Re: LF: Strong signals on 8970.022 Hz

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

The PA does not like reactive power when running on the limit. The arcs become stronger until they limit themselfe, due to the detuning(detuning -> leaving the resonance peak = falling voltage), as long as you don't have an automatic variometer like i do on LF. With an automatic variometer you can hold the peak and run maximum power all the time, in nearly all conds, even if a few dozen birds take place on the wire :-))

73, GL! Stefan/DK7FC


Am 27.01.2013 14:08, schrieb uwe-jannsen@kabelmail.de:

Hi all,

In jo43sv it is snowing and raining.

the TX ant and other metal things in the yard show pretty colorful arcs.

but the PA doesn’t like it. In five minutes rhythm it switches it self off and on.

so I will put it out of its misery and will announce the beginning of the newly on the air time.

 

GL

Uwe/dj8wx

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Von: rsgb_lf_group@blacksheep.org
Gesendet: 26.01.2013 22:19
An: rsgb_lf_group@blacksheep.org
Betreff: Re: Re: LF: Strong signals on 8970.022 Hz

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Yes, Stefan,
the equipment has been switched off automatically at abt 0100UTC last night.
GL
Uwe/dj8wx/jo43sv

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Von: rsgb_lf_group@blacksheep.org
Gesendet: 26.01.2013 20:41
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: Strong signals on 8970.022 Hz

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Hi Uwe,

Have you been QRV last night, arround 0 UTC? I have a horizontal line on the right QRG at that time, not to strong but visible.
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html

Was that you?

73, Stefan/DK7FC

Am 26.01.2013 16:28, schrieb uwe-jannsen@kabelmail.de:

Hi Markus,

yes, on the air agn since 1200UTC, mode qrss3600.

the PA has been switched off automatically at 0100UTC.
it didnt like a bad fastened  input plug.

thanks for the grabber.

GL
Uwe/dj8wx/jo43sv

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Von: rsgb_lf_group@blacksheep.org
Gesendet: 26.01.2013 15:30
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: Strong signals on 8970.022 Hz

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Hi Uwe,

 

great to see some VLF activity again! Are you still on air today? Anyway I've reinvoked my dormant VLF grabber

http://www.mydarc..de/df6nm/vlf/vlfgrabber.htm

 

Best 73 & take care

Markus (DF6NM)

 

www.df6nm.de

 

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

From: uwe-jannsen@kabelmail.de

To: rsgb_lf_group@blacksheep.org

Sent: Thursday, January 24, 2013 6:52 PM

Subject: Re: LF: Strong signals on 8970.022 Hz

Hi Peter,

yes, its my TX.

when I switched it on I found the ant completely detuned – after several months since the last tests.

I didn’t change anything.

but the environment has been modified: I took down two huge trees – one five m and the other 10m off the wires.

makes two kHz up.

your grabber, the one of Lubos/OK1bvg and Todmorden/UK  shows the signs.

the carrier is not permanent ZOA because I have to switch the TX off when repairing the fence.

night times an “X” is transmitted, mode qrss3600.

Thanks for the VLF grabbers.

GL
Uwe/dj8wx/jo43sv

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Von: rsgb_lf_group@blacksheep.org
Gesendet: 24.01.2013 12:28
An: rsgb_lf_group@blacksheep.org
Betreff: LF: Strong signals on 8970.022 Hz

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Hello all.
I just took a look at my VLF grabber screens and was supprised to see a strong trace on 8970.022 Hz.
Must be Uwe, DJ8WX I guess...
On the air for abt 3 day's I think.
TNX for heating up the transmitter after such a long time !!!

My grabber is here: http://www.qsl.net/pa1sdb

73's Peter, PA1SDB