Re: LF: OK2BVG_TX_8970

["qrss@talktalk.net" <qrss@talktalk.net>]

Hello Lubos

I had to wait some time for the FFT to confirm that the signal had gone and then take a capture.
I have 2 lines one is on 8.97kHz, actual reading 8.6999863kHz. I read on VLF group that Paul also had 2 lines but his 2nd one was LF and mine is HF.
My first recognition of a line is after 08.00UTC which could be propagation, the end time was not before 12.30UTC but is not precise due to noise up to 12.50UTC.

In the attached capture you can see how marginal the signal is, despite starting and ending at the right times. The other signal close by HF is something which adds to the uncertainty. Only a much longer send period with a break or two would make confirmation possible.

On balance I think it is you, if so very well done :-)

73 Eddie G3ZJO
 

On 11/03/2011 12:47, Lubos OK2BVG wrote:

Hello Eddie!

Thanks, for your receiving! My TX was on from 08:00 to 12:30UT. Did you detect my signal?

Lubos, OK2BVG

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Date: Fri, 11 Mar 2011 06:52:19 +0000
From: qrss@talktalk.net
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: OK2BVG_TX_8970

Hi Lubos

RX is on this morning awaiting your test.

Good Luck

Eddie G3ZJO

On 10/03/2011 19:08, Lubos OK2BVG wrote:

Hello Stefan, Markus, Gerhard and all VLF enthusiasts!

I was quite busy during last days, so I am writing just now.

Well... I tested my new VLF TX set of the day  5th March. It was the first test only and I am very pleased, you saw my signal. I expected, it would be poorly visible  on the Gerhard´s grabber only! In fact, it was visible with S/N 10dB.

Some information:

The antenna is my MW Marconi L (24m up), but I increased top load on the value 220m.

Generator is Wandel/Goltermann PS30, the finest tuning step 1Hz (OCXO).

PA is Seba Dynatronic 25W out.

My loading coil is made from 60l barrel, it contains two fixed coils  500 + 500 turns of wire 0,4CuL + rotary coil made from 5litre bucket.

I am going to take some photos and give them on my websides at the weekend. I will let you know, they are there.

My next VLF test will be tomorrow (2011-03-11):    

I will start transmission on 8970 tomorrow morning at 08:00UT. 

Than I won´t be at home, so TX will transmit to approximately 12:00UT. It is the best time for VLF TX test, becouse the noise would be the lowest.

Thanks for your encouraging words and help! 

73!

Lubos

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Date: Wed, 9 Mar 2011 18:23:59 +0100
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: OK2BVG signal in Todmorden

Wow, the next one!
Lubos, can you tell us about your station? All parameters and data please :-)
How strong have you been visible at OE3GHB?

Welcome in the VLF TX group ;-)

73, Stefan/DK7FC


Am 09.03.2011 10:49, schrieb Markus Vester:

Dear Lubos, LF,

 

beneath is a posting from Paul Nicholson in the Yahoo VLF groop. His spectrum from last Saturday morning shows three amateur signals, including yours.

 

Very good!

 

73, Markus

 

________________________________

Re: [VLF_Group] Re: DF6NM on 8970.00

Tue Mar 8, 2011 11:54 pm

Thanks for the info Markus.

> I do not know whether that was really a transmission
> from Lubos, or a local pretest from Gerhard.

Yes, that long dash was Lubos.
OK2BVG was active that morning for a couple of hours.

I get this spectrum, (08:00-09:00, 278uHz bins)

http://abelian.org/vlf/tmp/110308b.gif

which has a small peak at 8970Hz - 3.0mHz, bearing east.

To bring this out I found the best S/N at bearing 110 and
I synthesised a unidirectional cardioid by combining H and E fields.

Only 3.6 sigma unfortunately.

Hopefully Lubos will do further tests. He should be visible
here with 30uW at 1423km if the tx frequency is stable enough.
--
Paul Nicholson
--

Re: [VLF_Group] Re: DF6NM on 8970.00 Thanks for the info Markus. > I do not know whether that was really a transmission > from Lubos, or a local pretest from Gerhard. Yes, that long dash was Lubos. OK2BVG was active that morning for a couple of hours. I get this spectrum, (08:00-09:00, 278uHz bins) http://abelian.org/vlf/tmp/110308b.gif which has a small peak at 8970Hz - 3.0mHz, bearing east. To bring this out I found the best S/N at bearing 110 and I synthesised a unidirectional cardioid by combining H and E fields. Only 3.6 sigma unfortunately. Hopefully Lubos will do further tests. He should be visible here with 30uW at 1423km if the tx frequency is stable enough. -- Paul Nicholson --

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