8251 Series – 1kW, Oil-Cooled RF Termination
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 in EIA, Flanged |
| 8251D7-16 | 7/16 Jack, IEC |
| Product | Description |
|---|---|
| Item No | 8251 Series |
| 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 |
| Temperature Range | -40° to +45°C |
| Coolant | 1.1 gal. (4.1 liters) Silicon Oil |
| Product Type | Oil-Cooled |
| Operating Position | Horizontal Only |
| Connectors | See Model Matrix |
| Finish | Gray Powder Coat |
| Dimensions | 18 in x 6 in x 8.5 in (455 mm x 151 mm x 216 mm) |
| Weight | 25 lb, 8 oz (11.5 kg) |
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