RAFD-2
Antenna system
Stationary Antenna - Feeder System KH - wave range with reversible (two-way) reception
A highly directional, wide-band stationary antenna-feeder system is designed for round-the-clock unswitched reception of radio signals in the operating frequency range of 2.0...30.0 MHz from two opposite sides (reversible reception) from radio emission sources at distances up to 6000 km.
Provides:
transmission of received radio signals via a feeder coaxial line to the input of the high-frequency path of the receiving radio center without distortion and with minimal energy losses without the use of active intermediate amplifiers;
operation in round-the-clock mode;
resistance to the influence of environmental factors (rain, snow, lightning discharges, icing, etc.).
Four AFS have been built
| Technical specifications | |
|---|---|
| Frequency range | 2-30.0 MHz |
| Height of antenna blade suspension | not less than 29 m |
| Standing wave coefficient | not more than 1.9 |
| The width of the directivity diagram in both main planes is | |
| lobe in the horizontal plane at a frequency of 12.5 MHz | 30° |
| lobe in the vertical plane at a frequency of 12.5 MHz | 10° |
| Permissible level of side lobes | 5 dB |
| Directionality coefficient | 8-12d Bi |
| Efficiency | 20-60% |
| Return loss | not less than 10 dB |
| Dimensions of the antenna blade | |
| width | not more than 3 m |
| length | not more than 102 m |
| Attenuation coefficient in the feeder coaxial line | |
| at a frequency of 10 MHz | not more than 0.36 dB / 100 m |
| The impulse resistance to the grounding conductor does not exceed | |
| lightning protection | not more than 20 Ohm |
| protective grounding, | not more than 4 Ohm |
| Operating temperature range | -20...+45° C |
| Limit temperature range | -30...+55° C |
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