Re: VLF: Sunday morning test 8270.020 Hz

["Markus Vester" <markusvester@aol.com>]

Thank you Lubos and Peter!

 

Paul Nicholson's http://abelian.org/vlf/sg8270.php is also starting to show the two carriers. Even though his synthetic loop antenna is pointing to 70 deg azimuth, a tick too far north for me.

 

I'm currently driving 0.3 A into the fairly small antenna (24 kV at 240 pF). The effective height was measured as 9m at LF, probably slightly lower at VLF, maybe 8m or so. At 36.3 km wavelength, this would give 77 microohms radiation resistance and 12.6 uW ERP. The synchronisation is derived from DHO 23.4 kHz taken off a small loopstick. Judging by the interference pattern on the local Loran monitor (GRI 7001 on http://www.df6nm.de/LoranView/LoranGrabber.htm), the phase of the VLF carrier seems to be stable.

 

Best 73,

Markus (DF6NM)

From: Lubos OK2BVG

Sent: Sunday, April 07, 2013 11:41 AM

To: _RSGB_LF

Subject: RE: VLF: Sunday morning test 8270.020 Hz

Hello Markus, Peter and VLF!

Well done! There are two signals on my grabber now. Great!

Markus, your VLF set is doing very well. Although you are useing  "QRP" only (as you wrote in your e-mail), the signal is nicely visible here. Congratulation!

73!

Lubos, OK2BVG, JN88KS

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From: markusvester@aol.com
To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
Date: Sun, 7 Apr 2013 11:02:57 +0200
Subject: Re: VLF: Sunday morning test 8270.020 Hz

Great, it seems to work! DJ8WX had apparently interrupted his carrier for an hour but has come back. To my surprise, I seem to be making it to Appingedam as well

 http://www.ok2bvg.cz/vlfgrabber/

 http://www.qsl.net/pa1sdb/

 

Thanks to Lubos and Peter for monitoring and running your excellent online grabbers, and to Uwe for motivation and company!

 

Best 73,

Markus (DF6NM)

 

From: Lubos OK2BVG

Sent: Sunday, April 07, 2013 8:45 AM

To: _RSGB_LF

Subject: RE: VLF: Sunday morning test 8270.020 Hz

Hello Markus, VLF!

I am looking forward to see your signal on my grabber. It would be fine to see both signals, from  Uwe and you, together.  

73!

Lubos

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From: markusvester@aol.com
To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
Date: Sat, 6 Apr 2013 21:03:37 +0200
Subject: VLF: Sunday morning test 8270.020 Hz

This afternoon I have resonated the venerable seven-bucket VLF coil to my home antenna on 8.27 kHz, and I'm currently running a test transmission on 8270.020 Hz. Assuming appropriate weather conditions (ie no wind and rain, but cold and grey so that the neighbours won't want to enjoy their gardens and complain about the tone), I intend to join Uwe 5 mHz below his carrier, for a couple of hours starting sometime around 8 UT tomorrow. The signal will be weak (10 uW ERP) but I'm hoping to leave a trace in Lubos' grabber window.

 

Best 73,

Markus (DF6NM)

 

www.df6nm.de