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Way to reduce static noise etc on 27mhz
Topic Started: Tuesday, 5. May 2015, 21:38 (3,110 Views)
RS1000
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163 Charlie Tango 077

I am quite new to 27mhz was only a few years old in the 80s so missed the crazy of it any way now using a outdoor antenna over my attic antenna any tips on reducing noise and static etc as i seem to pick up all sorts of out sounds even hear data transmissions now and then :doh2: ,

What about any type of filters or even running off a leisure battery etc :RTFM: ?

Any advise is appreciated,
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You don't mention aerial type or conditions.

Move to a rural location.

Mount the aerial well away from the house.

Earth the aerial if necessary.

If it has to be on the house, up and away from it.

Decent quality coax with good shielding.

Linear power supply, not switch mode.

If you're getting RF back in the shack, a choke or line isolator, should also reduce noise.

Go mobile.

That'll do to be going on with.
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RS1000
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163 Charlie Tango 077

This is home base outdoor semi rural location 1/2 wave antenna,
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RS1000
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163 Charlie Tango 077

RS1000
Wednesday, 6. May 2015, 07:19
This is home base outdoor semi rural location 1/2 wave antenna,
Aerial is now mounted away from the home btw any advise on earthing it size of earthrod and thinkness of earth cable needed etc
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Nik Gnashers
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26 Charlie Tango 573

RS1000
Wednesday, 6. May 2015, 07:21
RS1000
Wednesday, 6. May 2015, 07:19
This is home base outdoor semi rural location 1/2 wave antenna,
Aerial is now mounted away from the home btw any advise on earthing it size of earthrod and thinkness of earth cable needed etc
A 4 foot copper earth rod, hammered in as far as you can, and use as thick a copper wire as you can to connect them. Keeping the earth wire as short as possible too will help.
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I really feel for people, I parked at a spot that I thought was going to be quiet Saturday (before giving myself a massive puncture through side wall of tyre) and it was unbelieveble. Kllrrrrrrr-rat a tatatatatatatatatatatatataatta. PLT seems to be everywhere unless you really move away from houses and power lines. Even in semi rural places. Pretty sure it also comes down those smaller country lane power cables at times throwing out electromagnetic junk for 100m around them.

I hate to say it but going mobile might be the sole way of getting that ear fatiguing racket to quiet down.

Do know where your incoming and out coming drain pipes are before pounding a rod into the earth. Fingers crossed that the earthing helps, though I am not sure how exactly it would. If the antenna is picking up RF junk it still will be even if it is earthed. I would like to understand more about the principle of earthing relative to RX interference. I thought it was mainly as a safety mechanism against lightening strikes. An example is I had a silver rod on a gate that must of been the best earthing possible with 2 massive iron gate posts in the ground. Every time a car came past I got a clicking from the engine ignition (from slight to 30+ blocked out crackling). The worst by far was an old 1930's classic car (obviously with zero suppression) I could hear it coming down the road on the radio 300m away before I could see the car!!!!

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It's mainly the Yanks that go on about grounding because of lightning. All though I do know someone, who only last week, disconnected his antenna because of lightning and then reconnected it without grounding it first. His RX only works now, if he puts on the IPO and bypasses the pre-amp.

An RF is meant to let static drain away. The trouble is, it goes back to the days of when houses didn't provide much interference, unlike now, so it has become pretty much redundant. You can't put an RF earth away from the house like you can with an antenna, because the connection to it has to be kept relatively short.

Put it near the house and you just end up picking up all the crud. Somewhere in the back of my mind, I seem to remember that some home earthing systems cause problems, because you get a potential difference between your RF earth and the power supply earth.
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Roy
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104 Charlie Tango 011

RadioDaze
Monday, 11. May 2015, 08:28
I really feel for people, I parked at a spot that I thought was going to be quiet Saturday (before giving myself a massive puncture through side wall of tyre) and it was unbelieveble. Kllrrrrrrr-rat a tatatatatatatatatatatatataatta. PLT seems to be everywhere unless you really move away from houses and power lines. Even in semi rural places. Pretty sure it also comes down those smaller country lane power cables at times throwing out electromagnetic junk for 100m around them.

I hate to say it but going mobile might be the sole way of getting that ear fatiguing racket to quiet down.

Do know where your incoming and out coming drain pipes are before pounding a rod into the earth. Fingers crossed that the earthing helps, though I am not sure how exactly it would. If the antenna is picking up RF junk it still will be even if it is earthed. I would like to understand more about the principle of earthing relative to RX interference. I thought it was mainly as a safety mechanism against lightening strikes. An example is I had a silver rod on a gate that must of been the best earthing possible with 2 massive iron gate posts in the ground. Every time a car came past I got a clicking from the engine ignition (from slight to 30+ blocked out crackling). The worst by far was an old 1930's classic car (obviously with zero suppression) I could hear it coming down the road on the radio 300m away before I could see the car!!!!

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Hi Geoff / All

I'm inclined to agree with you regarding earthing not being able to prevent your antenna from picking up crap, with all of the modern day crap that is floating around in the airwaves it seems that that if you live in a built up area its becoming almost impossible to enjoy noise free reception.

Earthing to me is more of a means of preventing stray RF from YOUR station causing problems to neighbours etc, for example a friend of mine was causing QRM on his baby alarm and I suggested that as he had no earthing at all in his radio shack that he should try some decent earthing ( I also recommended that he make himself an ugly balun )

Well I'm pleased to say that this cured his problem with his baby alarm.... was it the earthing or the ugly balun that made the difference, or perhaps a bit of both ? the main thing is that it cured my friends problem.

But I cannot see where earthing would remove unwanted "signals" from entering your transceiver via your antenna.... just my humble opinion.
Roy 104DA101 & 104ET001 + 104CT011
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Nubster
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26 Charlie Tango 050

Ditto in what Al (RoadHog) said , the thing is people still don't believe it when you tell them , and then just earth everything that moves or breaths and still then wonder why they still get it :shrug: it all boils down to the modern technology that's plagues us now
Edited by Nubster, Monday, 11. May 2015, 10:51.

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cj/ct331
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a dipole horizontal / vert 9x9 will cure it,, vert seems more prone to noise,,some stns use loop on rx and tx vert and just about get away with the dreaded noise knocking out there rx, the best coax you can bye is advisable rg mini 8 or rg213 ? but if you are on a mobile rig a big home base Arial will over load it, they are not designed for that,, new radios are poorly made and cheap ,,,most qrn is on the braid , easy test just leave the center of plug in while in rx you will see the noise drop add the outer back on and noise back up again,,,, :shrug: baluns/ chokes xtra earthing might help but very doubtful ,,,,
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SleepyDragon
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26 Charlie Tango 1094

I get a lot of static from my TVs, turning them off works a treat
[marq=Proud to be running 100% legal, unmodified radios on standard power.]Proud to be running 100% legal, unmodified radios on standard power.[/marq]

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Scruff
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26 Charlie Tango 839

Road_Hog
Monday, 11. May 2015, 09:23
<snip>

Put it near the house and you just end up picking up all the crud. Somewhere in the back of my mind, I seem to remember that some home earthing systems cause problems, because you get a potential difference between your RF earth and the power supply earth.

If it says the letters PME on your meter then not a good idea to run a seperate earth without taking proffesional advice 1st.
Like most I just accept noise as part of modern living, my neighbours lg tv is a piece of junk that gives me s9+ but luckily they don't watch much tv.
I have an 8 foot earth rod in the garden because after my wifes foundation course last year she kept going on about it and it has made no difference at all.
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Nubster
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26 Charlie Tango 050

Natural static aint the problem, like what Richard (Scruff) said it all the modern technology that we are plagued with is the problem get rid of that or find something that can and things would OK, also PLT we should be complaining about that but as CB Radio is not a licensed thing like Amateur Radio is it does'nt concern OFCOM to do anything about for CB only for Amateur Radio it does, but we should all be campaigning about Anti PLT devises to be got rid of
its no use keep on buying different antennas and all the other things people keep on buying thinking its gonna work cos it dont, and why should we have to go and sit in a field some where in a car to get away from it when I want to stay at my house comfy home base like I have had for years, plus some of us cant as we live in the center of a City (me London ) and we aint got no high hills any country side really to go to , I never had any problems with any noise or interference when I first moved to my house 18 year ago in the past 7 year its got worse and worse , never had any in the old pre legal CB AM days then again we didnt have the tech we have now
Edited by Nubster, Sunday, 7. June 2015, 10:29.

Life is too short, so ave a laugh now n then never know you might like it
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Nubster
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26 Charlie Tango 050

Here is a couple of examples of interference we get in London (well my area ) PLT/modern technology causing it take ya pick which one of them it is , but its defiantly not natural static LOL
https://youtu.be/FZKxNAxD4h0 this was from 2012

and this one 2015 https://youtu.be/Vm0UQkQDtK8 this one gets louder on certain days

I could'nt be bothered to vid all of the noises I get I'd end up owning youtube with the amount I get LOL
Edited by Nubster, Sunday, 7. June 2015, 10:46.

Life is too short, so ave a laugh now n then never know you might like it
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ph62
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13 Charlie Tango 777

For home use, a device like this could help - it receives the static on a second "antenna" (a wire will already do) and eliminates it by adding it phase-inverted to the antenna signal:

http://www.pmr-funkgeraete.de/Funkgeraete/Zubehoer-CB/AFU/Entstoerung/QRM-Eliminator-Wimo::9289.html
"The problem with quotes from the internet is that you can't trust them."
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SleepyDragon
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26 Charlie Tango 1094

here's an example of my TV interference https://youtu.be/NYIcomJVkT8

here is another noise blanking device http://www.ebay.co.uk/itm/MFJ-1026-DELUXE-NOISE-CANCELLER-HAM-RADIO-/131494279404?pt=LH_DefaultDomain_3&hash=item1e9dab78ec

Edited by SleepyDragon, Wednesday, 17. June 2015, 23:52.
[marq=Proud to be running 100% legal, unmodified radios on standard power.]Proud to be running 100% legal, unmodified radios on standard power.[/marq]

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Nubster
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26 Charlie Tango 050

SleepyDragon
Wednesday, 17. June 2015, 23:37
I just look at your video Christopher I did notice it was about 3 year old so hopefully by now you have got it sorted , I can also sympathize with your problem as I get the same interference now and then from different things around me (not from in my own home I checked) its the modern world we live in now so we have to put up with it as such , never had it back in the 70's in pre legal CB days it was the other way round back then we allegedly interfered with everything :$ , I'll be honest I could'nt really tell the difference on the noise cos TBH FM sounds like a load of hash and interference to me anyway I normally hear mine when on SSB or AM but anyway hope its been sorted now for you, just one more thing on your youtube channel on the comments a poster called rpcomms posted , he gave you the best advise/info out of all of them plus I can vouch for him as I have dealt with him, his name is Rob and he owns his own communication repair company and he knows what he is on about :thumb:

as for that MFJ-1026-DELUXE-NOISE-CANCELLER I have read a couple of people who have bought one of those and TBH said it made the interference worse :shrug: so TBH spending £200 on somthing that might not work I would sooner take Robs advise on the ferrite clips/rings there alot cheaper
Edited by Nubster, Thursday, 18. June 2015, 07:57.

Life is too short, so ave a laugh now n then never know you might like it
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I've said it before and I'll say it again. I find ferrite rings are a whole waste of time and are totally ineffective. I don't care that your old G3 club instructor swears by his life on them. They don't work, QED.

Those noise cancellers, from what I remember, they do work, at least for some. I'm getting forgetful in my old age, but I seem to remember that they work off, a small aerial, and they try to receive the signal, so it takes it away from your receiver.

The bottom line is, you need to get your aerial away from the noise, get it off the house and down the garden. The lower frequency bands are quite noisy, but up on 11m is actually quite quiet. I get zero bars on T5, not a lazy needle, I find it is quite often ended (pushed all the way to right) by some in the evening on 80m, but they are running 400w.

I can listen to Continental QSOs, where they don't move my meter at all, I can hear their audio, but a signal report would be 5&0.
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Nubster
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26 Charlie Tango 050

Al , sensible question now please not a dig or anything mate , can you answer me this , OK yes ferrite's dont seem to work if put on any part of the radio equipment well they dont for me , but when I fitted one to some speakers on my computer they stopped the interference and my voice coming through them when I was using my radio also the same when fitted some to my sons speaker box what was fitted to there Xbox 360, so in my mined they do work for some things, also you say get the antenna down the garden away from the house , what happens if you cant or have'nt got a garden or even a small garden , and what about people who live in flats who have no other choice than either put it on the building or there balcany


Oh also I aint got a old G3 club instructor either :D
Edited by Nubster, Thursday, 18. June 2015, 10:34.

Life is too short, so ave a laugh now n then never know you might like it
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Okay Martin, Yes, I can be a piss taking git, but you'll know if I'm being serious, 'cause a ban will probably come my way.


Ferrites will work for some, but I don't like them, they don't do anything for me. Where as the current balun/line isolator I have, works a treat, as soon as I leave it out, people comment on RF in my audio.

As for small gardens, well you live in London, I did for 27 years. And the saying is, tough titty, it ain't good, I wouldn't want to live in London any more.
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