Dear LF,

 

The mystery signal starts at 12 kHz, and sweeps up to 23 kHz over a period of a few hours, which is nearly an octave. What sort of antenna system would be in use to allow that sort of frequency coverage? There must have been a lot of variometer twiddling and tap-changing going on!

 

73, Dave G3WCB IO91RM

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Markus Vester
Sent: 28 June 2010 12:30
To: [email protected]
Subject: Re: VLF: Strong drifting carrier on VLF!

this is curious... wish I was at home and could attempt to get a bearing. Paul's http://abelian.org/vlf/spectrum.shtml has directional loop spectra but unfortunately it hasn't updated since Jun 24. During the unid test transmissions, there were / are irregularities in the four-hourly schedule of JXN 16.4 kHz, but this may be coincidence.

 

Best 73,

Markus

 

-----Ursprüngliche Mitteilung-----
Von: pws <[email protected]>
An: [email protected]
Verschickt: Mo., 28. Jun. 2010, 12:45
Thema: Re: VLF: Strong drifting carrier on VLF!

Hi,

Stefan wrote:

> ...Currently there is a very strong (abt 30 dB S/N) drifting carrier that 
started about 7:30 UTC on abt 12 kHz and is moving now up on 14 kHz...

... and further up. Visible also at North Germany on all my
VLF/LF-monitors. That's one of those rare "staircases" which have been
observed up to 30 kHz in the past. Cannot do some RDF from where I am now.

73 from Kiel,
Peter