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From: John Rabson <john.rabson07@gmail.com>
In-Reply-To: <394829979.20161126101755@chriswilson.tv>
Date: Sun, 27 Nov 2016 11:22:48 +0100
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References: <394829979.20161126101755@chriswilson.tv>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: RFI noise at 144 kHz exactly
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I have just resumed monitoring 135 to 198 kHz and have noticed a fairly strong broad and constant signal on about 145 kHz which was not there last winter. It sounds rather like LORAN A (not C) but without the selective fading effects we used to get on 1.9 MHz. It appears to come from either north-east or south-west of my location in central Burgundy, but I have not yet managed to get a cross bearing.

John F5VLF

> On 26 Nov 2016, at 11:17, Chris Wilson <chris@chriswilson.tv> wrote:
> 
> 26 November 2016
> 
> 
> I have been monitoring my noise on my receivers and the big issue is a
> constant, day and night, high level noise centred exactly on 144 kHz.
> Is  this  a frequency that is familiar to anyone? Googling it has only
> brought  up  comments  of  some 20kHz solar inverters talking to their
> control  panels  down  the  mains wiring at 144 kHz, with some chatter
> about  inverters  going  noisy  and  blanking  out their own talk back
> frequency.
> 
> My  next  door  but one neighbour has solar panels on his stable roof,
> but  I  don't THINK they have an accumulator bank, they just feed back
> into the national grid. we don't really get on too well so I am loathe
> to approach them unless I can be sure the noise is from there.
> 
> There's also a huge, multi acre solar farm opened about 5 miles away.
> I would imagine some old geezer with noise near his beloved LF Ham
> band frequency would have little impact on its operation, so i hope
> it's not tat. Any ideas on what uses 144 kHz, and how to locate the
> source?
> 
> Here's  a  screen  shot  of  it as it is at the moment, but it doesn't
> change,  day  or  night,  and its amplitiude stays pretty constant, no
> turning  on  and off I have ever seen. My RX is on my TX aerial at the
> moment.
> 
> http://www.chriswilson.tv/noise.jpg
> 
> Thanks
> 
> 
> -- 
> 
> 
> Best regards,
> Chris  2E0ILY                           mailto:chris@chriswilson.tv
> 
> My        part        time        LF        grabber       is       at
> http://www.chriswilson.tv/grabber.html
> 
> 

john.rabson07@gmail.com

Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE