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Re: LF: Who is transmitting on 8970.022 Hz??

from [Roger Lapthorn] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Who is transmitting on 8970.022 Hz??
From: Roger Lapthorn <[email protected]>
Date: Thu, 3 Mar 2011 16:32:22 +0000
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Uwe,

Congratulations. I am already looking for your signal on 8970.022Hz and will let you know if I see it in 423uHz BW. 

My grabber is active now centred on 8970Hz. See https://dl.dropbox.com/u/15047843/xbm_grab.jpg. Please take a look to see if you become visible.

I will add you to the table on my sub-9kHz webpage shortly. Activity in Europe is developing so fast that I am struggling to keep this table up to date!

73s
Roger G3XBM


On 3 March 2011 15:19, <[email protected]> wrote:

Hi all,

 

its no longer a secret :

Stefan and Markus found a carrier at 8970,022Hz on Stefans and Gerhards grabber and I had to confess that its origin is my QTH because the TX was switched on at 1740UTC yesterday and that matches the visibility of the carrier on Gerhards grabber.

 

My aerial: pse see

 

http://dj8wx-dl.de/hompage500kHz/TX%20equipment.htm

 

second last pic on the site. The 23m long wire has been lengthened by an other 20m.

The radiasls have a overall length of  500m.

 

I tried a measuring of the current between  the footpoint of the matching coils and the radials:

Sri, but the meter doesnt show more than 200mA and its far > than that.

 

The TX bumps 7,5A at 284Vpp (753Wrms) into the field coil of 134uH (Z 7,5 Ohm).

 

The diameter of the circuit single layer winding coils: on average 60cm.

inductivity: 245mH.

 

The generator is a homebrew BPU lf-exciter with the possibility of all usual kinds of modulations.

 

The class E PA makes 2,4kWrms on NF. I could get 1700Wrms out of this (misused) disco PA on 9kHz.

When I did so the consequence was:  One couldnt touch any garden hand tools or other things longer than 50cm.

Txing with 750W: My XYL doesnt shriek any more when working in the garden and touching p.e. the barrow.

 

Best regards

Uwe/dj8wx still txing a carrier on 8970,022Hz. In some days Ill send in qrs6000.

 



Von: [email protected]
Gesendet: 02.03.2011 16:20
An: [email protected]
Betreff: LF: Who is transmitting on 8970.022 Hz??


VLF,

Someone is transmitting on 8970.022 Hz, visible in my "DFCW-6000" window
and visible at OE3GHB! It is neither Markus nor Ossi nor Gerhard nor me,
so who is it??? :-)
Frequency is very accurate over time!

On 8969.97 i am doing a local test so pse don't wonder.

73, Stefan/DK7FC



--
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www.g3xbm.co.uk
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G3XBM   GQRP 1678    ISWL G11088
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