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 Getting noise on all channels

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Chefsdead
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PostSubject: Getting noise on all channels   Getting noise on all channels Icon_minitimeThu Mar 04, 2021 4:38 pm

This started on Tue from 4pm i get 7lb of hiss and it lasts till 9am i the same on all channels and modes is there anything i can use to cut the noise down.

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Red Fox
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitimeThu Mar 04, 2021 6:25 pm

Michael,

I'm with Martin on this one, unless you can find out if the noise is Man Made or Atmospheric, you would be ??????? against the peverbal wind.

From your brief description, it does sound like something that is on a timer or possibly photocell, i.e. dusk til dawn light? possibly street lighting?

If you have the option of powering your kit with a battery and switching off your electric at the mains, you would at least determine if it is coming from something in your own property / garden.

If it does turn out to be a neighbours dusk til dawn light, I would suggest a handy half brick  Wink Wink Wink

Only joking of course.

Good luck with your efforts.

Graeme.

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Seasick
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitimeThu Mar 04, 2021 6:47 pm

First, what band/frequency is this on? In other words, do you know if this is broadband, confined to  a narrow band, or if it has any pattern to what frequencies it is on. It is best to know your enemy. 


Back when I was licenced, the first thing I would do is remove the antenna. Can you still hear the noise? If you can then it is coming in via the mains, not the antenna. If the noise disappears when the antenna is disconnected, then you know it is entering that way. 

Next I would get a small AM radio, tune it between channels & see if you can hear the noise on that. Am is best for noise finding & a small portable radio allows you to go out hunting. If your radio covers the effected band,  then all the better. But sometimes a MW RX, is all that is required. 

If you can hear the noise on your radio, then take a walk around your own home & your local area. Some man made noises can travel long distances & could come from anything that is electrical, even a few streets or more away.  

Things that could be on over night most, or every night, includes battery chargers & with everything from scooters, to bicycles & cars being electric now, they are every where. Street lights are on every night. Bulbs, as I understand it, are now more likely to cause problems. So think porch lights, security systems etc too.
The list goes on. 


If you cannot here the noise on your AM radio. Your next step is to switch your mains electricity off, remove all your fuses to isolate your house from the mains & then see if you can hear the noise when your radio is connected to a battery. You would be surprised how much noise comes from within our own homes. 

If the noise is outside of your home & not coming in via the mains. Then you will have to find a RX, that will pick up the noise on frequencies you are hearing them on & then go for a walk. 

A scanner or a portable Short Wave radio, will find most noise sources. A scanner can have it's antenna removed to attenuate the signal & the base of a scanner will also null the signal & act as a crude DF tool. With a SW radio, you will have to experiment to get the best from it.

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Chefsdead
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitimeThu Mar 04, 2021 10:06 pm

Seasick it from 26.065-28.305 7lb straight through i have taken the antenna out from back of radio and i get no noise.

Its not a PLT noise no crackling just a hissing sound its not the street lights as i would have had it before.
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Seasick
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitimeThu Mar 04, 2021 10:32 pm

Chefsdead wrote:
Its not a PLT noise no crackling just a hissing sound its not the street lights as i would have had it before.


When it comes to interference there is something called the rusty bolt syndrome. Metals of dissimilar types can create problems when a rusty bolt is involved. What causes interference to suddenly  pop up, is not always something new. Bulbs & other components deteriorate with age. Maintenance is done & parts  are replaced. Any number of things can cause interference. 

I once spent some time helping a friend track down some interference & it turned out to be the light in a fish tank in a Chinese takeaway over the road. We brought them a new light bulb & the problem vanished. 

I also knew someone who lived in the middle of no where, but he used to get random bouts of airborne interference at various times. It took him months to track it down. It turned out to be an insulator on a telegraph pole mounted transformer, 2 fields away, that transmitted unwanted noise when it rained. But only when it rained beyond a certain amount. 

Do you have something like a shortwave radio or a scanner that covers any of the given spectrum, that you take a walk with to track down the source with?

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Chefsdead
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitimeFri Mar 05, 2021 7:51 am

I'll sort video out later
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PostSubject: Re: Getting noise on all channels   Getting noise on all channels Icon_minitime

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