Message-ID: <583C103E.7000308@lineone.net>
Date: Mon, 28 Nov 2016 11:08:46 +0000
From: LineOne <dhchurch@lineone.net>
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References: <394829979.20161126101755@chriswilson.tv> <6B2EB28C-A17D-484F-A20B-856BFAFCE4B4@gmail.com> <C94DBE0A-0355-4153-A701-1650FF4D9DE3@gmail.com>
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Subject: Re: LF: RFI noise at 144 kHz exactly
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The RTTY on 147.3kHz is usually there, generally nothing else of 
consequence.

73, Hugh, M0DSZ

On 28/11/2016 10:52, John Rabson wrote:
> 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
>
>
>
>
>
>