Hello I have 2 computers now. A long time ago I was posting on here how one of my radios had this hissing/whistling noise, and anyway it wasnt the radio at all but the computer that was making it. Well now the original compter has a much more quality supply in it to run the gaming video card. Would you believe the interference is now gone! I paid 179 for the supply. Question is the second computer inhereted the same power supply and guess what, ...boat loads of RFI. I really dont want to spend that much money for another supply, but if any of you should happen to know what to look for in a power supply or where to get one that isnt able to contact aliens with RFI, I would greatly appreciate it.

These are switching supplies... so..Probably all about proper shielding.... y'think?

:actually Im clueless as to whats causing this. Your talking about the way the power supply case is made?
:These are switching supplies... so..Probably all about proper shielding.... y'think? Ok then how does one shield this? My other computer doesnt emit this horrid rfi and both side covers are off of it.

Sean,
Most likely the offending supply is indeed a switching-type supply and the "hash" from the switching transistors is what you are hearing. Switching supplies are cheaper to make and may or may not come shielded well enough to eliminate hash leakage. You can take care of the problem. You will need a selection of ferrite beads and toroids, etc. I am unfamiliar with the details of actually getting the job done because I have zero patience with noise generators of any kind. I just don't allow them under my roof. And that includes the "new" energy efficient bulbs. Rotsa Ruck.
Jim

I too had a problem like that with my home computer. It would totally kill any AM reception while it was running. One day my computer stared working erraticly when cold but OK when warmed up. I pulled the power supply module and checked the supplies with an O'scope. I found lots of ripple on the lines. I then replaced all the electrolytics. Since then my problem has been greatly improved.- Rob

:Sean,
:Most likely the offending supply is indeed a switching-type supply and the "hash" from the switching transistors is what you are hearing. Switching supplies are cheaper to make and may or may not come shielded well enough to eliminate hash leakage. You can take care of the problem. You will need a selection of ferrite beads and toroids, etc. I am unfamiliar with the details of actually getting the job done because I have zero patience with noise generators of any kind. I just don't allow them under my roof. And that includes the "new" energy efficient bulbs. Rotsa Ruck.
:Jim

I've had problems with RFI noise from aftermarket AC adapters used to power AM/SW radios which are most suseptable to any noise. The factory supplied adapters were quiet. I guess noise can get in through the antenna or through the AC line. You can elecrtically filter the offender or offendee to a degree,the FCC regulates this in Part 15. See the label on the device(s).

Sean,
Use a battery set to determine if it is radiated or induced energy into the power circuit, then go from there. There are lots of ferrite clamp on answers, that'll help, and even some at Rad Shak.

marv

:Hello I have 2 computers now. A long time ago I was posting on here how one of my radios had this hissing/whistling noise, and anyway it wasnt the radio at all but the computer that was making it. Well now the original compter has a much more quality supply in it to run the gaming video card. Would you believe the interference is now gone! I paid 179 for the supply. Question is the second computer inhereted the same power supply and guess what, ...boat loads of RFI. I really dont want to spend that much money for another supply, but if any of you should happen to know what to look for in a power supply or where to get one that isnt able to contact aliens with RFI, I would greatly appreciate it.

:Sean,
:Use a battery set to determine if it is radiated or induced energy into the power circuit, then go from there. There are lots of ferrite clamp on answers, that'll help, and even some at Rad Shak.
:
:marv
:
::Hello I have 2 computers now. A long time ago I was posting on here how one of my radios had this hissing/whistling noise, and anyway it wasnt the radio at all but the computer that was making it. Well now the original compter has a much more quality supply in it to run the gaming video card. Would you believe the interference is now gone! I paid 179 for the supply. Question is the second computer inhereted the same power supply and guess what, ...boat loads of RFI. I really dont want to spend that much money for another supply, but if any of you should happen to know what to look for in a power supply or where to get one that isnt able to contact aliens with RFI, I would greatly appreciate it.

Replace the power supply. You do not have to spend over a hundred dollars to get a quality power supply.
Here is one . Antec makes quality low cost supplies.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371005

:Hello, last night I decided to replace the 430watt power supply on this msi board with a 4800 dual core, with the 580 watt one I originally had for the home built computer, ...and guess what, the noise is a lot less, but still irritating to me. Its funny because the wife is using my computer to play games on it, that arent on this computer. Im trying to get her radio working while posting on here, and this computer is screwing it up worse, lmao. Btw I paid 16 bucks plus shipping for the echostar power supply thats currently running it now. The 430 watt one is called "@-power". The rest of the label says atx switching power supply model ep-43057.
So now its on to looking at those links posted.
All I want is a ps with NOOOOOOOOO RFI. IF I have to get the same one thats in the other computer then so be it.....no rfi there, but that ps is made for video cards that have over 30 amps of 12 volts.
::Sean,
::Use a battery set to determine if it is radiated or induced energy into the power circuit, then go from there. There are lots of ferrite clamp on answers, that'll help, and even some at Rad Shak.
::
::marv
::
:::Hello I have 2 computers now. A long time ago I was posting on here how one of my radios had this hissing/whistling noise, and anyway it wasnt the radio at all but the computer that was making it. Well now the original compter has a much more quality supply in it to run the gaming video card. Would you believe the interference is now gone! I paid 179 for the supply. Question is the second computer inhereted the same power supply and guess what, ...boat loads of RFI. I really dont want to spend that much money for another supply, but if any of you should happen to know what to look for in a power supply or where to get one that isnt able to contact aliens with RFI, I would greatly appreciate it.
:
:Replace the power supply. You do not have to spend over a hundred dollars to get a quality power supply.
:Here is one . Antec makes quality low cost supplies.
:http://www.newegg.com/Product/Product.aspx?Item=N82E16817371005

:Ok the power supply is ordered, so when it comes,I wont be able to talk to the aliens on melmar 3
::Hello, last night I decided to replace the 430watt power supply on this msi board with a 4800 dual core, with the 580 watt one I originally had for the home built computer, ...and guess what, the noise is a lot less, but still irritating to me. Its funny because the wife is using my computer to play games on it, that arent on this computer. Im trying to get her radio working while posting on here, and this computer is screwing it up worse, lmao. Btw I paid 16 bucks plus shipping for the echostar power supply thats currently running it now. The 430 watt one is called "@-power". The rest of the label says atx switching power supply model ep-43057.
:So now its on to looking at those links posted.
:All I want is a ps with NOOOOOOOOO RFI. IF I have to get the same one thats in the other computer then so be it.....no rfi there, but that ps is made for video cards that have over 30 amps of 12 volts.
:::Sean,
:::Use a battery set to determine if it is radiated or induced energy into the power circuit, then go from there. There are lots of ferrite clamp on answers, that'll help, and even some at Rad Shak.
:::
:::marv
:::
::::Hello I have 2 computers now. A long time ago I was posting on here how one of my radios had this hissing/whistling noise, and anyway it wasnt the radio at all but the computer that was making it. Well now the original compter has a much more quality supply in it to run the gaming video card. Would you believe the interference is now gone! I paid 179 for the supply. Question is the second computer inhereted the same power supply and guess what, ...boat loads of RFI. I really dont want to spend that much money for another supply, but if any of you should happen to know what to look for in a power supply or where to get one that isnt able to contact aliens with RFI, I would greatly appreciate it.
::
::Replace the power supply. You do not have to spend over a hundred dollars to get a quality power supply.
::Here is one . Antec makes quality low cost supplies.
::http://www.newegg.com/Product/Product.aspx?Item=N82E16817371005

I gotta ask, for as dumb as it sounds (no pun intended), did anyone consider just moving the radio or computer to another location?. Thats what I did.

:Um, lmao, yep. Both of these computers are downstairs. This computer I am on tonight has the good power supply with absolutely no audible interference on the radios I play. So, anyway later on 1 night ago, we retired upstairs and tuned in shortwave. Sure enough, with both computers off. I could still hear that annoying whistling/whirring/wind sound. I went down stairs and UNPLUGGED the cheap powersupply on her computer from the wall outlet. Much to my suprise the sound now totally dissapeared.
Sooooo word to the wise, if you love listening to these old radios(or new am radios for that matter), and having your commputer on at the same time, dont buy 16 bucker powersupplys.
:I gotta ask, for as dumb as it sounds (no pun intended), did anyone consider just moving the radio or computer to another location?. Thats what I did.

good power supply with absolutely no audible interference on the radios I play. So, anyway later on 1 night ago, we retired upstairs and tuned in shortwave. Sure enough, with both computers off. I could still hear that annoying whistling/whirring/wind sound. I went down stairs and UNPLUGGED the cheap powersupply on her computer from the wall outlet. Much to my suprise the sound now totally dissapeared.
:I had noise on our a m radios and discovered it was a dvd player. Now keep the dvd player unplugged when not using it. From Stuart

Even though the power supply was working well enough for the PC to function, the power supply could still have a problem causing the noise. If you attempt to open one of these up, be careful.

Depending on the problem, there could be 300VDC hanging on after the power is turned off.

:good power supply with absolutely no audible interference on the radios I play. So, anyway later on 1 night ago, we retired upstairs and tuned in shortwave. Sure enough, with both computers off. I could still hear that annoying whistling/whirring/wind sound. I went down stairs and UNPLUGGED the cheap powersupply on her computer from the wall outlet. Much to my suprise the sound now totally dissapeared.
::I had noise on our a m radios and discovered it was a dvd player. Now keep the dvd player unplugged when not using it. From Stuart

A couple of years ago I bought some X10 modules and a timer to automate the holiday lighting inside and out and had some erratic operation with them. Basically what the problem turned out to be was one of the kids Nintendo 64 units and a PC in the basement. Since the X10 signal rides on the AC line either the power supplies in the Nintendo and PC were attenuating the signal burst as noise, or were putting noise of their own back on the line. Bought a few line filters recommended by Smarthome for those two devices and the problem went away. If the problem is truly RFI with the radios, I doubt these filters would help, but if somehow they were putting hash back on to the line I wonder if that could be a problem?

:Even though the power supply was working well enough for the PC to function, the power supply could still have a problem causing the noise. If you attempt to open one of these up, be careful.
:
:Depending on the problem, there could be 300VDC hanging on after the power is turned off.
:
::good power supply with absolutely no audible interference on the radios I play. So, anyway later on 1 night ago, we retired upstairs and tuned in shortwave. Sure enough, with both computers off. I could still hear that annoying whistling/whirring/wind sound. I went down stairs and UNPLUGGED the cheap powersupply on her computer from the wall outlet. Much to my suprise the sound now totally dissapeared.
:::I had noise on our a m radios and discovered it was a dvd player. Now keep the dvd player unplugged when not using it. From Stuart