RFI from computer

[Barry]

Was playing in the 10m contest this weekend and had noise (like a dirty,
hashy carrier, similar to TV-generated noise) every 5-10 kHz as I tuned
the band.  When I turned my laptop off, it went away.

My laptop is about 4 ft from the radio and about 25 ft from my balcony
dipole.  Any thoughts on how to decrease the noise?
Tnx,
Barry W2UP

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[Jeff Cochrane - VK4XA]

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[MontyS]

Barry -
The interference may be coming from the LCD.  Can you reduce the brightness of the display?
Also check the power supply - try putting beads on the leads.  It could be a noisy switching supply.

If, as Jeff suggested, it's Ethernet noise, you could use a USB wireless adapter if the laptop does not already have a wireless network feature.
Monty K2DLJ

On Dec 12, 2010, at 10:38 AM, Barry wrote:

> Was playing in the 10m contest this weekend and had noise (like a dirty,
> hashy carrier, similar to TV-generated noise) every 5-10 kHz as I tuned
> the band.  When I turned my laptop off, it went away.
>
> My laptop is about 4 ft from the radio and about 25 ft from my balcony
> dipole.  Any thoughts on how to decrease the noise?
> Tnx,
> Barry W2UP

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[Barry]

Thanks for comments so far.  Running wireless for internet connection (and yes, needs to be connected).  Unplugged PS and no change while on battery.  Using an external monitor, with laptop monitor off.  Turning off external monitor makes no difference.
Barry W2UP

[Tony Estep]

On Sun, Dec 12, 2010 at 10:06 AM, Barry <[hidden email]> wrote:

>
> Thanks for comments so far.  Running wireless for internet connection (and
> yes, needs to be connected)....


Barry, what Jeff means is to go to the device manager in your Windows, find
the internal Ethernet adaptor, and set it to "disable." In my case it didn't
do much, but it's worth a try.
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[N3XX]

I would try temporarily powering down your router, cable modem, or whatever
equipment is used for the internet connection to be sure it's not actually
that equipment causing the problem.
Also, even though you powered down the external monitor, I would also try
disconnecting that cable from your computer to be sure it's not radiating
any rf.

GL - 73,
Tim - N3XX

----- Original Message -----
From: "Barry" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, December 12, 2010 11:06 AM
Subject: Re: [Elecraft] RFI from computer

>
> Thanks for comments so far.  Running wireless for internet connection (and
> yes, needs to be connected).  Unplugged PS and no change while on battery.
> Using an external monitor, with laptop monitor off.  Turning off external
> monitor makes no difference.
> Barry W2UP
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/RFI-from-computer-tp5828305p5828355.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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[Larry - K2GN]

Barry;

I have an LCD monitor.

Every now and then I get RFI from it.

I disconnect it from the power supply for a few seconds, plug it back in and
RFI is gone.

It may come back in a couple of days or it can be weeks.

de  <mailto:[hidden email]> K2GN - Larry -  <http://k2gn.com/>
http://k2gn.com

K3 S/N - 3278    P3 S/N - 51

From: [hidden email]
[mailto:[hidden email]] On Behalf Of Monty Shultes
Sent: Sunday, December 12, 2010 10:57 AM
To: Barry; [hidden email]
Subject: Re: [Elecraft] RFI from computer

 

Barry -
The interference may be coming from the LCD.  Can you reduce the brightness
of the display?
Also check the power supply - try putting beads on the leads.  It could be a
noisy switching supply.

If, as Jeff suggested, it's Ethernet noise, you could use a USB wireless
adapter if the laptop does not already have a wireless network feature.
Monty K2DLJ

On Dec 12, 2010, at 10:38 AM, Barry wrote:

> Was playing in the 10m contest this weekend and had noise (like a dirty,
> hashy carrier, similar to TV-generated noise) every 5-10 kHz as I tuned
> the band.  When I turned my laptop off, it went away.
>
> My laptop is about 4 ft from the radio and about 25 ft from my balcony
> dipole.  Any thoughts on how to decrease the noise?
> Tnx,
> Barry W2UP

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  _____  

No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1170 / Virus Database: 426/3311 - Release Date: 12/12/10

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[alsopb]

Any USB/serial dongles connected.  There were some postings previously
on these beasties sometimes causing noise.

73 de Brian/K3KO

On 12/12/2010 15:38, Barry wrote:

> Was playing in the 10m contest this weekend and had noise (like a dirty,
> hashy carrier, similar to TV-generated noise) every 5-10 kHz as I tuned
> the band.  When I turned my laptop off, it went away.
>
> My laptop is about 4 ft from the radio and about 25 ft from my balcony
> dipole.  Any thoughts on how to decrease the noise?
> Tnx,
> Barry W2UP
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1170 / Virus Database: 426/3311 - Release Date: 12/12/10
>
>

-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1170 / Virus Database: 426/3311 - Release Date: 12/12/10

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[vk4tux]

On 12/13/2010 03:00 AM, [hidden email] wrote:

> Subject: [Elecraft] RFI from computer
> To:[hidden email]
> Message-ID:<[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Was playing in the 10m contest this weekend and had noise (like a dirty,
> hashy carrier, similar to TV-generated noise) every 5-10 kHz as I tuned
> the band.  When I turned my laptop off, it went away.
>
> My laptop is about 4 ft from the radio and about 25 ft from my balcony
> dipole.  Any thoughts on how to decrease the noise?
> Tnx,
> Barry W2UP

I use one of these, works great;

http://www.coilcraft.com/rs232.cfm#table

Adrian ... vk4tux

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