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Relay Compositions of DTV Relay Stations

 

CU21CL: Coupling loop interference canceller (Height=50mm)

(Product code: 6585)

Front view of CU21CL: Coupling loop interference canceller (Height=50mm)
Front view

It was developed in conjunction with NHK and NHK Integrated Technology Inc.


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]
  • Equivalent C/N of high-ranking station signal:45dB
  • Thermal noise in reception part: 30dB
  • Coupling loop interference wave: 1wave, D/U=-8dB
  • Coupling loop interference delay time: 113μs or less

Dynamic

characteristic

32dB or more(Doppler frequency 3Hz)
28dB or more(Doppler frequency 5Hz)
23dB or more(Doppler frequency10Hz)
[Condition]
  • Equivalent C/N of high-ranking station signal: 45dB
  • Thermal noise in reception part: 30dB
  • Coupling loop interference wave: 1wave, D/U=0dB
  • Coupling loop interference delay time: 25μs
  • Change pattern: Doppler change
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]
  • Equivalent C/N of high-ranking station signal: 45dB
  • Thermal noise in reception part: 40dB
  • Multi pass wave: 1wave, D/U=8dB
  • Multi pass delay time: -1μs to 113μs or less
  • Coupling loop interference wave: 1wave, D/U=0dB (no change)
  • Coupling loop interference delay time: 25μs
Dynamic
characteristic
35dB or more(coupling loop interference wave: 0)
32dBor more(coupling loop interference wave:1)
[Condition]
  • Equivalent C/N of high-ranking station signal: 45dB
  • Thermal noise in reception part: 40dB
  • Multi pass wave: 1wave, D/U=12dB
  • Multi pass delay time: -1μs to 113μs or less
  • Multi pass change pattern: Doppler change
  • Coupling loop interference wave: 1wave, D/U=0dB (no change)
  • Coupling loop interference delay time: 25μs
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]
  • Equivalent C/N of high-ranking station signal: 45dB
  • Thermal noise in reception part: 10dB
  • Interference wave of same channel analog: D/U=10dB(NTSC Modulation)
  • Coupling loop interference wave: Multi wave change model A
  • Coupling loop interference D/U: -8dB(average)

 

Multi wave change model A
Wave No. Status Delay time Phase D/U
1 no change 0.00μs 99° 13dB
2 no change 0.12μs 30° 9dB
3 no change 0.25μs 0dB
4 Rayleigh change 0.37μs 1.5Hz 10dB
5 Rayleigh change 0.62μs 1.0Hz 10dB
6 no change 0.98μs -80° 6dB
7 no change 1.23μs 21° 14dB
8 no change 1.35μs 14dB
9 no change 1.60μs -32° 14dB
10 no change 1.85μs 36° 19dB
11 no change 2.10μs 55° 24dB
12 no change 3.08μs 15dB
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
IM -50dB or less
Spurious
characteristic
-60dBc or less against the average output.(IM is excluded.)

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