Re: LF: OK2BVG_TX_8970

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Hi Lubos

Until Saturday evening I am not at home (I am with our grandson) so I cannot look for your signal. If you are transmitting on VLF on Sunday I shall try to see you. If G3ZJO is able to copy there is a good chance I will copy you too. 

Congratulations on being copied by Paul Nicholson - that is very good DX for 25W. 

73

Roger G3XBM

Via my 2.4GHz handheld (iPod Touch 4g)

On 11 Mar 2011, at 18:53, Lubos OK2BVG <bvgbob@hotmail.com> wrote:

Hello Stefan!

Yes it is true. My PWR is 25W, antenna current is 300mA. But I use fixed antenna, as you know, so the ERP is cca 30uW only (I can expect this value thanks to Gerhard´s calculation).

Today´s test was very interesting.

Lubos

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Date: Fri, 11 Mar 2011 19:16:32 +0100
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: OK2BVG_TX_8970

Hello Lubos,

Sorry, i haven't seen anything it seems. But 600 km by using 25 W at 8970 Hz would almost be a wonder :-)

Go on and good luck

73, Stefan


Am 11.03.2011 13:47, schrieb Lubos OK2BVG:

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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