Message-ID: <20081103155036.cr2fpbsbr3kscsgs@webmail4.kuleuven.be>
Date: Mon, 03 Nov 2008 15:50:36 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: rsgb_lf_group@blacksheep.org
References: <689621.83068.qm@web28101.mail.ukl.yahoo.com>
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Hello Pete,

I found out that 90% of the noise on 500kHz came from inside my own house.
A lot of electronics is running of switched PSU's and you need just =20
one of these oscillating near 500 kHz to get a lot of noise.
I took a small portable AM radio (tuned to the lowest end of the =20
medium wave band =3D abt. 520kHz) to locate the noise sources. Use the =20
ferrite antenna to take null bearings.
After replacing a couple of 12V switched PSU's by good old linear ones =20
noise was down by 10's of dB.
Another source of noise are energy saving lamps. You can locate them =20
the same way.

73, Rik  ON7YD - OR7T


Quoting M0FMT <m0fmt@yahoo.co.uk>:

> Hi Mal and LF
> =C2=A0
> I would like to be on for two way QSO's however its the old story  =20
> here I have a high noise level and am not hearing any thing other  =20
> than local signals.
> =C2=A0
> I was on the Suffolk coast for this years holiday. I only had a  =20
> Kenwood TS50 and a 40 metre dipole up. I was hearing just about  =20
> every thing=C2=A0on 500kc/s. Its not as though I live in a high density  =20
> area apart from a neighbour either side the nearest other is about  =20
> 1/4mile away but I do have 11kV at the bottom of the garden which to =20
>  date has not been a problem. So I suspect an insulator but the =20
> noise  is not general it is not affecting HF at the moment.
> =C2=A0
> I have an 8 foot Octagon tuneable and rotatable loop that I am  =20
> playing with at the moment=C2=A0but so far no real improvement.
> =C2=A0
> Sorry for the tale of woe but we are working on the problem.
> =C2=A0
> Chris XIZ has suggested X band so I may try that shortly.
> =C2=A0
> 73 petefmt
> =C2=A0
>
> --- On Mon, 3/11/08, mal hamilton <g3kevmal@talktalk.net> wrote:
>
> From: mal hamilton <g3kevmal@talktalk.net>
> Subject: Re: LF: 500
> To: rsgb_lf_group@blacksheep.org
> Date: Monday, 3 November, 2008, 11:32 AM
>
>
> =EF=BB=BF
>
>
> Peter
> Listening on 500 recently it looks like the GAS has gone out.
> Mal/g3kev
> =C2=A0
>
> ----- Original Message -----
> From: M0FMT
> To: rsgb_lf_group@blacksheep.org
> Sent: Monday, November 03, 2008 11:10 AM
> Subject: Re: LF: 500
>
>
>
>
>
>
> =C2=A0
> =C2=A0
> Nice one Warren .... :))
> =C2=A0
> Sorry Mal.
> =C2=A0
> 73 Petefmt
>
> --- On Sat, 1/11/08, Warren Ziegler <wd2xgj@gmail.com> wrote:
>
> From: Warren Ziegler <wd2xgj@gmail.com>
> Subject: Re: LF: 500
> To: rsgb_lf_group@blacksheep.org
> Date: Saturday, 1 November, 2008, 7:24 PM
>
> Mal,
>      You have a gas powered TX?
> 73 K2ORS
>
>
> On Sat, Nov 1, 2008 at 2:55 PM, mal hamilton <g3kevmal@talktalk.net>
> wrote:
>> Hi
>> Is there anyone listening on 500 ? or am I just burning up gas !! now CQ
> for
>> a qso on 502.6
>> de g3kev
>>
>>
>
>
>
> --
> 73 Warren K2ORS
>                 WD2XGJ
>                 WD2XSH/23
>                 WE2XEB/2
>                 WE2XGR/1
>
>
>
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.175 / Virus Database: 270.8.5/1763 - Release Date:  =20
> 11/2/2008 7:08 PM
>
>
>
>



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