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LF: Transmitting on 8969.997 Hz today

To: <[email protected]>
Subject: LF: Transmitting on 8969.997 Hz today
From: "Markus Vester" <[email protected]>
Date: Sun, 10 Oct 2010 09:11:39 +0200
Cc: "Paul" <[email protected]>
In-reply-to: <DA3FE8DC90364FAEAD453F23D12C92A2@Black>
References: <B24E1624B36348E1982ADE31636A198C@Black> <114D6EDF6AF54DF0A20FCDED840DDDAE@Black> <[email protected]> <DA3FE8DC90364FAEAD453F23D12C92A2@Black>
Reply-to: [email protected]
Sender: [email protected]
The sun has come up and removed the moisture fromthe antenna wires, and the transmitter is on air again since 9:00. Today's frequency is 8969.997, 1 mHz lower than yesterday. I hope to leave the signal on till afternoon.
 
73, Markus (DF6NM)
 
----- Original Message -----
Sent: Saturday, October 09, 2010 8:09 PM
Subject: Re: LF: Re: Transmitting on 8969.998 Hz

Thanks a lot Stefan for this nice confirmation! I'm quite amazed that it did work so well. And congratulations to you - as they say, with QRP all the hard work is being done on the receiving side! And I recall our conversation not long ago, when the two of us half-jokingly calculated that we could probably work each other at one bit a day ;-)
 
The amazing thing is that virtually everybody can do this. For transmitting, all you need is an average LF backyard marconi, or a strapped 80 m dipole with reasonable insulation. We actually live on a fairly small plot, and I have 42 m of wire up at about 7m effective height. A power of 80 W gives around 0.28 A (ie. 21 kV antenna voltage). Thanks to Spectrum Lab, accurate GPS or MSK stabilisation has become almost straightforward.
 
I have stopped the transmitter now at 18:00, as I do not dare to let it run through the night. If conditions allow, I will try to add another dash tomorrow ;-)
 
Best regards,
Markus (DF6NM)
 
----- Original Message -----
Cc: Paul
Sent: Saturday, October 09, 2010 6:22 PM
Subject: Re: LF: Re: Transmitting on 8969.998 Hz

Hello Markus, VLF,

Yes, indeed. 10 dB S/N in 47 µHz :-) Unbelivable! This indicates that your transmitter and my receiver must be quite accurate ;-)

Markus, here we may achieve some very important informations: The QRN will rise in some hours but maybe your signal level will rise too! The maximum S/N may be achieved, as a function of daytime! I am looking forward to your transmission!! Please don't stop! :-)

This can be seen as a new record: The first transmission/reception above 1 lambda (even above 5 lambda) on VLF that is generated by a fixed station (means not /p) .
You could run the carrier for days and 100 W TX power is managable. But: Transmitting "NM" means transmitting 66 hours, without the breakes. If 1 kWh costs 0,2 Euro, you have to pay 1,33 Euro. So you should place the coil not on your roof but directly in the kitchen to 'save' at least the coil losses by heating your home! ;-)

73, Stefan/DK7FC

Maybe Paul Nicholson can receive your signal too. I would wonder if not! ;-)



Am 09.10.2010 16:14, schrieb Markus Vester:
There seems to be a peak on DK7FC's grabber...
 
----- Original Message -----
Sent: Saturday, October 09, 2010 1:21 PM
Subject: LF: Transmitting on 8969.998 Hz

Frequency changed to 8969.998 at 9:50, to be within Stefan's 47 uHz window.

----- Original Message -----
From: Markus Vester
To: [email protected]
Sent: Saturday, October 09, 2010 11:41 AM
Subject: VLF: Transmitting on 8969.98

Since about 9:30, I am radiating a carrier on 8969.98 Hz (GPS controlled) from my home antenna, EMRP approx. 5 uW. I hope to be able to keep it up for a few hours, despite  the presence of minor partial discharges somewhere around the house, as indicated by the noise visible on the LF grabber.

Best 73,
Markus (DF6NM in JN59NK)

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