8640B Series – 25kW, Forced-Air Cooled Moduload™ RF Terminations
25kW, Forced-Air Cooled Moduload™ RF Terminations
8640B Series, RF Loads are compact high-power 50-ohm loads that efficiently dissipate up to 25 kW of RF over a wide frequency range up to 1 GHz.
Features
- Interlock control circuit provides fail-safe protection of the transmitter and load resistor in the event of an ac power failure to the blower or coolant pump.
- Compact, low-profile design saves space in crowded transmitter sites.
- Available Voltage Options (add suffix to model number).
- 115V @ 60 Hz (-115)
- 230V @ 50 Hz (-230)
- 230V @ 60 Hz (-230-6)
Notes:
- * Below 5°C, ONLY use 35% E.G. and 65% Dist. H2O mixture.
- ** Above 30°C (86 °F) with water only, or 25°C (77 °F) with a 35% ethylene glycol mixture, derate power to 20 kW max.
Model Selections
| Model | Connector |
|---|---|
| 8645B | 3 1/8 in EIA, Flanged |
| 8646B | 3 1/8 in EIA, Unflanged |
| Product | Description |
|---|---|
| Item No | 8640B Series |
| Item Name | 25 kW, Forced-Air Cooled Terminations |
| Power Rating | 25 kW continuous * See note 2 above |
| Frequency Range and VSWR | 1 kHz to 900 MHz @ ≤ 1.1 max (DC for continuity checks) |
| Temperature Range | Water Only: +5° to +45°C (41° to 113°F) 35% Ethylene Glycol: -20° to +35°C (4° to +95°F) * See note 2 above |
| Coolant | Cooling Method: Water dielectric and forced air convection Coolant: Distilled water or distilled water/ethylene glycol mixture Coolant Capacity: 9 qts. (8.5 L) nominal * See note 1 above |
| Product Type | Forced-Air Cooled |
| Operating Position | Horizontal Only |
| Connectors | See Model Matrix |
| Finish | Gray Powder Coat |
| Dimensions | 26 in x 19-5/8 in x 19-1/4 in (L x W x H) (660 mm x 500 mm x 490 mm) |
| Weight | 165 lb (75 kg) |
| Power | 115 V models: 11 A nominal @ 115V ± 10% 60Hz 230 V models: 5-1/2 A nominal @ 230V ± 10% 50Hz |
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