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 weird noise on all hf bands 
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Post weird noise on all hf bands
Hi folks this is causing my add for full set up for sale the noise is like static but with a sort of clicking sound in it i have tried an end fed wire with 9.1 unun 80m to 10m ocf dipole both are s9 or above the sound comes and goes every few minutes the only antenna that is not affected is a sirio vertical for 26.4 mhz to 28mhz people always say verticals cause more noise in this case it semms thats wrong, ps i have tried turning the power of around the house no change even useing a car battery dose not help :banghead: :banghead: :banghead:


Mon Feb 03, 2020 11:34 pm
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
Have you tried a different receiver to rule out a fault in your rig?

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Mon Feb 03, 2020 11:53 pm
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
An end fed 9-1 is possibly the worst antenna you could try in a noisy location mate, don't sell up but try some options.
A loop would be better maybe a noise canceller like a X phase....magnetic loop....a balanced diople....loads of options to try.
Where is the noise coming from?


Mon Feb 03, 2020 11:56 pm
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
End fed 9:1 here is S9 noise below 14Mhz, try folded dipole or loop configs.

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Tue Feb 04, 2020 12:14 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
thanks for the replies i should have said the noise has just started recently i live in the countryside no street lights etc just 1 house next door and the farm 500 odd yards away next door is always out in the day time i do have one phone line crossing from one side of the road to the other at the end of the garden this is the first noise in over three years living here


Tue Feb 04, 2020 7:21 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
You need walk around the hood and track it down, any specific questionsbands?
If it's on the phone line move all antennas away and beams will help because you can point away from the noise so it's at the side or back.
Early days track it down and what bands are affected, is their a sub station near?
Is it on 24/7.


Tue Feb 04, 2020 7:30 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
I'm just wondering if it's static buildup on the antenna, is it raining heavily at the time? This can happen if there is no DC path to earth, the vertical might not be affected because there might be a path to earth.

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Tue Feb 04, 2020 7:33 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
Hi Mark the wire antennas i tried were ends pointing north to south phone line ends east to west as for the bands 160 to 10


Tue Feb 04, 2020 7:48 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
Hi Paul it has been raining a lot but not all the time the vertical in on a 10ft pole that is touching the ground i did have the end fed grounded


Tue Feb 04, 2020 7:53 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
You need walk around the hood and track it down, any specific bands?
If it's on the phone line move all antennas away and beams will help because you can point away from the noise so it's at the side or back.
Early days track it down and what bands are affected, is their a sub station near?
Is it on 24/7.


Tue Feb 04, 2020 7:57 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
Is it possible the farmer recently installed an electric fence?

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Tue Feb 04, 2020 8:03 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
One way to prove it isn't static buildup is to simply connect a 5 megohm resistor from the antenna to ground and see if the cures it. It only needs to be raining within a few miles for static to build up. I have suffered with the problem a few times over the years till I add a resistor as a matter of routine now to all my aerials.

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Tue Feb 04, 2020 8:05 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
no electric fence fields are crop only no animals


Tue Feb 04, 2020 8:08 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
mm0hgn wrote:
no electric fence fields are crop only no animals


Rig up a temporary wire monoband dipole and give it a try, even if it’s only slung up low.
16’ 6” wire cut in half for 10m will do.

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Tue Feb 04, 2020 8:16 am
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 weird noise on all hf bands 
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Post Re: weird noise on all hf bands
Don't write off verticals they can work really well ground-mounted out in the countryside, used several here very successfully . I gave up on end-fed wires years ago, just too much noise: verticals for the lower bands and resonant horizontal aerials for the higher bands.

RF noise in the countryside has been increasing. When I moved here it was really quiet on the bands, 15 years later there's a load of noise and I have no immediate neighbours.


Tue Feb 04, 2020 10:56 am
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