Re: Topband: 200 Amp low pass filter for power mains?
Try the easy stuff first – I had a similar situation a few months ago and got rid of most of it by adding a pair of 0.1 mfd (400 v) capacitors across each leg of the 220 vac line inside the junction box. GL Jay NY2NY _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: 200 Amp low pass filter for power mains?
Any lineman can help you determine whether a smart meter is causing a continuous problem. Just have him pull the meter while you check for RFI. I doubt whether this RFI is coming through your power lines. My meter --or rather the modified 60 Hz line voltage used to read it-- causes some RFI. But it "only" lasts about 5 seconds each time. 73, Mike W0BTU On Fri, Jan 24, 2020, 10:38 PM m.r.c. wrote: > > I think it unlikely, but possible that the smart meter is involved. > Usually the smart meter is across > the lines ahead of the main breaker. > > Unfortunately, most utilities have cut budgets so far that getting an > appointment with an RFI qualified > person will often take months- if they even have someone qualified on > staff any more. > _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: 200 Amp low pass filter for power mains?
Check your door bell transformer. And the button. If you shut off the main breaker and the noise is gone it is likely something energized by the main power is generating noise. If you switch off ALL the load breakers at the same time, the noise should be the same as when you shut off the main. Turn them back on one at a time and wait at least 30 seconds between to see if the noise takes a few moments to come back after power is applied. If the noise is present with the mains ON and ALL load breakers OFF at the same time, call a qualified electrician to open the power box and start hunting for the source. I think it unlikely, but possible that the smart meter is involved. Usually the smart meter is across the lines ahead of the main breaker. Unfortunately, most utilities have cut budgets so far that getting an appointment with an RFI qualified person will often take months- if they even have someone qualified on staff any more. They used to have teams led by a really experienced person, and they were quite good at their jobs. Not so much any more. Robin WA6CDR - Original Message - From: "Larry via Topband" To: Cc: ; Sent: Friday, January 24, 2020 12:18 Subject: Re: Topband: 200 Amp low pass filter for power mains? Your local power company is responsible to provide RFI free power. If you have determined that your noise is not coming from sources in your home then a friendly phone call to the power company may solve the problem. Most power companys have a trained RFI tech that can help. Good luck. Larry N7dd Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com On Friday, January 24, 2020, Richard (Rick) Karlquist wrote: On 1/24/2020 10:21 AM, Ron AE5E via Topband wrote: I think a good share of noise on 160 for me is coming in on the power line. The ground mounted transformer is about 1000' feet away and serves other homes as well as mine. The lines are all buried. Where it entered the house I would like to try to suppress noise. I can turn off all lights, appliances, furnace, pumps, etc but the noise is still significant. If I drop the main breaker it is gone. So that is why it seems to me it is on the line when it enters the house. So thinking a 200 amp low pass filer before the breaker box might the a solution. Maybe it just needs to be bypassed with capacitors, I am only speculating so far. So lets hear if from Topband guys who have figured this out! Ron, AE5E _ I suspect you still have something energized in your house. Try this: turn the main breaker off and then hold a pocket AM radio next to the energized mains listening for noise and then compare to the "de-energized" lines in your house. I am thinking you will hear no noise in either case. If your theory was correct, you would hear noise on the mains coming in and nothing on the house wiring. In any event, a 200A RFI filter is a non-starter. If the noise is somehow on the mains coming in, you need to move your antenna away from your house wiring. Possibly listen on a loop antenna that you can locate in a corner of your yard, and then orient it to null the remaining noise. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: 200 Amp low pass filter for power mains?
Your local power company is responsible to provide RFI free power. If you have determined that your noise is not coming from sources in your home then a friendly phone call to the power company may solve the problem. Most power companys have a trained RFI tech that can help. Good luck. Larry N7dd Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com On Friday, January 24, 2020, Richard (Rick) Karlquist wrote: On 1/24/2020 10:21 AM, Ron AE5E via Topband wrote: > I think a good share of noise on 160 for me is coming in on the power line. > The ground mounted transformer is about 1000' feet away and serves other > homes as well as mine. The lines are all buried. Where it entered the house > I would like to try to suppress noise. > I can turn off all lights, appliances, furnace, pumps, etc but the noise is > still significant. If I drop the main breaker it is gone. So that is why it > seems to me it is on the line when it enters the house. > So thinking a 200 amp low pass filer before the breaker box might the a > solution. Maybe it just needs to be bypassed with capacitors, I am only > speculating so far. > So lets hear if from Topband guys who have figured this out! > Ron, AE5E > _ I suspect you still have something energized in your house. Try this: turn the main breaker off and then hold a pocket AM radio next to the energized mains listening for noise and then compare to the "de-energized" lines in your house. I am thinking you will hear no noise in either case. If your theory was correct, you would hear noise on the mains coming in and nothing on the house wiring. In any event, a 200A RFI filter is a non-starter. If the noise is somehow on the mains coming in, you need to move your antenna away from your house wiring. Possibly listen on a loop antenna that you can locate in a corner of your yard, and then orient it to null the remaining noise. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: 200 Amp low pass filter for power mains?
“ I suspect you still have something energized in your house” Been there, done thatin my case battery backup in the modem for the voip telephone, terrible square wave Sent from my iPad > On Jan 24, 2020, at 2:38 PM, Richard (Rick) Karlquist > wrote: > > On 1/24/2020 10:21 AM, Ron AE5E via Topband wrote: >> I think a good share of noise on 160 for me is coming in on the power line. >> The ground mounted transformer is about 1000' feet away and serves other >> homes as well as mine. The lines are all buried. Where it entered the >> house I would like to try to suppress noise. >> I can turn off all lights, appliances, furnace, pumps, etc but the noise is >> still significant. If I drop the main breaker it is gone. So that is why >> it seems to me it is on the line when it enters the house. >> So thinking a 200 amp low pass filer before the breaker box might the a >> solution. Maybe it just needs to be bypassed with capacitors, I am only >> speculating so far. >> So lets hear if from Topband guys who have figured this out! >> Ron, AE5E >> _ > > I suspect you still have something energized in your > house. Try this: turn the main breaker off and then > hold a pocket AM radio next to the energized mains > listening for noise and then compare to the "de-energized" > lines in your house. I am thinking you will hear > no noise in either case. If your theory was correct, > you would hear noise on the mains coming in and > nothing on the house wiring. > > In any event, a 200A RFI filter is a non-starter. > > If the noise is somehow on the mains coming in, you > need to move your antenna away from your house wiring. > Possibly listen on a loop antenna that you can locate > in a corner of your yard, and then orient it to null > the remaining noise. > > Rick N6RK > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: 200 Amp low pass filter for power mains?
On 1/24/2020 10:21 AM, Ron AE5E via Topband wrote: I think a good share of noise on 160 for me is coming in on the power line. The ground mounted transformer is about 1000' feet away and serves other homes as well as mine. The lines are all buried. Where it entered the house I would like to try to suppress noise. I can turn off all lights, appliances, furnace, pumps, etc but the noise is still significant. If I drop the main breaker it is gone. So that is why it seems to me it is on the line when it enters the house. So thinking a 200 amp low pass filer before the breaker box might the a solution. Maybe it just needs to be bypassed with capacitors, I am only speculating so far. So lets hear if from Topband guys who have figured this out! Ron, AE5E _ I suspect you still have something energized in your house. Try this: turn the main breaker off and then hold a pocket AM radio next to the energized mains listening for noise and then compare to the "de-energized" lines in your house. I am thinking you will hear no noise in either case. If your theory was correct, you would hear noise on the mains coming in and nothing on the house wiring. In any event, a 200A RFI filter is a non-starter. If the noise is somehow on the mains coming in, you need to move your antenna away from your house wiring. Possibly listen on a loop antenna that you can locate in a corner of your yard, and then orient it to null the remaining noise. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Topband: 200 Amp low pass filter for power mains?
I think a good share of noise on 160 for me is coming in on the power line. The ground mounted transformer is about 1000' feet away and serves other homes as well as mine. The lines are all buried. Where it entered the house I would like to try to suppress noise. I can turn off all lights, appliances, furnace, pumps, etc but the noise is still significant. If I drop the main breaker it is gone. So that is why it seems to me it is on the line when it enters the house. So thinking a 200 amp low pass filer before the breaker box might the a solution. Maybe it just needs to be bypassed with capacitors, I am only speculating so far. So lets hear if from Topband guys who have figured this out! Ron, AE5E _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
