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 Post subject: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 3:15 am 
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Joined: May Thu 14, 2015 4:15 pm
Posts: 2642
Location: Dallas, TX
I don't know how old is "old". Do they still broadcast analog TV in the UK?

https://www.bbc.com/news/uk-wales-54239180

Not much technical details. I would guess if it was a CRT set, the interference could be from the
anode lead or flyback arcing. I'm sure the TV could be corrected.

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 Post subject: Re: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 3:29 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 1149
Location: Belrose, NSW, Australia
Quote:
I don't know how old is "old". Do they still broadcast analog TV in the UK?


No analog in the UK since 24 October 2012.

TV is a 2006 vintage LCD. Not of any interest to us! Interference probably due to a badly-designed snubber in the flyback converter. A common problem.

A later report says that the problem is still there, after the TV was junked!

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 Post subject: Re: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 4:37 am 
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Joined: Jan Sat 25, 2020 5:23 am
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Location: Colorado Springs, CO 80917
Why would an LCD display TV use a flyback?


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 Post subject: Re: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 5:03 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 1149
Location: Belrose, NSW, Australia
Not as you know them! But there are similarities.

The main off-line power supply is what is called an isolated flyback converter.

Here is a link:

https://www.edn.com/power-tips-76-flyba ... derations/

Fig. 3 shows the ringing that happens if there is no effective snubber and how the snubber reduces it. That ringing is the source of most EMI emissions from this topology of power converter.

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 Post subject: Re: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 5:30 am 
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Joined: Jan Sat 25, 2020 5:23 am
Posts: 221
Location: Colorado Springs, CO 80917
I see. What I'd just call a switching supply.


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 Post subject: Re: UK news article about Internet interference
PostPosted: Sep Tue 29, 2020 5:37 am 
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Location: Norfolk, VA
https://antiqueradios.com/forums/viewto ... 2&t=384521

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