De-Coupling an old Valve type TV
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De-Coupling an old Valve type TV
05-09-2011 9:56 AM
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This morning I was attempting to receive an SSTV signal from Basingstoke, when my missus decided to put the big TV on, in the next room, to entertain the GGDaughter... The resulting "mush" completely wiped out the reception of the SSTV signal. I vaguely remember something from my past, when this kind of interference happens, it is necessary to "de-couple" the TV Power plug from the main ring circuit.... BUT... I can`t remember how to do it...or what components to use....
can anyone point me in the right direction, to see if I can minimise this interference, Perhaps I need to de-couple the Eddystone, my Laptop, and other stuff too? Any advice and instructions would be much appreciated.
Re: De-Coupling an old Valve type TV
05-09-2011 10:08 AM
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another one but more expensive is a something like a transformer with a capacitor couple, but never used one
a good source of these odd items is http://www.keene.co.uk/
Re: De-Coupling an old Valve type TV
05-09-2011 12:19 PM
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Doesn't sound like a mains problem to me.
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Re: De-Coupling an old Valve type TV
05-09-2011 12:27 PM
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3Mb FTTC
https://portal.plus.net/my.html?action=data_transfer_speed
Re: De-Coupling an old Valve type TV
05-09-2011 12:31 PM
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Big old CRT TV's use a lot of high-power, high-voltage and high-frequency components, so almost inevitably chuck out a LOT of RF interference as they age so as above, the mains wouldn't be my first suspicion.
Re: De-Coupling an old Valve type TV
05-09-2011 1:35 PM
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Received frequency is 3781 kc/s
SSTV program is Easypal
TIme of transmission is 07:40A daily
Re: De-Coupling an old Valve type TV
01-12-2011 5:51 PM
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This ‘mush’ or ‘hash’ can be radiated from the television via either the mains wiring or via the television antenna.
Remove the television aerial plug from the back of the television whilst both the television and the Eddystone are running and if the ‘mush’ is still present then it is being radiated through the mains wiring. If it disappears then it is being radiated from the television via the aerial.
Electrical suppressors are obtainable that can be fitted between the television and the power socket. These essentially route interfering signals down to earth. They can have the additional advantage that they can suppress interference already on the mains wiring that could interfere with the television.
If it appears that the interference is being radiated from the aerial the cable can be wrapped around a ferrite core or ferrite rod. This is very much a hit and miss exercise. If you know a local ham you may be able to ‘borrow’ some ferrites to try out. You could also pick his brains – we do try and be helpful wherever possible !
Incidentally it may be worth wrapping the television’s mains lead around a ferrite before you spend any money on a suppressor – might just help.
Good luck…
John
Re: De-Coupling an old Valve type TV
01-12-2011 8:56 PM
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Problem solved....
how.? ... Easy....
Moved house,
took the old VALVE TV`s (central heating ) to the British Heart Foundation shop, (who have since sold them on!)...
Regretting selling the Eddystone but have replaced it with an ICOM IC-R71E
and
Bought two new flat screen freeview tv`s !...
Probably a bit drastic, but it works ! ! .
Re: De-Coupling an old Valve type TV
01-12-2011 9:12 PM
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Careful when changing the battery backup.
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
Re: De-Coupling an old Valve type TV
01-12-2011 10:06 PM
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I know about the memory battery ..... getting it changed soon !..
(tks om 73 de Gerry)
Re: De-Coupling an old Valve type TV
01-12-2011 10:42 PM
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To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
Re: De-Coupling an old Valve type TV
01-12-2011 11:04 PM
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But ... don`t worry strat..... I already have the PDF for the manual !..
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