This is a canceller that removed the interference by the co-channel’s digital and analog wave at the relay station of the digital terrestrial broadcasting.
After decreasing the multi pass obstruction by synthesis and equalization , it is possible to retransmit compared with CN of 40dB or more that satisfies a standard communication circuit design because it judges the signal point.
| Sub-rack | External size | 480(W) x 99(H) x 450(D)mm (Excluding protrusions) |
| Mass | 6.0kg or less | |
| Units of co-channel interference canceller |
External size | 215(W) x 99(H) x 405(D)mm (Excluding protrusions) |
| Mass | 6.0kg or less |
| Co-channel interference cancellation | Removes the interference by the co-channel’s digital and analog wave. |
| Multi pass equalization | Compensates the frequency response for the distortion of the multi pass. |
| Symbol judgment processing | Improves equalization C/N by symbol -judging the signal after synthesis and equalization. |
| IF input | Level | -10dBm±5dB |
| Impedance | 50Ω | |
| Center frequency | 37.15MHz | |
| IF output | Level | -10dBm±0.5dB |
| Impedance | 50Ω | |
| Center frequency | 37.15MHz | |
| Standard frequency signal input |
Level | 0dBm±3dB |
| Impedance | 50Ω | |
| Center frequency | 10MHz | |
| Number of array elements | 2 or 3 | |
| Interference removal performance | 35dB or more (tentative)Equivalent C/N excluding equivalent noise of high-ranking station signal. | |
| [Condition] Array element's interval: 5λ Arrival angular difference: 3degrees Interference wave: Uncorrelated digital wave 1 Equivalent C/N of high-ranking station signal:45dB or more D/U o interference wave: 10dB Number of array elements: 2 Range where influence of gray Tin glove is not received. |
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| Symbol judgment processing function | The presence of the judgment can be switched. | |
| Equivalent C/N After symbol judgment processing |
42dB or more (tentative)Contains deterioration by the jitter of a synchronous reproduction. | |
| [Condition]]Multi pass:NonEquivalent C/N before symbol judgment processing:28dB | ||
| Delay time of device | 8ms or less | |
| Alarm monitoring output | Power failure, device abnormal, output abnormal | |
| Power supply voltage | +48V ±15% or less | |
| Power consumption | 100W or less | |
| Environmental requirements |
Temperature | -10°C to +50°C |
| Humidity | 45% to 90%RH (Without dew.) | |
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