Re: [Elecraft] RFI issues
On 2/22/2020 11:59 AM, Lyn Norstad wrote: Approximately 10 mi SW of us is a different sort of problem. A commercial shortwave station has been built and is operating on an experimental basis. Their plan is to transmit market data over the pole to High Speed Traders in Europe (milliseconds faster than cable). They are currently licensed on frequencies on both sides of our 40 meter band, and between our 30 and 20 meter bands. They are using a 25 KW transmitter into an 18 db gain curtain, with an EIRP of 808 KW. This is a great example a situation that demands a rig as good as a K3S! And probably the highest cost version of a K4. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Thanks for that, Jim. We are actually 38 miles due West of the Willis (Sears) tower in Central Kane County. There is virtually no industrial noise source nearby, but we do occasionally get interference from medical apparatus. With my 360 ft. EDZ (cut for 3.5 MHz) strung E-W at about 30 feet, I normally have a background noise level in the S1 - S2 level, depending on band and time of day. I have a backup antenna in the attic (modified G5RV) that does not fare quite as well, but is still useable. Approximately 10 mi SW of us is a different sort of problem. A commercial shortwave station has been built and is operating on an experimental basis. Their plan is to transmit market data over the pole to High Speed Traders in Europe (milliseconds faster than cable). They are currently licensed on frequencies on both sides of our 40 meter band, and between our 30 and 20 meter bands. They are using a 25 KW transmitter into an 18 db gain curtain, with an EIRP of 808 KW. We are located on the edge of their 38º beamwidth. To date I have only seen them in the region just below 40 meters. To say they are noticeable would be an understatement. There are quite a number of similar stations across the country, so I'm sure others in the group have encountered them as well. 73 Lyn, WØLEN -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, February 22, 2020 12:45 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] RFI issues On 2/21/2020 6:12 PM, Lyn Norstad wrote: > In Chicagoland, all wiring must be in conduits, and both the > kitchen and the shack are on their own circuits. In fact, the only 'home > grown' RFI I am aware of is 1 out of 4 identical HP 24" LED monitors that > puts out a steady carrier on 30 meters. Having lived in Chicago for 42 years and maintained an engineering consulting practice there for 30 years, and as a former member of IBEW 134, I'm well aware of the conduit requirement. :) Indeed, I had a lot of conduit installed in the 2-flat I bought on the North Side in 1986. Which is also why I added the phrase "the nature of electrical wiring in your home also matters." The large sound systems I designed and specified used miles of conduit for both power and signal wiring. When I moved to W6 in 2006, I had the outbuilding that would become my shack and consulting office wired with EMT before I moved in. Several other points here. First, RFI is generally NOT conducted on wiring from one piece of equipment to another, it is radiated by wiring from one piece of equipment to another. And it is often present on, and radiated by, the equipment ground conductor (the green wire). Properly installed conduit (continuous and bonded at every junction and at both ends) provides shielding, and prevents radiation. Second, when I operated in Chicago, my noise level was fairly high, with contributions from my own home, my tenant who lived below me, the homes that surrounded mine, Newark's corporate office building at the end of my block, whatever was on power lines, and trains on the Northwestern track across the street. With that noise level, usually in the range of S6 to S8, it would be pretty hard to notice yet another noise source 50 ft from my antennas. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to l...@lnainc.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/21/2020 6:12 PM, Lyn Norstad wrote: In Chicagoland, all wiring must be in conduits, and both the kitchen and the shack are on their own circuits. In fact, the only 'home grown' RFI I am aware of is 1 out of 4 identical HP 24" LED monitors that puts out a steady carrier on 30 meters. Having lived in Chicago for 42 years and maintained an engineering consulting practice there for 30 years, and as a former member of IBEW 134, I'm well aware of the conduit requirement. :) Indeed, I had a lot of conduit installed in the 2-flat I bought on the North Side in 1986. Which is also why I added the phrase "the nature of electrical wiring in your home also matters." The large sound systems I designed and specified used miles of conduit for both power and signal wiring. When I moved to W6 in 2006, I had the outbuilding that would become my shack and consulting office wired with EMT before I moved in. Several other points here. First, RFI is generally NOT conducted on wiring from one piece of equipment to another, it is radiated by wiring from one piece of equipment to another. And it is often present on, and radiated by, the equipment ground conductor (the green wire). Properly installed conduit (continuous and bonded at every junction and at both ends) provides shielding, and prevents radiation. Second, when I operated in Chicago, my noise level was fairly high, with contributions from my own home, my tenant who lived below me, the homes that surrounded mine, Newark's corporate office building at the end of my block, whatever was on power lines, and trains on the Northwestern track across the street. With that noise level, usually in the range of S6 to S8, it would be pretty hard to notice yet another noise source 50 ft from my antennas. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
There's a paragraph of slightly raised writing on the bottom...really hard to read, but if I get a chance to turn it over again, I'll check. It's set up for morning right now. Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Feb 21, 2020, at 8:06 PM, Bob McGraw K4TAX wrote: > > Seems like a good reason not to buy one. Which reminds me, do they have a > Part 15 label attached? Not that they actually meet Part 15 requirements. > > 73 > Bob, K4TAX > > > Sent from my iPhone > >> On Feb 21, 2020, at 8:02 PM, hawley, charles j jr >> wrote: >> >> Keurig Pro Duo 5200 (they leak stuff out when you turn them upside down...) >> >> Jack BMW Motorcycles >> Chuck KE9UW >> c-haw...@illinois.edu >> >> Sent from my iPad >> >>>> On Feb 21, 2020, at 7:20 PM, Gary K9GS wrote: >>> >>> What's the MODEL number??73,Gary K9GS >>> Original message From: "hawley, charles j jr" >>> Date: 2/21/20 5:08 PM (GMT-06:00) To: >>> l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH >>> Subject: Re: [Elecraft] RFI issues This is the newest one that brews a >>> carafe of 10 cups or does a pod into your mug. I too have had others >>> without any noise, but this new one puts a huge sine wave of noise on the >>> panadapter. I have put ferrite on the line cord which don't affect it. I >>> just turn the thing off after brewing...or wait about 5 minutes and the >>> noise goes away. Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent >>> from my iPad> On Feb 21, 2020, at 11:42 AM, Lyn Norstad >>> wrote:> > I've had several of the inexpensive Keurig Pod type, and have >>> never had an issue on any band.> > Kitchen is right next door to the shack, >>> and the pot is on all day.> > Lyn> W0LEN> > > -Original Message-> >>> From: elecraft-boun...@mailman.qth.net >>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j >>> jr> Sent: Thursday, February 20, 2020 2:04 PM> To: W8JH> Cc: >>> elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > I still >>> love the coffee maker and would buy it again. I just turn it off after the >>> pot or pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my iPhone, >>> cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH >>> wrote:>> >> ke9uw wrote>>> We bought a new Keurig coffee maker which does >>> a pot or also the pods. It>>> puts a huge noise out to the ham frequencies. >>> Have to turn it off to get>>> on 80M>> >> That is a serious conflict!>> >> >>> 80m morning greyline without caffeine, people cannot live this way!!>> >> >>> >> >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 >>> happy user.>> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> >>> __>> Elecraft >>> mailing list>> Home: http://mailman.qth.net/mailman/listinfo/elecraft>> >>> Help: http://mailman.qth.net/mmfaq.htm>> Post: >>> mailto:Elecraft@mailman.qth.net>> >> This list hosted by: >>> http://www.qsl.net>> Please help support this email list: >>> http://www.qsl.net/donate.html>> Message delivered to c-haw...@illinois.edu >>> > __> Elecraft >>> mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: >>> http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net> > >>> This list hosted by: http://www.qsl.net> Please help support this email >>> list: http://www.qsl.net/donate.html> Message delivered to l...@lnainc.com >>> > __Elecraft >>> mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: >>> http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis >>> list hosted by: http://www.qsl.netPlease help support this email list: >>> http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfa
Re: [Elecraft] RFI issues
Can we end this thread now please ? > On Feb 21, 2020, at 5:21 PM, Gary K9GS wrote: > > What's the MODEL number??73,Gary K9GS > Original message From: "hawley, charles j jr" > Date: 2/21/20 5:08 PM (GMT-06:00) To: > l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH > Subject: Re: [Elecraft] RFI issues This is the newest one that brews a carafe > of 10 cups or does a pod into your mug. I too have had others without any > noise, but this new one puts a huge sine wave of noise on the panadapter. I > have put ferrite on the line cord which don't affect it. I just turn the > thing off after brewing...or wait about 5 minutes and the noise goes away. > Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent from my iPad> On Feb > 21, 2020, at 11:42 AM, Lyn Norstad wrote:> > I've had > several of the inexpensive Keurig Pod type, and have never had an issue on > any band.> > Kitchen is right next door to the shack, and the pot is on all > day.> > Lyn> W0LEN> > > -Original Message-> From: > elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On > Behalf Of hawley, charles j jr> Sent: Thursday, February 20, 2020 2:04 PM> > To: W8JH> Cc: elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > > I still love the coffee maker and would buy it again. I just turn it off > after the pot or pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my > iPhone, cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH > wrote:>> >> ke9uw wrote>>> We bought a new Keurig coffee maker which does a > pot or also the pods. It>>> puts a huge noise out to the ham frequencies. > Have to turn it off to get>>> on 80M>> >> That is a serious conflict!>> >> > 80m morning greyline without caffeine, people cannot live this way!!>> >> >> > >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 happy > user.>> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> > __>> Elecraft > mailing list>> Home: http://mailman.qth.net/mailman/listinfo/elecraft>> Help: > http://mailman.qth.net/mmfaq.htm>> Post: mailto:Elecraft@mailman.qth.net>> >> > This list hosted by: http://www.qsl.net>> Please help support this email > list: http://www.qsl.net/donate.html>> Message delivered to > c-haw...@illinois.edu > > __> Elecraft > mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: > http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net> > > This list hosted by: http://www.qsl.net> Please help support this email list: > http://www.qsl.net/donate.html> Message delivered to l...@lnainc.com > > __Elecraft > mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: > http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis > list hosted by: http://www.qsl.netPlease help support this email list: > http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to andy.moorw...@moorcom.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Well, Jim - If you're going to quote someone, bear in mind that editing what they said out of context might change the meaning of what they said (you've probably heard of the C.O.M.A. process used in Bible study). I said two things: 1) I've had several of the inexpensive Keurig Pod type, and have never had an issue on any band. and ... 2) Kitchen is right next door to the shack, and the pot is on all day. #1 is a response to the RFI issue, but ... #2 is an indicator that I need to have coffee nearby both for myself and for others who may be visiting my shack. Stop over the next time you're in Chicago. 73 Lyn, W0LEN PS - FWIW, the nearest point of the antenna is probably 50 feet from the coffee pot. In Chicagoland, all wiring must be in conduits, and both the kitchen and the shack are on their own circuits. In fact, the only 'home grown' RFI I am aware of is 1 out of 4 identical HP 24" LED monitors that puts out a steady carrier on 30 meters. -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Friday, February 21, 2020 1:20 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] RFI issues On 2/21/2020 9:41 AM, Lyn Norstad wrote: > Kitchen is right next door to the shack, and the pot is on all day. What matters is distance to antennas, not the shack. The nature of electrical wiring in your home also matters, because it's that wiring that radiates any noise produced. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to l...@lnainc.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Seems like a good reason not to buy one. Which reminds me, do they have a Part 15 label attached? Not that they actually meet Part 15 requirements. 73 Bob, K4TAX Sent from my iPhone > On Feb 21, 2020, at 8:02 PM, hawley, charles j jr > wrote: > > Keurig Pro Duo 5200 (they leak stuff out when you turn them upside down...) > > Jack BMW Motorcycles > Chuck KE9UW > c-haw...@illinois.edu > > Sent from my iPad > >> On Feb 21, 2020, at 7:20 PM, Gary K9GS wrote: >> >> What's the MODEL number??73,Gary K9GS >> Original message From: "hawley, charles j jr" >> Date: 2/21/20 5:08 PM (GMT-06:00) To: >> l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH >> Subject: Re: [Elecraft] RFI issues This is the newest one that brews a >> carafe of 10 cups or does a pod into your mug. I too have had others without >> any noise, but this new one puts a huge sine wave of noise on the >> panadapter. I have put ferrite on the line cord which don't affect it. I >> just turn the thing off after brewing...or wait about 5 minutes and the >> noise goes away. Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent >> from my iPad> On Feb 21, 2020, at 11:42 AM, Lyn Norstad >> wrote:> > I've had several of the inexpensive Keurig Pod type, and have >> never had an issue on any band.> > Kitchen is right next door to the shack, >> and the pot is on all day.> > Lyn> W0LEN> > > -Original Message-> >> From: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr> >> Sent: Thursday, February 20, 2020 2:04 PM> To: W8JH> Cc: >> elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > I still love >> the coffee maker and would buy it again. I just turn it off after the pot or >> pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my iPhone, cjack > >> >> On Feb 20, 2020, at 12:12 PM, W8JH wrote:>> >> >> ke9uw wrote>>> We bought a new Keurig coffee maker which does a pot or also >> the pods. It>>> puts a huge noise out to the ham frequencies. Have to turn >> it off to get>>> on 80M>> >> That is a serious conflict!>> >> 80m morning >> greyline without caffeine, people cannot live this way!!>> >> >> >> >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 happy user.>> >> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> >> __>> Elecraft >> mailing list>> Home: http://mailman.qth.net/mailman/listinfo/elecraft>> >> Help: http://mailman.qth.net/mmfaq.htm>> Post: >> mailto:Elecraft@mailman.qth.net>> >> This list hosted by: >> http://www.qsl.net>> Please help support this email list: >> http://www.qsl.net/donate.html>> Message delivered to c-haw...@illinois.edu >> > __> Elecraft >> mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: >> http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net> > >> This list hosted by: http://www.qsl.net> Please help support this email >> list: http://www.qsl.net/donate.html> Message delivered to l...@lnainc.com > >> __Elecraft >> mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: >> http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis >> list hosted by: http://www.qsl.netPlease help support this email list: >> http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to c-haw...@illinois.edu > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Keurig Pro Duo 5200 (they leak stuff out when you turn them upside down...) Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Feb 21, 2020, at 7:20 PM, Gary K9GS wrote: > > What's the MODEL number??73,Gary K9GS > Original message From: "hawley, charles j jr" > Date: 2/21/20 5:08 PM (GMT-06:00) To: > l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH > Subject: Re: [Elecraft] RFI issues This is the newest one that brews a carafe > of 10 cups or does a pod into your mug. I too have had others without any > noise, but this new one puts a huge sine wave of noise on the panadapter. I > have put ferrite on the line cord which don't affect it. I just turn the > thing off after brewing...or wait about 5 minutes and the noise goes away. > Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent from my iPad> On Feb > 21, 2020, at 11:42 AM, Lyn Norstad wrote:> > I've had > several of the inexpensive Keurig Pod type, and have never had an issue on > any band.> > Kitchen is right next door to the shack, and the pot is on all > day.> > Lyn> W0LEN> > > -Original Message-> From: > elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On > Behalf Of hawley, charles j jr> Sent: Thursday, February 20, 2020 2:04 PM> > To: W8JH> Cc: elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > > I still love the coffee maker and would buy it again. I just turn it off > after the pot or pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my > iPhone, cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH > wrote:>> >> ke9uw wrote>>> We bought a new Keurig coffee maker which does a > pot or also the pods. It>>> puts a huge noise out to the ham frequencies. > Have to turn it off to get>>> on 80M>> >> That is a serious conflict!>> >> > 80m morning greyline without caffeine, people cannot live this way!!>> >> >> > >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 happy > user.>> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> > __>> Elecraft > mailing list>> Home: http://mailman.qth.net/mailman/listinfo/elecraft>> Help: > http://mailman.qth.net/mmfaq.htm>> Post: mailto:Elecraft@mailman.qth.net>> >> > This list hosted by: http://www.qsl.net>> Please help support this email > list: http://www.qsl.net/donate.html>> Message delivered to > c-haw...@illinois.edu > > __> Elecraft > mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: > http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net> > > This list hosted by: http://www.qsl.net> Please help support this email list: > http://www.qsl.net/donate.html> Message delivered to l...@lnainc.com > > __Elecraft > mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: > http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis > list hosted by: http://www.qsl.netPlease help support this email list: > http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
I don't know the mx. I get it though, it's worked on switching supplies and I wind multiple turns. They did a great job on a treadmill. A different mix may be better because it seems like a lower frequency. Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Feb 21, 2020, at 5:35 PM, Jim Brown wrote: > > On 2/21/2020 3:08 PM, hawley, charles j jr wrote: >> I have put ferrite on the line cord which don't affect it. > > Which ferrite? There are dozens of different types. Did you just clamp one > on, or did you wind multiple turns through it as shown in these links? > http://k9yc.com/KillingReceiveNoise.pdf and > http://k9yc.com/KillingRXNoiseVisalia.pdf > > If you don't use the "right" ferrite and if you don't wind the "right" number > of turns for the band(s) where you hear the noise, the ferrite WON'T do > anything. > > 73, Jim K9YC > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
What's the MODEL number??73,Gary K9GS Original message From: "hawley, charles j jr" Date: 2/21/20 5:08 PM (GMT-06:00) To: l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH Subject: Re: [Elecraft] RFI issues This is the newest one that brews a carafe of 10 cups or does a pod into your mug. I too have had others without any noise, but this new one puts a huge sine wave of noise on the panadapter. I have put ferrite on the line cord which don't affect it. I just turn the thing off after brewing...or wait about 5 minutes and the noise goes away. Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent from my iPad> On Feb 21, 2020, at 11:42 AM, Lyn Norstad wrote:> > I've had several of the inexpensive Keurig Pod type, and have never had an issue on any band.> > Kitchen is right next door to the shack, and the pot is on all day.> > Lyn> W0LEN> > > -Original Message-> From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr> Sent: Thursday, February 20, 2020 2:04 PM> To: W8JH> Cc: elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > I still love the coffee maker and would buy it again. I just turn it off after the pot or pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my iPhone, cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH wrote:>> >> ke9uw wrote>>> We bought a new Keurig coffee maker which does a pot or also the pods. It>>> puts a huge noise out to the ham frequencies. Have to turn it off to get>>> on 80M>> >> That is a serious conflict!>> >> 80m morning greyline without caffeine, people cannot live this way!!>> >> >> >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 happy user.>> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> __>> Elecraft mailing list>> Home: http://mailman.qth.net/mailman/listinfo/elecraft>> Help: http://mailman.qth.net/mmfaq.htm>> Post: mailto:Elecraft@mailman.qth.net>> >> This list hosted by: http://www.qsl.net>> Please help support this email list: http://www.qsl.net/donate.html>> Message delivered to c-haw...@illinois.edu > __> Elecraft mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft@mailman.qth.net> > This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html> Message delivered to l...@lnainc.com > __Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/21/2020 3:08 PM, hawley, charles j jr wrote: I have put ferrite on the line cord which don't affect it. Which ferrite? There are dozens of different types. Did you just clamp one on, or did you wind multiple turns through it as shown in these links? http://k9yc.com/KillingReceiveNoise.pdf and http://k9yc.com/KillingRXNoiseVisalia.pdf If you don't use the "right" ferrite and if you don't wind the "right" number of turns for the band(s) where you hear the noise, the ferrite WON'T do anything. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
This is the newest one that brews a carafe of 10 cups or does a pod into your mug. I too have had others without any noise, but this new one puts a huge sine wave of noise on the panadapter. I have put ferrite on the line cord which don't affect it. I just turn the thing off after brewing...or wait about 5 minutes and the noise goes away. Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Feb 21, 2020, at 11:42 AM, Lyn Norstad wrote: > > I've had several of the inexpensive Keurig Pod type, and have never had an > issue on any band. > > Kitchen is right next door to the shack, and the pot is on all day. > > Lyn > W0LEN > > > -Original Message- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr > Sent: Thursday, February 20, 2020 2:04 PM > To: W8JH > Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] RFI issues > > I still love the coffee maker and would buy it again. I just turn it off > after the pot or pod is brewed. > > Chuck Jack Hawley > KE9UW > > Sent from my iPhone, cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH wrote: >> >> ke9uw wrote >>> We bought a new Keurig coffee maker which does a pot or also the pods. It >>> puts a huge noise out to the ham frequencies. Have to turn it off to get >>> on 80M >> >> That is a serious conflict! >> >> 80m morning greyline without caffeine, people cannot live this way!! >> >> >> >> >> - >> 73, >> >> Joe, W8JH >> >> K3s, KPA 500, KAT 500 and KX3 happy user. >> -- >> Sent from: http://elecraft.365791.n2.nabble.com/ >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to c-haw...@illinois.edu > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to l...@lnainc.com > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
(Sorry about the previous blank message -- this is now the ONLY mailgroup I'm subscribed to that refuses HTML-formatted mail, which is the default setting for my mail client). It's amazing the things that can cause issues. From my experience: 1) An automatic porch light sensor, the kind that screws in the light socket and then you screw the porch light bulb into it. It was putting out broadband hash across several bands, but only at night, when the light was on. 2) A Mr. Coffee coffee maker that had a little LED clock in the base, so you could set it to auto-brew in the morning. That little clock also put out broadband hash, whose tone tended to vary somewhat depending on what was currently on the display. I had to find it using a portable radio and finding that the kitchen outlets were 'singing' with the signal. 3) A doorbell transformer, that was mounted on the side of a light junction box in the basement, located above a false ceiling panel. The really annoying aspect was that the transformer didn't seem to be on any branch circuit. I finally discovered that the previous home owner had jumpered a couple of branch circuits in the breaker panel (?!), so turning off only one of the breakers didn't kill power to some outlets. This circuit was shared with the kitchen dishwasher, etc. outlets, and apparently they had had breaker trips from the overloaded circuit, so they just jumpered another breaker in parallel. After running additional circuits to put the dishwasher and garbage disposal, etc. on separate circuits (and removing the offending jumpers in the breaker box), I was finally able to isolate the doorbell transformer, which was subsequently replaced. It's been a while since I've done a 'whole house down' survey, and my noise floor has crept up again. In particular, I have a broadband noise that is 20 over S9 that wipes out the top half of 80 meters and all of 60 meters. I suspect it is my neighbor's U-Verse system twisted copper pair uplink which operates on those frequencies. "The second band is used in upstream and start at 3.75 MHz and end at 5.2 MHz " -- https://adslm.dohrenburg.net/uverse/ It's a never-ending challenge... Good luck, and 73, -- Dave, N8SBE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
__ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/21/2020 9:41 AM, Lyn Norstad wrote: Kitchen is right next door to the shack, and the pot is on all day. What matters is distance to antennas, not the shack. The nature of electrical wiring in your home also matters, because it's that wiring that radiates any noise produced. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
I've had several of the inexpensive Keurig Pod type, and have never had an issue on any band. Kitchen is right next door to the shack, and the pot is on all day. Lyn W0LEN -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of hawley, charles j jr Sent: Thursday, February 20, 2020 2:04 PM To: W8JH Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] RFI issues I still love the coffee maker and would buy it again. I just turn it off after the pot or pod is brewed. Chuck Jack Hawley KE9UW Sent from my iPhone, cjack > On Feb 20, 2020, at 12:12 PM, W8JH wrote: > > ke9uw wrote >> We bought a new Keurig coffee maker which does a pot or also the pods. It >> puts a huge noise out to the ham frequencies. Have to turn it off to get >> on 80M > > That is a serious conflict! > > 80m morning greyline without caffeine, people cannot live this way!! > > > > > - > 73, > > Joe, W8JH > > K3s, KPA 500, KAT 500 and KX3 happy user. > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to l...@lnainc.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
RF overload can do a lot of things. Try above and below 12W (8W on 6m) to see if the KPA3 is swamped. Or an antenna on the RX port (If KXV3 equipped). Also RF overload can excite any loose connections at the tower site, rusty metal, fence joints etc. You are just going to have to sniff around with a portable setup. Keith WE6R __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
I still love the coffee maker and would buy it again. I just turn it off after the pot or pod is brewed. Chuck Jack Hawley KE9UW Sent from my iPhone, cjack > On Feb 20, 2020, at 12:12 PM, W8JH wrote: > > ke9uw wrote >> We bought a new Keurig coffee maker which does a pot or also the pods. It >> puts a huge noise out to the ham frequencies. Have to turn it off to get >> on 80M > > That is a serious conflict! > > 80m morning greyline without caffeine, people cannot live this way!! > > > > > - > 73, > > Joe, W8JH > > K3s, KPA 500, KAT 500 and KX3 happy user. > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/20/2020 10:22 AM, Victor Rosenthal 4X6GP wrote: Not so fast. The K3's T/R switch can be overwhelmed by very strong signals. The result is intermod junk all over the bands. This happened to me with a 50 kW AM BC signal at about 1000 kHz that is line-of-sight to my antenna. I don't see why a super-strong VHF signal couldn't have the same effect. AM BC signals are far more likely to cause issues because 1) they are much closer in frequency (as a percentage) than VHF/UHF, so 2) our antennas tend to be far less efficient receiving them, and 3) feedline loss is high at VHF/UHF, due both to normal increase in loss with frequency and because the feedline is poorly matched to the RX at VHF/UHF. Also, AM BC transmitters often combine in non-linear junctions to produce IMD that ON_FREQUENCY in our bands. I first experienced this more than 60 years ago, when local 5kW stations on 930 kHz and 1470 kHz put a monster product on 3870 kHz, wiping out the WV AM net on 3890. The IM often occurs in the TX output stage; because FM and TV TX antennas are often in close proximity to other BC and 2-way TX sites, it is common for these TX to include a device called a "circulator" that prevents signal from another TX to backfeed into their own output stage, where rectification can occur, but it is far less common for AM stations to include comparable networks. In addition, of course, rectification can occur almost anywhere. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
We gave our plasma TV to our parish and I bought my wife a new LED TV so she could watch her programs and I could operate HF without the horrible noise from the plasma TV! 73, Bill, K8TE I still have a neighbor with a noisy plasma TV -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Not so fast. The K3's T/R switch can be overwhelmed by very strong signals. The result is intermod junk all over the bands. This happened to me with a 50 kW AM BC signal at about 1000 kHz that is line-of-sight to my antenna. I don't see why a super-strong VHF signal couldn't have the same effect. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ On 20-Feb-2020 20:10, Fred Jensen wrote: Andreas: The probability that your noise is due to the TV or FM station is extremely low [like really zero]. Meadow Lakes CA is the "TV/FM capital" for the southern Central Valley [Fresno], and my 2m HT goes full bars about 2 miles from the complex on both FM and AM [aeronautical band]. When at the repeater site next to a 300 KW digital TV station, my comrade's HT won't break my squelch. It is just front end overload from way out of band, there is no discernible noise. The number of noise makers we normally see in urban/suburban areas is almost countably infinite. In addition to the 24/7 constant hash from SMPS, I have a variety of intermittant noise sources that come and go with periods ranging from a few seconds [probably the A/C motor starting at the gym behind us] to an hour or so. One is a sequence of synchronized carriers on the waterfall about 7 kHz apart that last for a few seconds and then burst into roman candles that fog up the WF and then fade in 2 or 3 seconds. Neighbor 4 doors down the street just installed rooftop solar which I can now see on the P3 on 160 and 80. [:=( K9YC's RFI notes pretty much cover searching for and fixing RFI. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
It's really important to make sure you're listening to the right source. One way to do that is to listen to the audio from your home receiver (AM mode, AGC off, RF gain backed down to avoid overload) while you are searching. There will be a pattern of fluctuations. When they match, you have the right source. You can relay the home receiver by phone, VHF/UHF, etc. 73, Scott K9MA On 2/20/2020 11:48, Phil Hystad via Elecraft wrote: I once had a noise issue and I used my KX3 roving about the neighborhood to find it. Actually, I found a number of loud noise sources doing that as I moved around. It seems that if the noise level is fairly constant as you move around the area but will within the same general distance from the TV/FM station antennas you could isolate the source as those antennas or something else. 73, phil, K7PEH On Feb 20, 2020, at 9:42 AM, Jim Brown wrote: On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote: Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight. Do you have neighbors? Did you pull their breakers at the same time? Do you have a UPS? They continue to run without power, so both they and any connected equipment can create noise. Did you take the time to study the link I posted? 73, Jim K9YC __ -- Scott K9MA k...@sdellington.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
ke9uw wrote > We bought a new Keurig coffee maker which does a pot or also the pods. It > puts a huge noise out to the ham frequencies. Have to turn it off to get > on 80M That is a serious conflict! 80m morning greyline without caffeine, people cannot live this way!! - 73, Joe, W8JH K3s, KPA 500, KAT 500 and KX3 happy user. -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Andreas: The probability that your noise is due to the TV or FM station is extremely low [like really zero]. Meadow Lakes CA is the "TV/FM capital" for the southern Central Valley [Fresno], and my 2m HT goes full bars about 2 miles from the complex on both FM and AM [aeronautical band]. When at the repeater site next to a 300 KW digital TV station, my comrade's HT won't break my squelch. It is just front end overload from way out of band, there is no discernible noise. The number of noise makers we normally see in urban/suburban areas is almost countably infinite. In addition to the 24/7 constant hash from SMPS, I have a variety of intermittant noise sources that come and go with periods ranging from a few seconds [probably the A/C motor starting at the gym behind us] to an hour or so. One is a sequence of synchronized carriers on the waterfall about 7 kHz apart that last for a few seconds and then burst into roman candles that fog up the WF and then fade in 2 or 3 seconds. Neighbor 4 doors down the street just installed rooftop solar which I can now see on the P3 on 160 and 80. [:=( K9YC's RFI notes pretty much cover searching for and fixing RFI. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 2/20/2020 9:42 AM, Jim Brown wrote: On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote: Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight. Do you have neighbors? Did you pull their breakers at the same time? Do you have a UPS? They continue to run without power, so both they and any connected equipment can create noise. Did you take the time to study the link I posted? 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
I once had a noise issue and I used my KX3 roving about the neighborhood to find it. Actually, I found a number of loud noise sources doing that as I moved around. It seems that if the noise level is fairly constant as you move around the area but will within the same general distance from the TV/FM station antennas you could isolate the source as those antennas or something else. 73, phil, K7PEH > On Feb 20, 2020, at 9:42 AM, Jim Brown wrote: > > On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote: >> Yes, I did run the K3 off of a battery and pulled the main AC breaker. >> Didn’t make any difference. Thus my suspicion that the RFI is related to the >> 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 >> miles and in direct line of sight. > > Do you have neighbors? Did you pull their breakers at the same time? > > Do you have a UPS? They continue to run without power, so both they and any > connected equipment can create noise. > > Did you take the time to study the link I posted? > > 73, Jim K9YC > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to phys...@mac.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote: Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight. Do you have neighbors? Did you pull their breakers at the same time? Do you have a UPS? They continue to run without power, so both they and any connected equipment can create noise. Did you take the time to study the link I posted? 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/19/2020 7:12 AM, Gmail - George wrote: Andreas, You might want to go to the station and talk the the Chief Engineer. If he is the nice-guygal type CE he will help you (Not al CEs are the nice kind but most are). Maybe in 1960, but no way in 2020. Besides, it is quite unlikely that these stations are causing your problem, but as has been observed, a simple LPF inserted in the antenna will prevent those TX from hitting your RX. George is right on about antenna directivity and the spectrum analyzer display. As I observed earlier, the FAR more likely source(s) of your noise are dozens of switch-mode power supplies in your home and the homes of each of your neighbors, other equipment that includes power control electronics, and equipment that includes microprocessors. This link can query the FCC website to see technical details for any broadcast station in the US. https://www.fcc.gov/media/radio/am-query 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
FWIW: We recently gave up the grinder, we found that the very fine ground in the store made much better coffee than what we could get from whole beans in our grinder. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 2/19/2020 1:31 PM, Wes wrote: Me too. I was just complaining to my XYL about having to fill the bean grinder, grind the beans, and water the brewer and suggested getting one. They use them in her law office but she said no, she likes fresh ground. I guess this ends that idea. Wes N7WS On 2/19/2020 5:17 AM, Dave Cole wrote: Thanks, I was considering one of those... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 7:55 PM, hawley, charles j jr wrote: We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M Chuck Jack Hawley KE9UW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k6...@foothill.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Me too. I was just complaining to my XYL about having to fill the bean grinder, grind the beans, and water the brewer and suggested getting one. They use them in her law office but she said no, she likes fresh ground. I guess this ends that idea. Wes N7WS On 2/19/2020 5:17 AM, Dave Cole wrote: Thanks, I was considering one of those... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 7:55 PM, hawley, charles j jr wrote: We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M Chuck Jack Hawley KE9UW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Andreas, TV transmitters at 500 MHz +- are really not noise disrupters in our amateur HF world. In fact, in our AREDN mesh work in LA, we’ve found that Ubiquiti sector antennas at 3 GHz and 5 GHz producing just milliwatts of power play nicely next to commercial TV transmitters generating 1.5-million watts at 500 MHz. So it’s something else. A few years ago, I was on a similar RF noise hunt in my systems which reside in central LA, an RF noisy place. Some things I learned: 1) Pay close attention to how your power supply is connected. Use shielded twisted pair wiring from your power supply to your radio, and do not use red-black zip line. Unless twisted, that untwisted cable becomes an excellent antenna delivering noise to your system. In fact, pay attention to all cables. Make sure they are shielded. 2) Hunt for noise makers. At that time I made the really dumb mistake of having two touch lamps near my radios — ya know, ya hit the base to raise or lower brightness. Those things will make noise for miles. Away they went. 3) Older plasma flat screens (pre-LCD) are noise makers. Most light dimmers. Someone even had a coffee maker with a loose heating coil connection that was through the roof with noise. 4) In my hunt for noise makers, I used an aircraft band hand-held receiver (that’s AM), squelch off, and just walk around touching the antenna to things.. Eye opening. Ya know what my biggest noise maker was near my radios?! My D-Link switch which lives under the desk not 3 feet from my HF radio. Further all of those CAT6 cables were great little antennas just spreading that noise all over. Solution: feed the switch highly filtered power and change all cables to CAT7 which is heavily shielded CAT6. Made a big difference. 5) Ferrite beads, clamp-ons. Get a bunch. Put them on every cable. Double up on the coax. Keep standing waves away. You want to discourage RF from traveling in places where it should not go. Ferrites are wonderful. Get 'em on Amazon. 6) Grounding. There are several well-known AC filtering devices that can add an extra ground to your AC mains coming into your radios. 7) Switching power supplies. Those wall-worts. Noisy beasts. Best to use a centralized, filtered 12V DC system that eliminates those wall worts altogether. One of the worst noise makers near my radios was a lovely, beautiful LG display which could not be plugged into my highly filtered and shielded 12V DC system because they run own 24V. Switched it out with a nice Samsung which runs on 12V and it runs totally quiet. Good luck. The hunt may take a while But these steps took my urban noise from S7 to S1. Was worth the time. David Ahrendts, KK6DA, Los Angeles __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Andreas, You might want to go to the station and talk the the Chief Engineer. If he is the nice-guygal type CE he will help you (Not al CEs are the nice kind but most are). I'd suggest that he/she cycle the two transmitters on/off while you are at your station. He/She won't do that during the early news but might at 2 or 3 AM. It is worth a try. Long ago - I had the opposite issue when ham transmitters interfered with TV receivers. Some people call the TV station to resolve the issue. Most of the time it came down to who was going to buy the filter. At any given time we probably had 10 filters on the shelf. One point - TV (especially UHF) antennas tend to fairly high gain. The pattern tends to be omnidirectional horizontally. The gain is in the vertical plane. Much of the transmitted power is well above 10° (probably much higher). The FM antenna gain depends on the size transmitter. Usually they tend to use lower gain than TV antennas. In a spectrum analyzer - the digital TV looks like high power noise. The signal should square corners on both ends of the occupied spectrum. 73 George AI4VZ -Original Message- From: Andreas Wachter via Elecraft I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Thanks, I was considering one of those... 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 7:55 PM, hawley, charles j jr wrote: We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M Chuck Jack Hawley KE9UW Sent from my iPhone, cjack On Feb 18, 2020, at 5:51 PM, Bill Lederer wrote: House we just moved into, we did new under-the-counter lighting. Once I got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and it becomes quiet. Other led panel lights produce no noise whatsoever. But now that that is identified, I will be tracking down some other noise, likely in the neighborhood. w8lvn On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar wrote: Had a similar issue moving to a new QTH. It turned out to be a bad transformer in the neighborhood. You could call in an RFI complaint once you rule out your own QTH and asked them to sniff around. You can also sniff around with a 2 or 6 meter SSB rig if you have one. Fred KE4Q On Tue, Feb 18, 2020, 5:47 PM Michael Walker wrote: HI Andreas Sorry to hear about your noise. I doubt your noise is related to digital TV as that is a long way away in the frequency world. It is pretty common to assume that it is not on your own property. I saw one guy who said the same thing and then found out a year later it was his new dryer that was noisy even when they were not using it. I would not be surprised that most of your HF noise is within your own property unless you did some significant research by holding an AM radio near each and every power cube or charger for phones, etc. There are not too many that are quiet. I use my KX2 to find most of my HF noise issues and I must have tossed out 15 bad chargers. The ones I could not just toss away, I had to add Mix 31 chokes to. When you moved into your new house did you replace all the light bulbs with LED bulbs? They can be noisy. If you haven't taken the time to do an indepth study on your own house, you should. You might be surprised. I would plan an all day exercise when everyone is out of the house. Mike va3mw On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: Hi, I might suspect something else... Have you done a power off test of your home yet? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to va...@portcredit.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to fnassa...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w8lv...@gmail.com -- --w8lvn-- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:
Re: [Elecraft] RFI issues
We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M Chuck Jack Hawley KE9UW Sent from my iPhone, cjack > On Feb 18, 2020, at 5:51 PM, Bill Lederer wrote: > > House we just moved into, we did new under-the-counter lighting. Once I > got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and > it becomes quiet. > > Other led panel lights produce no noise whatsoever. > > But now that that is identified, I will be tracking down some other noise, > likely in the neighborhood. > > w8lvn > >> On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar wrote: >> >> Had a similar issue moving to a new QTH. It turned out to be a bad >> transformer in the neighborhood. You could call in an RFI complaint once >> you rule out your own QTH and asked them to sniff around. >> >> You can also sniff around with a 2 or 6 meter SSB rig if you have one. >> >> Fred >> KE4Q >> >>> On Tue, Feb 18, 2020, 5:47 PM Michael Walker wrote: >>> >>> HI Andreas >>> >>> Sorry to hear about your noise. >>> >>> I doubt your noise is related to digital TV as that is a long way away in >>> the frequency world. It is pretty common to assume that it is not on >> your >>> own property. I saw one guy who said the same thing and then found out a >>> year later it was his new dryer that was noisy even when they were not >>> using it. >>> >>> I would not be surprised that most of your HF noise is within your own >>> property unless you did some significant research by holding an AM radio >>> near each and every power cube or charger for phones, etc. There are not >>> too many that are quiet. >>> >>> I use my KX2 to find most of my HF noise issues and I must have tossed >> out >>> 15 bad chargers. The ones I could not just toss away, I had to add Mix >> 31 >>> chokes to. >>> >>> When you moved into your new house did you replace all the light bulbs >> with >>> LED bulbs? They can be noisy. >>> >>> If you haven't taken the time to do an indepth study on your own house, >> you >>> should. You might be surprised. I would plan an all day exercise when >>> everyone is out of the house. >>> >>> Mike va3mw >>> >>> On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: >>> Hi, I might suspect something else... Have you done a power off test of your home yet? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: > I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable >> to use my K3: solid S9+ noise on all bands using a makeshift dipole strung >>> up on some trees outside my house. I’ve tried to locate the source of the >>> RFI within my home but so far have been unable to locate any RFI emanating >>> from within my home. Could it be that the TV/FM stations antenna towers, >> which are within direct line of sight from my house, might be responsible for >>> the RFI? > > 73, Andreas > > K6AKW > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to d...@nk7z.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to va...@portcredit.net >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to fnassa...@gmail.com >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this
Re: [Elecraft] RFI issues
Does the noise appear on one band or several bands? Is it tune-able thus limited to one broad frequency or just total broadband noise? You will need to know the frequency of both transmitters and then perform an IM study. The sum of those two frequencies is doubtful but the difference could be fall in the ham band(s). You can contact the FM station and the TV station engineering department and inquire as to when they have transmitter maintenance scheduled. What ever day or hour of the night that might be, you need to be listening. If it doesn't go away, it isn't them. If it does, that doesn't assure they are at fault. I've seen chain link fences make a nice diode junction and it radiates like crazy. Here is a link that will simplify the calculations. http://radiomobile.pe1mew.nl/?RF_Aids:On-Line_calculators:Intermodulation 73 Bob, K4TAX On 2/18/2020 6:38 PM, Andreas Wachter via Elecraft wrote: Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight. 73, Andreas K6AKW On Feb 18, 2020, at 10:00 AM, Hank wrote: Have you tried pulling your main AC breaker and running your K3 on a car battery? That way, you are sure that nothing in your house (switching power supplies, poor mechanical joints, etc.) is creating the noise. I was able to convince my nearest neighbors to shut down their AC panels also after my house seemed "clean". I finally found 2 bad crimped power line connections down the street from my and a home made fence charge at a goat farm about 300yds behind my house through the woods. Another ham and the local power company came and helped. The power company did their work and it cleared up several S units, but something was still there. Riding around with a scanner tuned to 1800kHz (AM mode) with no antenna connected yielded the goat fence. The power company came out with a listening device to verify my findings. I offered to buy the farmer a fence charger from the hardware store, but he went ahead and did it on his own - it really helped having the power company there!! I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire out the window nulls it out quite well when the TV in on. Eventually the TV will die (I'm hoping). Good luck! Hank K4HYJ - Original Message - From: Andreas Wachter via Elecraft (elecraft@mailman.qth.net) Date: 02/18/20 12:39 To: elecraft@mailman.qth.net Subject: [Elecraft] RFI issues I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to h...@optilink.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
One of the first things to try is to operate the station receiver from a battery, disconnect everything including the external ground, but the antenna. Then drop the mains breaker to the property. If the noise changes, then some or part of it is on your property. If the noise does not change then it is most likely not on your property. Don't forget about any UPS that you may have on the property. It must be turned off as well. Our fiber internet service has a battery back-up at the demarcation. You may need to unplug that unit as well. If it is not on your property, I suggest a portable AM radio tuned to 1700 or such if there is not local station on the frequency. Most of those radios have a rod antenna that is bi-directional. Use it as a null device as the null will be much more pronounced than trying to peak the noise. Headphones or earbuds will help. You'll need a local / sub division map. Mark the axis of the radio on the map, then move over 100 to 300 yards to the side and do the same. Usually 3 or 4 sites will have the lines intersect. You can then move to that location. Worst case, should you have 2 or more noise sources which are then a real challenge to chase. If it is on your property, then drop every individual breaker, bring the mains back on and observe. Then add one breaker and observe. Add the next breaker and observe. Finally you will find the 2 or 3 that contributes greatly to the noise. Then you can check the devices on each one. Don't forget about the doorbell transformer. Those go bad, make noise, yet the doorbell will still work. Once the location is known, then contact the property owner or the local utility. You may have to be persistent with the local utility, move up the chain of command, but diplomacy along every step goes a long way to getting something done. It is also worthwhile to note the day and the times the observations were made. It could be related to something only furing the day or only at night or maybe on each Wednesday and Friday etc. I doubt it is anything from the TV stations. 73 Bob, K4TAX On 2/18/2020 4:45 PM, Michael Walker wrote: HI Andreas Sorry to hear about your noise. I doubt your noise is related to digital TV as that is a long way away in the frequency world. It is pretty common to assume that it is not on your own property. I saw one guy who said the same thing and then found out a year later it was his new dryer that was noisy even when they were not using it. I would not be surprised that most of your HF noise is within your own property unless you did some significant research by holding an AM radio near each and every power cube or charger for phones, etc. There are not too many that are quiet. I use my KX2 to find most of my HF noise issues and I must have tossed out 15 bad chargers. The ones I could not just toss away, I had to add Mix 31 chokes to. When you moved into your new house did you replace all the light bulbs with LED bulbs? They can be noisy. If you haven't taken the time to do an indepth study on your own house, you should. You might be surprised. I would plan an all day exercise when everyone is out of the house. Mike va3mw On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: Hi, I might suspect something else... Have you done a power off test of your home yet? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to
Re: [Elecraft] RFI issues
Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight. 73, Andreas K6AKW > On Feb 18, 2020, at 10:00 AM, Hank wrote: > > > Have you tried pulling your main AC breaker and running your K3 on a car > battery? That way, you are sure that nothing in your house (switching power > supplies, poor mechanical joints, etc.) is creating the noise. > > > I was able to convince my nearest neighbors to shut down their AC panels also > after my house seemed "clean". > > > I finally found 2 bad crimped power line connections down the street from my > and a home made fence charge at a goat farm about 300yds behind my house > through the woods. Another ham and the local power company came and helped. > The power company did their work and it cleared up several S units, but > something was still there. Riding around with a scanner tuned to 1800kHz (AM > mode) with no antenna connected yielded the goat fence. The power company > came out with a listening device to verify my findings. I offered to buy the > farmer a fence charger from the hardware store, but he went ahead and did it > on his own - it really helped having the power company there!! > > I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire > out the window nulls it out quite well when the TV in on. Eventually the TV > will die (I'm hoping). > > Good luck! > Hank > K4HYJ > > > - Original Message - > From: Andreas Wachter via Elecraft (elecraft@mailman.qth.net) > Date: 02/18/20 12:39 > To: elecraft@mailman.qth.net > Subject: [Elecraft] RFI issues > > I live about 1.6 miles from some tall antenna towers broadcasting digital TV > (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 > kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I > moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise > on all bands using a makeshift dipole strung up on some trees outside my > house. I’ve tried to locate the source of the RFI within my home but so far > have been unable to locate any RFI emanating from within my home. Could it be > that the TV/FM stations antenna towers, which are within direct line of sight > from my house, might be responsible for the RFI? > > 73, Andreas > > K6AKW > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to h...@optilink.us > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Have you inquired at a local ham radio club for help with your RFI/EMI issues for assistance in finding the problem? I doubt transmitters 1.6 miles away would create problems for you. 73, Keith, N6JPA On 2/18/2020 8:29 AM, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to n6jp...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
House we just moved into, we did new under-the-counter lighting. Once I got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and it becomes quiet. Other led panel lights produce no noise whatsoever. But now that that is identified, I will be tracking down some other noise, likely in the neighborhood. w8lvn On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar wrote: > Had a similar issue moving to a new QTH. It turned out to be a bad > transformer in the neighborhood. You could call in an RFI complaint once > you rule out your own QTH and asked them to sniff around. > > You can also sniff around with a 2 or 6 meter SSB rig if you have one. > > Fred > KE4Q > > On Tue, Feb 18, 2020, 5:47 PM Michael Walker wrote: > > > HI Andreas > > > > Sorry to hear about your noise. > > > > I doubt your noise is related to digital TV as that is a long way away in > > the frequency world. It is pretty common to assume that it is not on > your > > own property. I saw one guy who said the same thing and then found out a > > year later it was his new dryer that was noisy even when they were not > > using it. > > > > I would not be surprised that most of your HF noise is within your own > > property unless you did some significant research by holding an AM radio > > near each and every power cube or charger for phones, etc. There are not > > too many that are quiet. > > > > I use my KX2 to find most of my HF noise issues and I must have tossed > out > > 15 bad chargers. The ones I could not just toss away, I had to add Mix > 31 > > chokes to. > > > > When you moved into your new house did you replace all the light bulbs > with > > LED bulbs? They can be noisy. > > > > If you haven't taken the time to do an indepth study on your own house, > you > > should. You might be surprised. I would plan an all day exercise when > > everyone is out of the house. > > > > Mike va3mw > > > > > > On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: > > > > > Hi, > > > > > > I might suspect something else... > > > > > > Have you done a power off test of your home yet? > > > > > > 73, and thanks, > > > Dave (NK7Z) > > > https://www.nk7z.net > > > ARRL Volunteer Examiner > > > ARRL Technical Specialist > > > ARRL Asst. Director, NW Division, Technical Resources > > > > > > On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: > > > > I live about 1.6 miles from some tall antenna towers broadcasting > > > digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM > > > (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and > > > KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable > to > > > use my K3: solid S9+ noise on all bands using a makeshift dipole strung > > up > > > on some trees outside my house. I’ve tried to locate the source of the > > RFI > > > within my home but so far have been unable to locate any RFI emanating > > from > > > within my home. Could it be that the TV/FM stations antenna towers, > which > > > are within direct line of sight from my house, might be responsible for > > the > > > RFI? > > > > > > > > 73, Andreas > > > > > > > > K6AKW > > > > __ > > > > Elecraft mailing list > > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > > Help: http://mailman.qth.net/mmfaq.htm > > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > > > This list hosted by: http://www.qsl.net > > > > Please help support this email list: http://www.qsl.net/donate.html > > > > Message delivered to d...@nk7z.net > > > > > > > __ > > > Elecraft mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > This list hosted by: http://www.qsl.net > > > Please help support this email list: http://www.qsl.net/donate.html > > > Message delivered to va...@portcredit.net > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to fnassa...@gmail.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w8lv...@gmail.com -- --w8lvn-- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:
Re: [Elecraft] RFI issues
Had a similar issue moving to a new QTH. It turned out to be a bad transformer in the neighborhood. You could call in an RFI complaint once you rule out your own QTH and asked them to sniff around. You can also sniff around with a 2 or 6 meter SSB rig if you have one. Fred KE4Q On Tue, Feb 18, 2020, 5:47 PM Michael Walker wrote: > HI Andreas > > Sorry to hear about your noise. > > I doubt your noise is related to digital TV as that is a long way away in > the frequency world. It is pretty common to assume that it is not on your > own property. I saw one guy who said the same thing and then found out a > year later it was his new dryer that was noisy even when they were not > using it. > > I would not be surprised that most of your HF noise is within your own > property unless you did some significant research by holding an AM radio > near each and every power cube or charger for phones, etc. There are not > too many that are quiet. > > I use my KX2 to find most of my HF noise issues and I must have tossed out > 15 bad chargers. The ones I could not just toss away, I had to add Mix 31 > chokes to. > > When you moved into your new house did you replace all the light bulbs with > LED bulbs? They can be noisy. > > If you haven't taken the time to do an indepth study on your own house, you > should. You might be surprised. I would plan an all day exercise when > everyone is out of the house. > > Mike va3mw > > > On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: > > > Hi, > > > > I might suspect something else... > > > > Have you done a power off test of your home yet? > > > > 73, and thanks, > > Dave (NK7Z) > > https://www.nk7z.net > > ARRL Volunteer Examiner > > ARRL Technical Specialist > > ARRL Asst. Director, NW Division, Technical Resources > > > > On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: > > > I live about 1.6 miles from some tall antenna towers broadcasting > > digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM > > (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and > > KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to > > use my K3: solid S9+ noise on all bands using a makeshift dipole strung > up > > on some trees outside my house. I’ve tried to locate the source of the > RFI > > within my home but so far have been unable to locate any RFI emanating > from > > within my home. Could it be that the TV/FM stations antenna towers, which > > are within direct line of sight from my house, might be responsible for > the > > RFI? > > > > > > 73, Andreas > > > > > > K6AKW > > > __ > > > Elecraft mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > This list hosted by: http://www.qsl.net > > > Please help support this email list: http://www.qsl.net/donate.html > > > Message delivered to d...@nk7z.net > > > > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to va...@portcredit.net > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to fnassa...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
HI Andreas Sorry to hear about your noise. I doubt your noise is related to digital TV as that is a long way away in the frequency world. It is pretty common to assume that it is not on your own property. I saw one guy who said the same thing and then found out a year later it was his new dryer that was noisy even when they were not using it. I would not be surprised that most of your HF noise is within your own property unless you did some significant research by holding an AM radio near each and every power cube or charger for phones, etc. There are not too many that are quiet. I use my KX2 to find most of my HF noise issues and I must have tossed out 15 bad chargers. The ones I could not just toss away, I had to add Mix 31 chokes to. When you moved into your new house did you replace all the light bulbs with LED bulbs? They can be noisy. If you haven't taken the time to do an indepth study on your own house, you should. You might be surprised. I would plan an all day exercise when everyone is out of the house. Mike va3mw On Tue, Feb 18, 2020 at 2:25 PM Dave Cole wrote: > Hi, > > I might suspect something else... > > Have you done a power off test of your home yet? > > 73, and thanks, > Dave (NK7Z) > https://www.nk7z.net > ARRL Volunteer Examiner > ARRL Technical Specialist > ARRL Asst. Director, NW Division, Technical Resources > > On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: > > I live about 1.6 miles from some tall antenna towers broadcasting > digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM > (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and > KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to > use my K3: solid S9+ noise on all bands using a makeshift dipole strung up > on some trees outside my house. I’ve tried to locate the source of the RFI > within my home but so far have been unable to locate any RFI emanating from > within my home. Could it be that the TV/FM stations antenna towers, which > are within direct line of sight from my house, might be responsible for the > RFI? > > > > 73, Andreas > > > > K6AKW > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to d...@nk7z.net > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to va...@portcredit.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Hi, I might suspect something else... Have you done a power off test of your home yet? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
I have some pages which might help locate your RFI at: https://www.nk7z.net/i-have-rfi-now-what-locating-it/ Also Jim Brown has a ton of data at: http://www.audiosystemsgroup.com/publish.htm 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
On 2/18/2020 8:29 AM, Andreas Wachter via Elecraft wrote: Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? Very unlikely. This application not provides lots of advice on finding and killing noise. http://k9yc.com/KillingReceiveNoise.pdf 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
Have you tried pulling your main AC breaker and running your K3 on a car battery? That way, you are sure that nothing in your house (switching power supplies, poor mechanical joints, etc.) is creating the noise. I was able to convince my nearest neighbors to shut down their AC panels also after my house seemed "clean". I finally found 2 bad crimped power line connections down the street from my and a home made fence charge at a goat farm about 300yds behind my house through the woods. Another ham and the local power company came and helped. The power company did their work and it cleared up several S units, but something was still there. Riding around with a scanner tuned to 1800kHz (AM mode) with no antenna connected yielded the goat fence. The power company came out with a listening device to verify my findings. I offered to buy the farmer a fence charger from the hardware store, but he went ahead and did it on his own - it really helped having the power company there!! I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire out the window nulls it out quite well when the TV in on. Eventually the TV will die (I'm hoping). Good luck! Hank K4HYJ - Original Message - From: Andreas Wachter via Elecraft (elecraft@mailman.qth.net) Date: 02/18/20 12:39 To: elecraft@mailman.qth.net Subject: [Elecraft] RFI issues I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to h...@optilink.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] RFI issues
One thing to try is an old-fashioned lowpass filter, such as used to be common as a measure against TVI. If the problem is caused by the TV/FM signals, this should help. The K3's t/r switch can be overwhelmed by massive signals. I had such a problem with a 50 kW AM BC station that's visible from my antenna. I solved it by switching from vertical to horizontal polarization, but a high-pass filter also worked. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ On 18/02/2020 18:29, Andreas Wachter via Elecraft wrote: I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI? 73, Andreas K6AKW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k2vco@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
