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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
Posted to uk.d-i-y
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Very poor suppression
Two devices bought this week. Both work OK but the problem is that their
power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is listening to the short waves and even medium and long waves, so its all a bit depressing to find that in order to continue both items need to be off. One, the DVD has the psu inside its box and the on off switch does not seemingly turn off the psu, which whines away at various places in the spectrum, but the True Call cal screening device, although it works fine puts out a nasty load of birdies quite close together which move as you do various things on the unit or remotely, and have a 50 hz buzz on them for good measure. I may ask the company if they know of a source of old fashioned psus for it as it has a very tiny right angled plug on the end of the wall wart wire. Life is just getting very depressing when you consider how long we have been making switch mode devices, surely we should expect better by now! Brian -- From the Sofa of Brian Gaff Reply address is active Remember, if you don't like where I post or what I say, you don't have to read my posts! :-) |
#2
Posted to uk.d-i-y
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Very poor suppression
On 13/12/2015 09:04, Brian-Gaff wrote:
Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. You need the Aulterra Whole House Neutralizer as mentioned in one of the recent Russ Andrews threads -- mailto: news {at} admac {dot] myzen {dot} co {dot} uk |
#3
Posted to uk.d-i-y
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Very poor suppression
I doubt one could retro fit anything to anything to cope with this. the
components need to be in the power supplies and in some cases the design is so bad that the little transformer saturates and makes things much worse as everything has sharp edges and lots of harmonics. The dvd is a cheap Panasonic, but it sounds very good, though I've not managed to work out how to play a cd yet without it muting between tracks as if you had select the tracks manually, not just let it play the whole cd. Annoying on some classical sound effect and segway type material. the True call looks like a coommon Chinese type wall wart to me. Brian -- From the Sofa of Brian Gaff Reply address is active Remember, if you don't like where I post or what I say, you don't have to read my posts! :-) "alan_m" wrote in message ... On 13/12/2015 09:04, Brian-Gaff wrote: Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. You need the Aulterra Whole House Neutralizer as mentioned in one of the recent Russ Andrews threads -- mailto: news {at} admac {dot] myzen {dot} co {dot} uk |
#4
Posted to uk.d-i-y
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Very poor suppression
Brian-Gaff wrote
I doubt one could retro fit anything to anything to cope with this. the components need to be in the power supplies To get the best result anyway. and in some cases the design is so bad that the little transformer saturates and makes things much worse as everything has sharp edges and lots of harmonics. The obvious thing to do is replace the wall wart with one of the older linear ones with an iron cored transformer. You could also replace it with a better designed switcher but it would be rather harder to work out which is better designed particularly when buying them on ebay or amazon etc. The dvd is a cheap Panasonic, but it sounds very good, though I've not managed to work out how to play a cd yet without it muting between tracks as if you had select the tracks manually, not just let it play the whole cd. Annoying on some classical sound effect and segway type material. The original question might be rather academic if you decide that that behaviour is not acceptable and return it for a full refund under the sale of goods act. the True call looks like a coommon Chinese type wall wart to me. Yeah, haven't noticed many of those brands that put too much effort into the design of the wall wart now except Apple and I haven't checked the Apple ones for interference either but it should be easy to borrow and Apple one to try. Hardly any normal wall warts tho, they don’t even bother to supply a car charger for their phones and ipads. alan_m wrote Brian-Gaff wrote Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. You need the Aulterra Whole House Neutralizer as mentioned in one of the recent Russ Andrews threads |
#5
Posted to uk.d-i-y
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Very poor suppression
On Sun, 13 Dec 2015 09:04:46 +0000, Brian-Gaff wrote:
Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is listening to the short waves and even medium and long waves, so its all a bit depressing to find that in order to continue both items need to be off. Yeah, those cheap Chinese switchers are a menace. You need a linear supply you reckon? Try these: http://www.maplin.co.uk/search?text=...supply&x=0&y=0 |
#6
Posted to uk.d-i-y
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Very poor suppression
I firstly need a talking meter to find out what the voltage and polarity is
though. On the Panasonic dvd, I think a switch may have to be purchased for the plug end, as no way will I be delving in there,and besides, its probably not just the psu, but the various circuits in the player, but when one considers the cost its bloody amazing that it sounds so good. It also placys files on ramsticks and cds as well as rewritable cds, an everything else except blue rays and is multi region. Brian -- From the Sofa of Brian Gaff Reply address is active Remember, if you don't like where I post or what I say, you don't have to read my posts! :-) "Cursitor Doom" wrote in message ... On Sun, 13 Dec 2015 09:04:46 +0000, Brian-Gaff wrote: Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is listening to the short waves and even medium and long waves, so its all a bit depressing to find that in order to continue both items need to be off. Yeah, those cheap Chinese switchers are a menace. You need a linear supply you reckon? Try these: http://www.maplin.co.uk/search?text=...supply&x=0&y=0 |
#7
Posted to uk.d-i-y
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Very poor suppression
On Sun, 13 Dec 2015 14:17:43 +0000, Brian-Gaff wrote:
I firstly need a talking meter to find out what the voltage and polarity is though. On the Panasonic dvd, I think a switch may have to be purchased for the plug end, as no way will I be delving in there,and besides, its probably not just the psu, but the various circuits in the player, but when one considers the cost its bloody amazing that it sounds so good. It also placys files on ramsticks and cds as well as rewritable cds, an everything else except blue rays and is multi region. Brian Surely to god there's someone in your area who could do this for you? If you're visually impaired there should be some support available, I'd have thought? |
#8
Posted to uk.d-i-y
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Very poor suppression
In article ,
"Brian-Gaff" writes: Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is listening to the short waves and even medium and long waves, so its all a bit depressing to find that in order to continue both items need to be off. One, the DVD has the psu inside its box and the on off switch does not seemingly turn off the psu, which whines away at various places in the You could try looping all the connections to it through large ferrite toroids as near to the case as you can get them. The mains lead is probably the most critical. spectrum, but the True Call cal screening device, although it works fine puts out a nasty load of birdies quite close together which move as you do various things on the unit or remotely, and have a 50 hz buzz on them for good measure. Replcement wall-warts are easily and cheaply available. You may even have a suitable one laying around. I may ask the company if they know of a source of old fashioned psus for it as it has a very tiny right angled plug on the end of the wall wart wire. Life is just getting very depressing when you consider how long we have been making switch mode devices, surely we should expect better by now! Another option might be a better radio aerial, so the radio can run with the AGC lower, and not amplify the interference so much. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#9
Posted to uk.d-i-y
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Very poor suppression
On Sunday, 13 December 2015 11:58:12 UTC, Andrew Gabriel wrote:
In article , "Brian-Gaff" writes: Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is Replcement wall-warts are easily and cheaply available. You may even have a suitable one laying around. Be aware that all new ones are switched mode these days. Get an old heavy one. I may ask the company if they know of a source of old fashioned psus for it as it has a very tiny right angled plug on the end of the wall wart wire. Life is just getting very depressing when you consider how long we have been making switch mode devices, surely we should expect better by now! they're better in that they're cheaper. Another option might be a better radio aerial, so the radio can run with the AGC lower, and not amplify the interference so much. or put the PSU in an earthed biscuit tin, with ferrites & caps on in & outputs. NT |
#11
Posted to uk.d-i-y
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Very poor suppression
The aerial is outside and it would be hard to get it much further away than
it is. Of course today, another idiot has installed over the mains internet, so now we have clicking noises whining sounds and very strange warbles. Must be a person fairly close with a the powerline adaptor. Its almost getting to the point where the only people who can listen are those in huge places devoid of human habitation with the gear running of batteries. Down the road from me is a factory which makes and refurbisheds machine tools. When we drive by in a taxi his radio is obliterated by a severe whining noise. Nobody cares it seems. Brian -- From the Sofa of Brian Gaff Reply address is active Remember, if you don't like where I post or what I say, you don't have to read my posts! :-) wrote in message ... On Sunday, 13 December 2015 11:58:12 UTC, Andrew Gabriel wrote: In article , "Brian-Gaff" writes: Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is Replcement wall-warts are easily and cheaply available. You may even have a suitable one laying around. Be aware that all new ones are switched mode these days. Get an old heavy one. I may ask the company if they know of a source of old fashioned psus for it as it has a very tiny right angled plug on the end of the wall wart wire. Life is just getting very depressing when you consider how long we have been making switch mode devices, surely we should expect better by now! they're better in that they're cheaper. Another option might be a better radio aerial, so the radio can run with the AGC lower, and not amplify the interference so much. or put the PSU in an earthed biscuit tin, with ferrites & caps on in & outputs. NT |
#12
Posted to uk.d-i-y
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Very poor suppression
On Sun, 13 Dec 2015 14:22:30 +0000, Brian-Gaff wrote:
Down the road from me is a factory which makes and refurbisheds machine tools. When we drive by in a taxi his radio is obliterated by a severe whining noise. Nobody cares it seems. I share your pain, bro. Plus I have to inspect signals down to -120dBm! |
#13
Posted to uk.d-i-y
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Very poor suppression
On 13/12/2015 09:04, Brian-Gaff wrote:
Two devices bought this week. Both work OK but the problem is that their power supplies being of the switch mode kind push out lots of annoying RF at frequencies between 100khz and around 20mhz. One of my hobbies is listening to the short waves and even medium and long waves, so its all a bit depressing to find that in order to continue both items need to be off. One, the DVD has the psu inside its box and the on off switch does not seemingly turn off the psu, which whines away at various places in the spectrum, but the True Call cal screening device, although it works fine puts out a nasty load of birdies quite close together which move as you do various things on the unit or remotely, and have a 50 hz buzz on them for good measure. I may ask the company if they know of a source of old fashioned psus for it as it has a very tiny right angled plug on the end of the wall wart wire. Life is just getting very depressing when you consider how long we have been making switch mode devices, surely we should expect better by now! Brian You could try putting ferrite chokes onto their PSU cables - it might help a bit by preventing the RF having an aerial lead to radiate from. http://www.maplin.co.uk/p/ferrite-clip-on-hem3012-n89ab (Cheaper from proper components suppliers but MOQ applies) -- Regards, Martin Brown |
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