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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