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RE: LF: Re: EbNaut considerations for tomorrow...

To: "[email protected]" <[email protected]>
Subject: RE: LF: Re: EbNaut considerations for tomorrow...
From: VIGILANT Luis Fernández <[email protected]>
Date: Tue, 4 Jun 2019 08:43:48 +0000
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Thread-topic: LF: Re: EbNaut considerations for tomorrow...

Hi Stefan, VLF

 

Yes, I decoded one character EbNaut message on 17.47KHz with this grabber. Attached is the decoder output

It was december 2017. Almost the good season J

 

Moving the grabber to a quiter place is an “old” plan. There are some options but all of them requiere dedication

and negotiation. in other words …. time! Using the transmitting antenna for Rx in VLF may be the quick option

 

I’m looking for 11.907Hz Alpha using the 90m vertical tuned for LF. I can get fainth traces with the MiniWhip

from 06 to 10 UTC which can be seen in my grabber. Let’s see if there is something detected with the vertical

despite the elevators QRM

 

I’m using the Perseur for that. The PC soundcard would be better at that frequency. Must make an interface

T-O-D-A-Y  ;-)

 

73 de Luis

EA5DOM

 

De: [email protected] [mailto:[email protected]] En nombre de DK7FC
Enviado el: lunes, 0
3 de junio de 2019 22:00
Para: [email protected]
Asunto: Re: LF: Re: EbNaut considerations for tomorrow...

 

Hi Luis, VLF,

Yes, certainly not the best time in the year, but never mind. We could just try and see. My signal from the ground loop is much stronger than from the INV-L at the institute. So there is a chance. Summer activity, you know...

We had success on 17.47 kHz, right? What was the message length? Or was it 'just' the carrier detection noted in Paul's list, seen at http://abelian.org/vlf/tmp/EA5DOM_171202.jpg

Looks like your VLF grabber is strongly dominated by QRM at that location. Can you try to mount it at the remote site? :-)

Yesterday i decided to transmit some DFCW-180 at 5170 Hz but suddenly my DC/DC converter made a BANG and started smoking. Odd. I don't know why but tomorrow i will find the problem and repair it. So there was no experiment...
Another idea would be trying slow-HELL on VLF. Meanwhile it is possible :-)


73, Stefan



Am 02.06.2019 22:10, schrieb VIGILANT Luis Fernández:

Hi Stefan, VLF

 

Yes, I still run the 8270Hz grabber (see almost last screen) https://ea5dom.ure.es/grabber/index.html

But QRM is too high here. I have never been able to detect a signal in that band yet

 

But can see that the vertical antenna for LF transmission performs quite good in LF and VLF

Opposite to MF, were the noise when it was tuned there was a real hell, so it was ususable for Rx

 

Would be interesting to check this antenna in 8270Hz. But need to arrange some

hardware to use it with the PC soundcard and 1pps

 

From 6 to 10 UTC the elevators are intensively used here. Fortunately it seems that the QRM from the motor

variators is not so high at VLF. Let me arrange the Rx side and will be ready for a test

 

73 de Luis

EA5DOM

 


De: [email protected] [[email protected]] en nombre de DK7FC [[email protected]]
Enviado: sábado, 1 de junio de 2019 15:55
Para: [email protected]
Asunto: VLF: EbNaut considerations for tomorrow...

Hi Luis,

Another question: Are you still running your VLF grabber? And are you interested to try to receive an EbNaut message at 8270 Hz (again)?
I have some time here near the TX antenna and like to TX a bit again, on whatever ferquency, Trying a first message decode from DL > EA could be challenging.

Or, if someone else likes to join or suggest something, i'm open for ideas.

There is only a small time window where the QRN is low, about 6...10 UTC. But with my new TX-system this is just fine because a transmssion wouldn't take much longer than 2 hours anyway.


73, Stefan



Am 30.05.2019 10:52, schrieb VIGILANT Luis Fernández:

Hi LF

 

Apart from cheking that blacksheep is still running ;-)

 

Just a notification to LFMEN

I’m transmitting WSPR-2 during daylight to check conditions as we approach summer solstice here

About 2,7A RF current normally

 

The PA is still down at home, so switched off at night. But then I can use the 90m vertical for RX

QRM is high but overall is a very good performer. I can report Chris 2E0ILY with nice signals and also others which

unfortunately don’t transmit during best night hours. This reports can be seen spotted as EA5DOM/3

There is a permanent 24/7 Rx using MiniWhip with poorer Rx spotting as EA5DOM/2

 

As conditions get worse during daylight I will switch to WSPR-15 and hope to get somebody reporting there in

the forgotten mode

 

73 de Luis

EA5DOM

 

 

Attachment: DK7FC EbNaut decode 17470100 5 dec 2017.JPG
Description: DK7FC EbNaut decode 17470100 5 dec 2017.JPG

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