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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: Fri, 07 Oct 2016 23:01:22 +0200
In-reply-to: <[email protected]>
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Hi Paul,

It's the weekend and the antenna must be used for transmissions :-)
As long as there is no decode i'm starting another transmission, this time using 16K25A for the first time:

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)

My suggestion for a next version of the EbNaut Sender software: Displaying the duration of the transmission (depending on the mode and number of symbols). This can be an important information for TX stns.

73, GL, Stefan



Am 07.10.2016 13:42, schrieb DK7FC:
...transmission completed. Suddenly there was a lot of noise again which makes a decode more unlikely :-( There average antenna current was 270 mA.

Any results, Paul?

73, Stefan

Am 05.10.2016 22:40, schrieb DK7FC:
Hi Paul, VLF,

Time to continue and complete that experiment: The goal is 20 characters on 6.47 kHz.
I just re-built the system, the TX runs 260 mA on 6470 Hz.

Now, the nexct attempt:

f = 6470.00000 Hz
Start time: 05.10.2016   21:00:02 UTC
Symbol length: 140 s
Characters: 15
CRC 16
Coding 8K19A
Duration: 38h, 34m, 40s

Antenna current: 250 mA (ish)

73, Stefan


The last and best result so far:
Am 21.05.2016 04:15, schrieb Paul Nicholson:
Stefan wrote:

> f = 6470.00000 Hz
> Start time: 20.05.2016   00:30:02 UTC
> Symbol length: 100 s
> Characters: 10
> CRC 16
> Coding 8K19A

Copied 'THAT WORKS'

Eb/N0 = +2.7 dB, constant reference phase

Carrier: 19.25 dB in 13.3 uHz

Error map: http://abelian.org/vlf/tmp/160520a.gif

--
Paul Nicholson
--

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