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Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz

To: [email protected]
Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
From: DK7FC <[email protected]>
Date: Mon, 14 Nov 2016 16:25:06 +0100
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Hello Paul, VLF,

Well, its almost unbelivable. What can i say, i'm really impressed, your results are remarkable! Congrats to your and our success. We continue to learn about working on VLF. The 46km band is very interesting i find. Actually all this is worth to write an article somewhere i find. But i am not the one to do that, lack of motivation, somehow.

In the recent weeks i became a bit sceptic if we will ever manage to pass 20 characters on that band. But now i am very optimistic about it. With the tecnique we are currently experimenting with, it will be possible. 20 characters would be fine, then i would leave that band and move down to 5.17 kHz, like in the good old kite experiment times. The 58 km band, wow :-) I'm looking forward to that!!! And i am optimistic that we will manage, let's say and define: 15 characters! That should be the goal :-) But, if you like, we could try to start an attempt to transfer 50 characters on 6.47 kHz with the currently tested technique. I already found a message ;-) It would be sent at 10 second symbols 8K19A, taking 07:25:20, each day.

Am 12.11.2016 08:06, schrieb Paul Nicholson:

On Oct 7th Stefan wrote:

> f = 6470.00000 Hz
> Start time: 07.10.2016   21:00:02 UTC
> Symbol length: 80 s
> Characters: 15
> CRC 16
> Coding 16K25A
> Duration: ?? Something arround 44 hours?
> Antenna current: 270 mA (ish)

Copied 'DK7FC JN49IK 73'

I confirm. You've got it! That is the best result so far. I will update my list :-) Done, the list is in attachment. It is not complete yet, actually the SNR in BW is more informative than the message itselfe. Anyway...

73, Stefan

Attachment: EbNaut_VLF_list.png
Description: PNG image

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