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From: John Rabson <john.rabson07@gmail.com>
In-Reply-To: <6B2EB28C-A17D-484F-A20B-856BFAFCE4B4@gmail.com>
Date: Mon, 28 Nov 2016 11:52:53 +0100
Cc: rsgb_lf_group@blacksheep.org
Message-Id: <C94DBE0A-0355-4153-A701-1650FF4D9DE3@gmail.com>
References: <394829979.20161126101755@chriswilson.tv> <6B2EB28C-A17D-484F-A20B-856BFAFCE4B4@gmail.com>
To: John Rabson <john.rabson07@gmail.com>
Subject: Re: LF: RFI noise at 144 kHz exactly
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Alan,

Thank you for your suggestions regarding tracking down the QRM, but this morning the signal on 145 kHz is no longer there. What I have noticed is that there is now an RTTY signal on 147 kHz about the same strength here as longwave Radio 4.

I shall continue monitoring while recommissioning my 136 kHz softrock.

John F5VLF
> On 27 Nov 2016, at 11:22, John Rabson <john.rabson07@gmail.com> wrote:
> 
> 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
> 
> 
> 
> 

john.rabson07@gmail.com

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