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Re: LF: RFI noise at 144 kHz exactly

To: <[email protected]>
Subject: Re: LF: RFI noise at 144 kHz exactly
From: "Alan Melia" <[email protected]>
Date: Mon, 28 Nov 2016 11:44:56 -0000
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Hi John yes there are Mil stations that come up sporadically with RTTY or GMSK. They are fairly narrow < 100Hz but the splurge that Chris reported seemed much wider....more like interference than a genuine signal.

Alan

----- Original Message ----- From: "John Rabson" <[email protected]>
To: "John Rabson" <[email protected]>
Cc: <[email protected]>
Sent: Monday, November 28, 2016 10:52 AM
Subject: Re: LF: RFI noise at 144 kHz exactly


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 <[email protected]> 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 <[email protected]> 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:[email protected]

My        part        time        LF        grabber       is       at
http://www.chriswilson.tv/grabber.html



[email protected]

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





[email protected]

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






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