Re: LF: Re: LF interference

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hi Gary,

What type of RX antenna are you using? Is it passive or active?

73, Stefan/DK7FC

Am 27.11.2012 21:56, schrieb Gary - G4WGT:

Hi All,

 

The interference has just stopped as suddenly as it started.

 

https://www.dropbox.com/s/zz8fgh0hr79ytr8/137700Hz-1211272049.jpg

 

73,

 

Gary - G4WGT.

 

----- Original Message -----

From: Gary - G4WGT

To: LF Group ; rsgb_lf_group@yahoogroups.co.uk

Sent: Tuesday, November 27, 2012 8:41 PM

Subject: LF: LF interference

Hi All,

 

For about 7 days or so I have been getting some very strong interference on the 136kHz band. At first it only came on for short periods (up to 1 or 2 hours) but from yesterday it came on early evening & stayed until early today & is there again tonight.

 

The interfering signal sounds like a buzzing noise on my LF Rx & the visual display shows a very unstable form. It starts from about 137.000kHz upwards & fades towards 145kHz.

 

I have placed 3 captures on Dropbox, 2 SpecLab (showing the start time) & 1 HDSDR showing the extent of the interference.

 

https://www.dropbox.com/s/fhx3daelhpf9mn5/137700Hz-1211262130.jpg

https://www.dropbox.com/s/ip7s3gdnn8uyned/137700Hz-1211271830.jpg

https://www.dropbox.com/s/r51adwp0avx75x0/HDSDR%20Waterfall.jpg

 

If anyone can identify this type of interference I would be pleased for comments. I believe I have eliminated all my own gear & household items.

 

Thanks & 73,

 

Gary - G4WGT.