrix
Dimensions
17-29/32 in x 5-15/16 in x 8-1/2 in (L x W x H) (455 mm x 151 mm x 216 mm)
Weight
25 lb, 8 oz (11.5 kg)