[Elecraft] Interference from Computers-Routers

[John [K7SVV]]

Robert,
     Like you, most of my interference comes from a LINKSYS WRT54G.I
have tried unsuccessfully to use ferrite cores on both ends of the
power cord.  The birdie that hurts me the most is at 14.333 MHz.  I
have been thinking about switching to a D-LINK router because I have
heard that it is much quieter.

John   [K7SVV] 

On 8/10/05, ROBERT CARROLL <w2wg at comcast.net> wrote:
> 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
> >
> >
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-- 
John   [K7SVV]