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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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25th Sep 2020, 11:01 pm | #81 |
Dekatron
Join Date: Jan 2003
Location: Bradford on Avon, Wiltshire, UK.
Posts: 3,301
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Re: Old TV blamed for modern technology not working
Tv in question was apparently a DVD combo, but not exactly sure how old.
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25th Sep 2020, 11:26 pm | #82 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: Old TV blamed for modern technology not working
Thinking about the problem it's more like a handshaking problem over a data network, where noise starts to interfere with proper transmission. Sender sends out packages with a checksum and receiver sends back a checksum to verify proper receipt. Only the noise over the network corrupts the checksum that's being returned .So proper transmission is delayed ( and hence a speed reduction) untill both parties can achieve a checksum parity.
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26th Sep 2020, 12:50 am | #83 | ||
Hexode
Join Date: Oct 2012
Location: London, UK.
Posts: 497
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Re: Old TV blamed for modern technology not working
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26th Sep 2020, 1:11 am | #84 |
Octode
Join Date: Mar 2006
Location: Watford, Hertfordshire, UK.
Posts: 1,270
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Re: Old TV blamed for modern technology not working
As a TLO for GEC Radio & Television, I was called out to a weird one in a line of terraced houses. Owner of a GEC Colour set complained of the picture going to Black and White when neighbour turned on their TV. They had both sets positioned in the same place so there was close coupling via the wall. The neighbour offered to move her set which sorted the problem but I could never understand how one set could remotely turn on the colour killer.
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26th Sep 2020, 2:21 am | #85 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,185
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Re: Old TV blamed for modern technology not working
My speculation: The colour decoder uses the hsync to lock to the burst. If that circuit picks up the other sets horiontal deflection (which is the strongest radiated signal in most cases), the decoder won't work properly.
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26th Sep 2020, 5:25 am | #86 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Old TV blamed for modern technology not working
If the set in Wales is old, it must have been used with a DVB-T set top box.
Signals along fibres can be affected by magnetic fields because specially doped fibre can be used as a flux sensor, but ordinary fibres and the sort of flux which can be generated by something running off a 13A fuse, no, I don't think so. So whatever the TV was creating had to be disrupting the coppery part of the network between the cabinet and the consumers. Or between the consumers and the exchange. If a whole village is being disrupted then I would think the TV would need to couple into somewhere a lot of the circuits concentrate. Leakage of EMC is normally a 2-way thing, so using a portable receiver to look around for leakage of xDSL 'noise' may point to a vulnerability in the network. David
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