It was developed in conjunction with NHK and NHK Integrated Technology Inc.
This is a coupling loop interference canceller used for the SFN relay station of the digital terrestrial broadcasting. Because the SFN relay station retransmits with the same channel as the parents station, the it self’s transmission wave turns to the receiving antenna and interferes it self. This is a device that denies this coupling loop interference wave electrically, and enables the FNS broadcast wave relay. It is possible to correspond to various installation environments of the relay station because a coupling loop interference wave at long delay time can be denied.
JIS rack mount type
External size: 480(W) x 49(H) x 400(D)mm (Excluding protrusions)
Mass: 6.0kg or less
| Input | Frequency | 37.15MHz (center frequency) |
| Frequency range | ±10kHz | |
| Level | -10dBm±5dB | |
| Impedance | 50Ω/BNC type (Unbalance) | |
| Output | Frequency | 37.15MHz (center frequency) |
| Level | -10dBm±0.5dB | |
| Impedance | 50Ω/BNC type (Unbalance) | |
| Power supply voltage | DC48V±15% or less | |
| Power consumption | 40W or less | |
| Use conditions | Continuous use | |
| Environmental requirements |
Temperature | -10°C to +45°C (Range for in-spec) |
| -20°C to +60°C (Range for spec restorable) | ||
| Humidity | 45% to 90%RH (Without dew.) | |
| Range of coupling loop interference cancel |
Limited D/U | -13dB or less | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Range of delay time |
126μs or less(Contains the delay time of the relay station equipment and the coupling loop interference canceller) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equivalent C/N after coupling loop interference cancel |
Static characteristic |
35dB or more [Condition]
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Dynamic characteristic |
32dB or more(Doppler frequency 3Hz) 28dB or more(Doppler frequency 5Hz) 23dB or more(Doppler frequency10Hz) [Condition]
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| Equivalent C/N after coupling loop interference cancel is calculated excluding noise element of high-ranking station signal and thermal noise element in reception part. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Delay time of coupling loop interference contains the delay time of the relay station equipment and the coupling loop interference canceller | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Range of multi pass equalization |
Limited D/U | 6dB or more | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Range of delay time |
-1μs to 126μs | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equivalent C/N after multi pass equalization |
Static characteristic |
35dB or more(coupling loop interference wave: 0) 32dBor more(coupling loop interference wave:1) [Condition]
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| Dynamic characteristic |
35dB or more(coupling loop interference wave: 0) 32dBor more(coupling loop interference wave:1) [Condition]
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| Equivalent C/N after equalization is calculated excluding noise element of high-ranking station signal and thermal noise element in reception part. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Delay time of coupling loop interference contains the delay time of the relay station equipment and the coupling loop interference canceller. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interference-proof performance |
Do not oscillate in the following conditions. [Condition]
Multi wave change model A
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| Delay time of device | 15±2μs or less | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Frequency characteristic |
1.0dBp-p or less at fc±2.79MHz [Condition] coupling loop interference wave: 0 |
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| IM | -50dB or less | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Spurious characteristic |
-60dBc or less against the average output.(IM is excluded.) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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