RE: [Elecraft] Interference from Computers-Routers
Paul, I wonder what model/type of computer & monitor you are using? Jim - N4ST -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gates Sent: Wednesday, August 10, 2005 18:25 To: John [K7SVV]; elecraft Subject: Re: [Elecraft] Interference from Computers-Routers This is all interesting about the interference. I have my computer about 3 inches from my station and have never had any noise or interference from it. I have the same router that you mention and not one peep of noise from it. Am I just lucky? Paul Paul Gates K1 #0231 KX1 #1186 XG1 [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] Interference from Computers-Routers
Hi Tom, Each ground wire has different losses, and picks up different noise, so in fact, while they are the same on a gross level, on a fine level, they are different. The closer together they're tied, the more they'll be the same. If the intent is to minimize differences, get them very close together. If the intent is to isolate noise from the other, the further away the interconnection point is, the better. We used to install isolated ground systems for HP computers back in the old days, since they were very sensitive to noise coming in the power line. 73, doug Date: Thu, 11 Aug 2005 08:01:00 -0400 From: "tom.w3qs" <[EMAIL PROTECTED]> Thread-index: AcWeDCu0x19GI2pERq+NLxNnUJYg5QAXmtUw Hi Stuart, I have heard this so many times I think it has become 'general knowledge', but I don't get it. Say you have two power strips plugged into the same wall outlet. Surely the ground leads of both are then physically connected inside that wall outlet. Aren't the ground leads of both then physically connected? For that matter, all grounding leads are ultimately connected to the same physical terminal on the house's power panel. Again, I know there is 'conventional wisdom' that talks of 'two' 120 loops in a 240 house, but still the ground leads are all connected - at least they are at my house. What am I missing? Tom -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Part of good grounding, is to run a computer used with a radio from the same power strip. IF the computer is NOT used with radio, have it separated or on different power circuit. Stuart K5KVH ___ Elecraft mailing list Post to: Elecraft@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@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
RE: [Elecraft] Interference from Computers-Routers
Hi Stuart, I have heard this so many times I think it has become 'general knowledge', but I don't get it. Say you have two power strips plugged into the same wall outlet. Surely the ground leads of both are then physically connected inside that wall outlet. Aren't the ground leads of both then physically connected? For that matter, all grounding leads are ultimately connected to the same physical terminal on the house's power panel. Again, I know there is 'conventional wisdom' that talks of 'two' 120 loops in a 240 house, but still the ground leads are all connected - at least they are at my house. What am I missing? Tom -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Part of good grounding, is to run a computer used with a radio from the same power strip. IF the computer is NOT used with radio, have it separated or on different power circuit. Stuart K5KVH ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] Interference from Computers-Routers
Paul, KD3JF wrote: "I have my computer about 3 inches from my station and have never had any noise or interference from it. I have the same router that you mention and not one peep of noise from it. Am I just lucky?" == My guess is that your antenna is coax-fed and is more than just a few feet from your computer. We must keep in mind that the RFI generated by the switching power supplies in a computer system enters the ham receiver via the receiver's antenna input. Those using well-matched coax-fed antennas are probably bothered very little by this type of RFI. But those whose antennas come into an antenna tuner located in the shack are probably more cognizant of the problem. 73, de Earl, K6SE ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] Interference from Computers-Routers
Maybe Paul, you have a better grounding scheme. Part of good grounding, is to run a computer used with a radio from the same power strip. IF the computer is NOT used with radio, have it separated or on different power circuit. Stuart K5KVH ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] Interference from Computers-Routers
This is all interesting about the interference. I have my computer about 3 inches from my station and have never had any noise or interference from it. I have the same router that you mention and not one peep of noise from it. Am I just lucky? Paul Paul Gates K1 #0231 KX1 #1186 XG1 [EMAIL PROTECTED] - Original Message - From: "John [K7SVV]" <[EMAIL PROTECTED]> To: "ROBERT CARROLL" <[EMAIL PROTECTED]> Cc: "Elecraft Reflector" Sent: Wednesday, August 10, 2005 3:11 PM Subject: Re: [Elecraft] Interference from Computers-Routers 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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> > To: "'Elecraft Reflector'" > 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@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@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@mailman.qth.net > You must be a subsc
Re: [Elecraft] Interference from Computers-Routers
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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> > To: "'Elecraft Reflector'" > 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@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@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@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 > -- John [K7SVV] ___ Elecraft mailing list Post to: Elecraft@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
RE: [Elecraft] Interference from Computers-Routers
>> 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. FWIW I found that using shielded twisted pair (STP) ethernet cables rather than the more common unshielded twisted pair (UTP) helps. STP cables have a foil shield over the pairs of cable which is grounded to the equipment chassis by a metal outer on the RJ45 connector. It's still worth putting a ferrite on each end of the cable. I've got a Draytek broadband router that puts out loads of QRM right over the HF bands and beyond 2m. When I had a look inside I found it's got a PCB containing a switching regulator, a fast CPU and the line transceiver for the ADSL. This just sits inside a plastic box with no attempt at screening whatsoever. I think the fix is going to be to put the whole lot into a larger metal box and filter the connections in and out. Needless to say, a product to avoid if you value a quiet electrical environment! Putting a wireless LAN router in a metal box probably defeats the object of having it, unless you can wire the antenna to an SMA connector on the outer box, I suppose. Finally another source of noise I find is video cables connecting cable / satellite set top boxes to TVs. Here you get a signal with strong 50 / 100 Hz components (OK. 60/120Hz for most of you I guess!) that varies in amplitude with the brightness of the picture. Hi to all (first post here). K2 kit on order... Kevin G7BCS ___ Elecraft mailing list Post to: Elecraft@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
RE: RE: [Elecraft] Interference from Computers-Routers
The Linksys devices have the switching in the wart, not the box. You can put it on a 6-v dry cell for testing. (Check, some Linksys are 12v, most are 5). Dan / WG4S / K2 #2456 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. ___ Elecraft mailing list Post to: Elecraft@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
RE: [Elecraft] Interference from Computers-Routers
Hi, Ron- The "smart home" system was pretty elderly, having been installed about 1983, two owners back. The house has an alarm system, and when a sensor detected an intruder, it generated a coded output signal which went to the box hidden behind the breaker panel. The box in their generated a 2 part code that was put on a house wiring carrier signal and injected at the panel. The signal went throughout the house on the ac wiring and when it reached a "smart switch" with the right unit code and house code (maybe they were worried about doing things by mistake in the house next door) the switch would turn on a light in the vicinity of the suspected intrusion. Actually several signals would be sent so that several lights would be turned on. There were little bar slides on most of these switches allowing you to turn off the remote feature if you wanted. We also discovered a little remote control allowing you to turn on things remotely if you wanted. Some of the smart switches included a dimmer which could be operated by the remote control. It was the dimmer capability that caused me to send several things to the dump. The dimmers were designed for incandescent lights only drawing 500w or less, but the original electrician had wired them to the upper socket in many ac outlets. I guess the idea was to going into a room, hit the wall switch and use the dimmer to control table lamps plugged into the upper outlets. But the dimmer was never designed to handle fluorescents or switching power supplies, and I destroyed several things before finding I wanted to dump the "smart" system. Bob W2WG -Original Message- From: ron [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 10, 2005 10:31 AM To: ROBERT CARROLL Cc: 'Elecraft Reflector' Subject: Re: [Elecraft] Interference from Computers-Routers Wow, good work Bob. Thank you for sharing it with us. I made my wife throw out all (2) the touch lamps and removed all "dimmer" switches. (It makes the radio "dim") but never thought about the router causing birdies that I do have (always on your favorite freqs). Can you explain what the signal injector behind the panel was for? Ron wb1hga (still not entirely noise free, yet) ROBERT CARROLL 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> > To: "'Elecraft Reflector'" > 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 t
Re: RE: [Elecraft] Interference from Computers-Routers
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 <[EMAIL PROTECTED]> >Date: Wed Aug 10 09:17:15 CDT 2005 >To: 'Elecraft Reflector' >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: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> >To: "'Elecraft Reflector'" >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@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@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@mailman.qth.net >You must be a subscriber to post to the list. >Subscriber Info (Addr. Chan
Re: [Elecraft] Interference from Computers-Routers
Wow, good work Bob. Thank you for sharing it with us. I made my wife throw out all (2) the touch lamps and removed all "dimmer" switches. (It makes the radio "dim") but never thought about the router causing birdies that I do have (always on your favorite freqs). Can you explain what the signal injector behind the panel was for? Ron wb1hga (still not entirely noise free, yet) ROBERT CARROLL 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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> To: "'Elecraft Reflector'" 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@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@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@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@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
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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> To: "'Elecraft Reflector'" 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@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@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@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
