[Elecraft] Interference from Computers-Routers
vze3v8dt at verizon.net
vze3v8dt at verizon.net
Wed Aug 10 10:41:44 EDT 2005
Possibly the best clue you gave was the ferrites that you added to the wall wart for the Linksys wireless G router, and the 30 kHz spacing on the spurs. This sounds to me like the wall wart may be a switching supply. Maybe if you got a linear regulated supply for the router to replace the wall wart the spurs would go away. That is assumming they are coming from the wall wart if the switching supply is built into it, as compared to if the switching part is in the router itself.
Thanks for the "heads up" on the Linksys router. I was about to get a wireless network going myself to get a link out to the garage for a remote radio beacon (PropNetPSK31 on 10m) project I'm working on. Maybe I'll start with a D-link wireless G router instead.
73,
Mark, NK8Q
K2 4786
>From: ROBERT CARROLL <w2wg at comcast.net>
>Date: Wed Aug 10 09:17:15 CDT 2005
>To: 'Elecraft Reflector' <elecraft at mailman.qth.net>
>Subject: RE: [Elecraft] Interference from Computers-Routers
>I have recently moved to a new QTH and am slowly getting things in shape to
>get back on the air. I ran into a lot of nasty RFI problems. The previous
>owner had installed "smart house" wall switches throughout the house. They
>were supposed to control incandescent lamps only, but in fact they
>controlled fans, wall outlets, etc. Besides sending a few entertainment
>radios to the dump before I figured out what was going on, the RFI was
>horrendous. Gradually I removed them only to find I still had problems.
>While doing some electrical work an electrician found the signal injector
>for the system behind the main breaker panel, and that eliminated nearly all
>the noise.
>
>I should say nearly all the broadband noise, as I was left with birdies
>about every 30 kHz or so. Eventually I tracked those down to a Linksys
>Wireless G router, model wrt54gs. My previous Linksys bit the dust just
>before I moved, so I can't say if I would have heard the birdies from this
>one had I installed it in the old QTH. I have wireless and wired
>connections running off this router, and have helped the problem by
>installing ferrite on the power wart lead and all the data leads. But I
>have not been able to eliminate the rather broad birdies that seem to fall
>at nice dx frequencies.
>
>Has anyone on the reflector had such a problem and found a way to cure it?
>Searching on the internet I find that RFI from routers is a well known
>phenomenon, but I have seen no suggestions for curing the problem.
>
>
>Bob W2WG
>
>
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net
>[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bob - W5BIG
>Sent: Wednesday, August 10, 2005 9:32 AM
>To: tom.w3qs; 'Elecraft Reflector'
>Subject: Re: [Elecraft] Interference from Computers
>
>Hi Tom,
>
>One major source of noise is the CRT monitor. It helps to make the screen
>display as uniform as possible, like a blank window or a plain background
>without texture.
>
>73/ Bob - W5BIG
>
>
>----- Original Message -----
>From: "tom.w3qs" <tom.w3qs at verizon.net>
>To: "'Elecraft Reflector'" <elecraft at mailman.qth.net>
>Sent: Wednesday, August 10, 2005 7:03 AM
>Subject: [Elecraft] Interference from Computers
>
>
>> Good Morning Group,
>>
>> I am back on the air (4991) after nearly 20 years. The first thing I
>> noticed was all the interference on 20 meters. Hetrodynes everywhere!
>> What's going on?
>>
>> Took me a while to figure out that it was the computer - not there 20
>years
>> ago!
>>
>> So, other than removing it from the shack (ghastly thought) is there any
>> font of wisdom on this subject or general guidance?
>>
>> Thanks and 73,
>>
>> Tom, W3QS
>>
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: Elecraft at mailman.qth.net
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>>
>
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft at mailman.qth.net
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com
>
>
>_______________________________________________
>Elecraft mailing list
>Post to: Elecraft at mailman.qth.net
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com
More information about the Elecraft
mailing list