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| 1. |
West Wales Sub-Centre: Chairman's address. Electricity supplies in Rangoon |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 33-33
G.R.T.Edwards,
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PDF (147KB)
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DOI:10.1049/pi-1.1952.0013
出版商:IEE
年代:1952
数据来源: IET
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| 2. |
North-East Scotland Sub-Centre: Chairman's address. Underground distribution networks in towns and cities |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 34-34
J.I.Moir,
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PDF (183KB)
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DOI:10.1049/pi-1.1952.0014
出版商:IEE
年代:1952
数据来源: IET
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| 3. |
North Staffordshire Sub-Centre: Chairman's address. Practice and trends in the applications of mercury-arc rectifiers |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 35-35
J.E.Boul,
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PDF (161KB)
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DOI:10.1049/pi-1.1952.0015
出版商:IEE
年代:1952
数据来源: IET
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| 4. |
Rugby Sub-Centre: Chairman's address. Recent developments in salient-pole alternators” |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 36-36
J.H.Walker,
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PDF (153KB)
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DOI:10.1049/pi-1.1952.0016
出版商:IEE
年代:1952
数据来源: IET
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| 5. |
Hydro-electric power development in Scotland |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 37-42
EdwardMacColl,
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PDF (963KB)
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DOI:10.1049/pi-1.1952.0017
出版商:IEE
年代:1952
数据来源: IET
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| 6. |
S.P. Thompson, 1851–1916 |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 42-43
Arthur P.M.Fleming,
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PDF (295KB)
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DOI:10.1049/pi-1.1952.0018
出版商:IEE
年代:1952
数据来源: IET
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| 7. |
The London-Birmingham television-cable system |
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Proceedings of the IEE - Part I: General,
Volume 99,
Issue 116,
1952,
Page 44-58
T.Kilvington,
F.J.M.Laver,
H.Stanesby,
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PDF (2292KB)
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摘要:
The London-Birmingham television-cable system provides channels for relaying television signals between central points in the two cities, in both directions simultaneously, with extensions to the television transmitters at Alexandra Palace and Sutton Coldfield, a total of five links being involved.The vision-frequency signals modulate a carrier of 6.12 Mc/s at the sending-end, the lower-sideband, the carrier and part of the upper-sideband being transmitted over the cable. The transmission paths are provided by coaxial pairs approximately one inch in diameter, equipped with repeaters nominally at 12-mile intervals, the gain and delay being substantially constant from 3 to 7 Mc/s. In the event of repeater failure, change-over from working to standby repeaters is automatic, and power for some of the intermediate repeater stations is supplied over the coaxial pairs themselves. At the receiving end the signals are passed through an asymmetric-sideband-shaping filter before the vision-frequency signal is recovered by envelope detection.The overall vision-frequency characteristics of the London-to-Birmingham channel, in tandem with the Alexandra Palace and Sutton Coldfield extensions, show a total variation in gain of 0.8 db, and in phase delay of 0.04 microsec for frequencies up to 3 Mc/s. Above this frequency the cut-off is rapid. The performance in respect of linearity, signal/noise ratio and time response is adequate, and photographs are reproduced showing the effect on a television test-pattern of sending signals from London to Birmingham and back.
DOI:10.1049/pi-1.1952.0019
出版商:IEE
年代:1952
数据来源: IET
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