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Re: VLF: 300 mA on 8270 Hz

To: [email protected]
Subject: Re: VLF: 300 mA on 8270 Hz
From: DK7FC <[email protected]>
Date: Wed, 27 Sep 2017 00:01:25 +0200
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Hi Paul,

I already expected that you were in holidays.

Am 26.09.2017 13:56, schrieb Paul Nicholson:

So now there are all these messages to decode... Ah yes I am
needed - but only to read the emails and run the decoder.
Of course you are needed. There are a lot of things to do this winter season! :-)

So the following is just
using the loops:

 2017-09-22: +0.4 dB phase 126.0 list rank 8225;
 2017-09-23: +1.6 dB phase 131.0 list rank 0;
 2017-09-24: +0.3 dB phase 134.0 list rank 242;
 2017-09-25: +2.2 dB phase 127.2 list rank 0;

All decoded an obviously correct message with uniform reference
phase, using the optimum list length for uniform phase;

Stacking all four gives Eb/N0 = +7.2 dB.
 Great results. Especially the phase is interesting! Quite ow variations.

There are a few days remaining within the 100 transmit hours test. I had the idea to try to send a 100 character message over to you, on each band, with as much stacking as necessary. 8.27 kHz will be easy. 6.47 kHz will be well possible too. Then 5.17 kHz will be a challenge. And 4470 Hz will be a hard challenge! Let's see what we do.
Now, let's try:

f = 8270.005000 Hz
Start time: 27.September.2017  06:00:00 UTC (daily)
Symbol period: 8 s
Characters: 100
CRC bits: 16
Coding 8K19A
Duration: 11h,16min,16sec
Antenna current: 300 mA

Paul, tell the message if you got it. I hope that 4 days will be enough. After that test, i'll go down to 6.47 kHz.

73, Stefan

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