| 31. | These include EDF, fused-fibre optical couplers and optical isolators.
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| 32. | Since 1969 the ore trains have been using the Soviet SA3 coupler.
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| 33. | Directional couplers or two resistor power dividers are used for signal separation.
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| 34. | The same is true for cables and couplers inside the network analyzer.
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| 35. | In actual couplers the isolated port is never completely isolated.
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| 36. | This synonymously meant a quadrature coupler with outputs 90?out of phase.
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| 37. | Two important safety items, Janney couplers, were adopted in 1903.
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| 38. | These can be used in conjunction with the standard eight foot coupler.
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| 39. | The inclusion of these couplers allows for greater registrational flexibility and color.
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| 40. | In Singapore, all trains ( except APMs ) uses Scharfenberg couplers.
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