Anyone know if there are recent noise floor graphs published (like CCIR graphs)
showing how much on average the LF and HF noise floor has rises in urban and
semi-urban areas?
Here, on the edge of a village, I estimate 160 and 80m noise has risen 20dB
over the last 10 years. I have been lucky on 136/500kHz so far.
73
Roger G3XBM
Via my iPod Touch 4g 2.4GHz handheld.
On 14 Jul 2011, at 00:57, "Graham" <[email protected]> wrote:
> Thanks' JIm, will take a look at the links
>
> Well 500 has filled with background noise over the past year , wspr
> decodes had started to drop off , the s-meter on the rx was
> starting to show mid scale , just from background noise .. though
> that could be down to Ae improvement's
>
> Hf has taken quite a hit , the 5 meg nov is virtually useless as is
> most of 160 . as far as I can tell the wide jingling noise is
> caused by a broadband system as there is even more noise just out
> side the HF bands , making any shortwave reception hit and miss
>
> 73 -G..
>
> --------------------------------------------------
> From: "James Moritz" <[email protected]>
> Sent: Wednesday, July 13, 2011 9:42 PM
> To: <[email protected]>
> Subject: LF: Re: UK--OFCOM Interference services ... how to contact ??
>
>>
>>> UK--OFCOM Interference services ... how to contact ??
>>
>> Dear Graham, LF Group,
>>
>> There is an on-line interference report form at:
>> https://stakeholders.ofcom.org.uk/tell-us/abuse-amateur-radio-system
>>
>> There is some advice about completing this form on the RSGB web pages at
>> http://www.rsgb.org/emc/i-am-experiencing-interference.php.
>>
>> You didn't mention on what frequency you are experiencing QRM, but if it is
>> 500kHz, you might be struggling a bit since this is not really an amateur
>> band... with mains-borne noise on 136kHz, there is the problem that most EMC
>> regulation noise limits apply only to 150kHz or above.
>>
>> Cheers, Jim Moritz
>> 73 de M0BMU
>>
>
>
>
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