Re: VLF: EbNaut 8270.1, Sunday Feb 28 (carrier)

[Markus Vester <markusvester@aol.com>]

The carrier was on from 9:25 to 12 UT with 0.34 A (13 uW ERP) and continuous phase. This test produced some surprising results: 

As expected, a nice continuous dash appeared on Stefan's city-grabber http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html in the 0.42 mHz window. It is somewhat weaker than that from Friday afternoon, probably due to the midday minimum for our distance.

 

A few bright pixels also showed up on Stefan's new tree-grabber http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html , albeit close to the noise and perhaps disrupted by a phase glitch. If the signal is real, it's a complete surprise as I am due east from Heidelberg and should be exactly in the minimum of the N-S receive loop. One could perhaps speculate about steep skywave and Faraday rotation...

 

On Lubos' grabber http://www.ok2bvg.cz/vlf_grabber/index.html the signal appeared again with excellent SNR up to 20 dB. However although this receiver is usually glitch-free, there seems to be a break in the middle ~ 11 UT which is not visible in Heidelberg.

 

At the same time, Paul's spectrogram http://abelian.org/vlf/fbins.shtml#p=1456660800&b=110&s=sp  (110°) also shows a gap in the dash. However when the compass rose is steered towards 140°, the signal comes up exactly at the time of the gap. So it looks as if the direction of arrival would have temporarily been slewed southwards. Very strange...

 

All the best,

Markus (DF6NM)

 

 

  

 

 

-----Ursprüngliche Mitteilung----- 
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 28 Feb 2016 10:34 am
Betreff: Re: VLF: EbNaut 8270.1, Sunday Feb 28

...sorry the EbNaut sequence was terminated early due to operator error. Now sending straight carrier on 8270.0025 since 9:25. 

73, Markus

 

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 28 Feb 2016 10:08 am
Betreff: AW: EbNaut 8270.1, Sunday Feb 28

Another one started a few minutes ago 9:00:02, same parameters as on Friday.

 

73, Markus

 

 

Von: Markus Vester
Gesendet: Freitag, 26. Februar 2016 14:52
An: rsgb_lf_group@blacksheep.org
Betreff: VLF: EbNaut 8270.1, Friday Feb 26

 

Carrier on 8270.0025 on air again since 13:32, EbNaut will start 14:00:

 

Frequency: 8270.100 Hz,

start time 14:00:02, 

5 characters, 8K19A, 16 bit CRC, 10 second symbols,

total duration 5120 seconds,

end time 15:25:22.
 

Best 73,

Markus (DF6NM)