[Lowfer] Something on 133.185 kHz ?

[Clive Carver]

I live in Hawarden, north Wales, UK and I too am receiving an unexpected
transmission around 135 to 140 kHz. To me it looks like the product of a
switch mode power supply.

To compare, I have put some screen shots, ScreenShot 3289.bmp to
ScreenShot3295.bmp and also four SpectraVue recordings starting:
Record0_20190120 at www.ancient-mariner.co.uk/public SpectraVue can be
easily found on the web and downloaded. My receiver is an RF-Space SDR-IQ
and a PA0RDT mini-whip antenna.

Other transmissions around there include Teleswitching on129.1 135.6 and
139.9

I have not seen this sort of signal/interference on this part of the
spectrum previously, certainly there below 100 KHz.  I wondered at first
whether it was from a solar panel invertor, but likely not much going on at
midnight...

Hope this helps.

73's

Clive
GW4EYO

  
-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of N1BUG
Sent: 19 January 2019 13:51
To: rsgb_lf_group at blacksheep.org; rsgb-lf-group at groups.io; Discussion of the
Lowfer (US, European, & UK) and MedFer bands
Subject: Re: [Lowfer] Something on 133.185 kHz ?

Thanks to everyone for input on this. It is being heard in North America and
Europe so it is obviously a high powered transmitter.
Probably CFH although the frequency and modulation type is not something I
formerly associated with that station. Anyway it's not some local device
gone crazy, so I don't have to think about finding it. :)

73,
Paul


On 1/17/19 4:57 PM, N1BUG wrote:
> Is anyone else seeing a signal on 133.185 kHz? I thought it was some 
> new kind of local interference but it seems to have some QSB which 
> peaks around sunset and sunrise. It has a 20 Hz pulsing 'modulation'
> and the sidebands extend well past 136.5 kHz. Whatever it is, it is 
> very strong, some 60 dB or more above my noise floor.
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