References: <FF6F8402385E4D7CA2D9E976A80AED57@AGB> <54C269E0F96C4101A75F5A90F969A028@JimPC> <11A08634152043FE81F0DC951D97CA84@AGB>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
In-Reply-To: <11A08634152043FE81F0DC951D97CA84@AGB>
Message-Id: <EA2A13FA-8DBA-440C-AB77-2CBA6EE5DD4B@gmail.com>
Date: Thu, 14 Jul 2011 08:26:37 +0100
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Mime-Version: 1.0 (iPod Mail 8F190)
Subject: Re: LF: Re: UK--OFCOM  Interference  services  ... how  to  contact  ??
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Anyone know if there are recent noise floor graphs published (like CCIR grap=
hs) showing how much on average the LF and HF noise floor has rises in urban=
 and semi-urban areas?=20

Here, on the edge of a village, I estimate 160 and 80m noise has risen 20dB o=
ver the last 10 years. I have been lucky on 136/500kHz so far.=20

73
Roger G3XBM

Via my iPod Touch 4g 2.4GHz handheld.=20

On 14 Jul 2011, at 00:57, "Graham" <g8fzk@g8fzk.fsnet.co.uk> wrote:

> Thanks'   JIm, will  take  a look  at  the links
>=20
> Well   500  has  filled  with  background  noise  over the  past  year , w=
spr  decodes  had  started to  drop  off  , the  s-meter  on the  rx  was st=
arting  to  show  mid  scale  , just  from  background  noise  .. though tha=
t  could  be  down to  Ae  improvement's
>=20
> Hf has taken  quite a  hit , the  5  meg  nov  is  virtually  useless  as i=
s most  of  160  . as  far as  I can  tell  the  wide  jingling  noise  is c=
aused  by  a  broadband  system as  there  is even  more  noise  just  out s=
ide the  HF bands , making  any  shortwave   reception  hit  and miss
>=20
> 73 -G..
>=20
> --------------------------------------------------
> From: "James Moritz" <james.moritz@btopenworld.com>
> Sent: Wednesday, July 13, 2011 9:42 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: LF: Re: UK--OFCOM  Interference  services  ... how  to  contact  ?=
?
>=20
>>=20
>>> UK--OFCOM  Interference  services  ... how  to  contact  ??
>>=20
>> Dear Graham, LF Group,
>>=20
>> There is an on-line interference report form at:
>> https://stakeholders.ofcom.org.uk/tell-us/abuse-amateur-radio-system
>>=20
>> There is some advice about completing this form on the RSGB web pages at h=
ttp://www.rsgb.org/emc/i-am-experiencing-interference.php.
>>=20
>> You didn't mention on what frequency you are experiencing QRM, but if it i=
s 500kHz, you might be struggling a bit since this is not really an amateur b=
and... with mains-borne noise on 136kHz, there is the problem that most EMC r=
egulation noise limits apply only to 150kHz or above.
>>=20
>> Cheers, Jim Moritz
>> 73 de M0BMU
>>=20
>=20
>=20
>=20