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HI, My neighbours are complaining about the interference my drill is causing to their tv, radio etc. What is causing the problem and how do I combat it?

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Check the power cable of the drill is it a 2 prong or 3 prong plug? if it's a 2 prong it is an insulated power tool it is prone to emitt EMI (Electro Magnetic Interferance) becaus the casing is usually plastic, what could be done is check the carbon brushes inside the drill they could be worn and produce a lot of blue sparks, replace the brushes, if it's a 3 prong check for a faulty ground, with a faulty ground the metal casing of the drill is not shealding the EMI and could be deadly for the user in the event of a faulty live wire touching the casing

If all is well for the drill, contact a qualified electrician and ask for a EMI filter you could ave installed in the electric panel

Good luck!

Posted on Dec 31, 2010


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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Tv has a pink/magenta shimmering when the tv screen has a light coloured backgroung

Shimmering can be caused by a number of things.

The first that springs to mind is electromagnetic interference. Speakers, amplifiers, florescent lights in close proximity can cause this. I even saw a TV that had been fixed to a wall adjoining the next door neighbours who had put his TV in exactly the same position and the interference passed through the wall.
Try moving the TV location away from all sources of interference (including Cable boxes, Video recorders, etc.) Does the problem change or go away?
Is the TV grounded properly? Interference needs to be siphoned off to a ground. if you put your hand around the cable that feeds the TV a video signal does the problem change or reduce?

Another issue may be some form of video post-processing going on causing the shimmering. Some forms of image smoothing software built into the TV can cause this. So try shutting down any features on the TV, does the problem go away?

On a big TV that is fed a low resolution video stream you will always see what the industry calls "artefacts". These are distortions caused by the transport compression of the video signal. there is no way around these except for receiving a better resolution picture stream.

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I keep on loosing BT phone and broadband connection very intermittent service.This has been going on for over a month.I have complained sat26th Oct 9.10am spoke to Ram. Then again Sunday 2nd November at...

Sorry , no we can't sort it out .
Suggest considering radio coverage where you and you neighbour's house if located .
You may have either something blocking the radio signal from bt network like a hill or you are in a valley and the radio is not penetrating into the valley .
Or you are out of the coverage range.
What your building is made of could be a cause if the building is metal without a window of the side that the radio signal comes from it won't go through metal as it acts as a faraday shield to the radio.
suggest finding out if you are in a coverage area for BT radio network and where the radio towers are located from your house and if they are in line of sight with your phone.

Another cause could be interference from adjoining radio cells or even if you are near water the radio from a different cell could be travelling across the water and interferring with your coverage.

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The time is the clue static in the background is electrical interference this can be caused by faulty electrical appliances UHF ham and CB Radios etc ask neighbours if and when they suffer this interference this will help to locate and identify the cause ie the closer you get the worse it'll be
Once you identify the source the culprit may decide to fix the appliance desist from operation or you can buy filters to eliminate the cause of static noise once you know the cause

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Any one good with TVI problems neighbor is gripeing about my 15 watt two meter beacon that operates at 144.288.000 I have no TVI in my home but as he puts it its so bad he is willing to have my license...

Hi Ted,

First of all - the FCC will not take your license nor tell you to stop transmitting from your properly operating and licensed station with a radio that hasn't been modified and is "Type Accepted" (your Kenwood TS-2000 is Type Accepted right out of the box). It is up to your neighbor to resolve the problem. Television sets typically state to the effect that they "must not create harmful interference and must accept any interference". The fact is, if his TV was interfering with YOUR ham station; HE has to fix it or stop using it! This is no different if a local AM radio station's signal was interfering with his TV. Assuming there is no malfunction with the transmitter equipment, the broadcaster is within their rights to operate on the frequency at the power level they are using - just like you are. The AM broadcaster can basically tell the complainer "tough luck - take it up with the FCC" and you can too. It is up to him to solve the problem - but as a good neighbor, you can help him do this if you wish.

Regardless, you should make sure that your 2M antenna feedline and antenna are in good working condition with solid mechanical and electrical connections. Make sure that your antenna support is well grounded. Also, check and adjust your antenna for the lowest possible SWR for 144.288Mhz.

TVI can be the result of the "front end" of his TV is being overloaded by your transmitter. It is the design of the TV reciever that helps the TV capture very low power signals from distance stations, but also makes it much more susceptible to interference from low power non-TV signals that are close by.

Other TV manufacturers do a better job of it and that's why you don't see it on your TV and why other neighbors don't either. Ask him if he has problems on any other TV. If he doesn't, then you know it's an issue with his TV (which you know already becuase your TV is fine). Even if he does, I'd show him your TV and let him see that you're not doing anything special to your TV and there's nothing wrong with your beacon.

You should have him see if the signal is present on his TV with the antenna disconnected and with the antenna terminal shorted (if possible). If it goes away, you might be able to have him instal a "High Pass Filter" between his antenna feed line and the antenna terminal of the TV.

If the signal is present with antenna removed / shorted, the signal may be coming in on the wiring in the home that brings the power to the TV. There may be little to do to fix this problem unfortunately.

Good luck!

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1 Answer

We have analog tv and freeview box but arial is in loft. signal strength is 70 percent and is good most of time.have found bad breakup when running 3kw shower and 3kw kettle, no other apliances interfere,...

The problem with inside aerilas is the signal strength of 70% contains noise as well. You could try using a higher gain aerial and the interference will be limited with a better signal.
Any electrical items can interfere with a poor signal.

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1 Answer

Causes interference with radio, tv

You could possibly add a metal shield around the electronics in the dishwasher and ground the shield with a wire to the dishwasher chasis. Don't know if this would reduce the EMR enough to stop the interference with the radio, but there's a chance it would.

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question is are you running a pc and router/ modem on the same land line
if so you will need the line filters to the phone base
the computer data is transferred by the same land line and there is every possibility that the different frequencies is what is causing the static
reference from a uniden trouble shooter ( will be common as the phones use the same medium)
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move the handset base away from the source
if you have any device that uses the phone line , add a DSL or telephone line filter to the system

it is possible from the times you state that the interference could be coming form a neighbour or further down the line so the filter may be the option
available from phone shops or places like JAYCAR

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an easy first step is to check and make sure that you don't have any other rf interference. make sure that all radios, laptops, pcs, routers, etc.. .are not nearby. they can cause interference. A second idea requires knowing how you have it connected and what other types of equipment you have connected to the tv itself

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