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Re: LF: Re: EbNaut tonite

To: [email protected]
Subject: Re: LF: Re: EbNaut tonite
From: DK7FC <[email protected]>
Date: Wed, 16 Jan 2019 14:15:00 +0100
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Hello Rob and Jay,

Many thanks for the reports and all the details. Jay, did you miss the 22 UTC transmission or did it not decode?
Interesting to see the phase plots. It is expected that the phase is less stable when the band opens. In the last transmission, the Eb/N0 is not high enough to see the phase pattern.
I wonder if the traces become more evident if 4K19 is used.

What happens when a solar event happens during the transmission time? Does it change the phase or just the D layer attenuation?
Maybe we can repeat the experiment, using 4K19A. Of course a carrier could be used too, but i like to 'play' with EbNaut.

So, tonite:

f = 137.545 kHz
Start time: 16.JAN.2019  22:00:00.3 UTC
Symbol period: 8 s
Characters: 4
CRC bits: 16
Coding 4K19A
Antenna current: 4 A
Duration: 30:56 [mm:ss]

 73, Stefan

Am 16.01.2019 12:29, schrieb Rob Renoud:
Late start but 7 successful decodes.  Have not gotten to phase plots yet...
UTC Rank C Eb/N0 Eb/N0 MSG Ref Phase
0100 0 5.6 1.6 2019 0,-30,0 30
0200 0 6.9 0.4 2019 60,30 30 0
0300 0 9.9 5.8 2019 90,60,60,0
0400 0 11.2 8.8 2019 180,180,150,150
0500 0 6.3 2.7 2019 0,-30,-30,-60
Rob – K3RWR
From: DK7FC
Sent: Tuesday, January 15, 2019 9:33 PM
Subject: Re: LF: Re: EbNaut tonite

Today, the messages will be transmitted as announced, starting 22 UTC

73, Stefan

Am 14.01.2019 22:16, schrieb DK7FC:
PS: Repeatinh hourly, until including 6 UTC.

Am 14.01.2019 22:13, schrieb DK7FC:
Hi LF,

Just a short EbNaut message tonite. I'm interested to see the phase changes on a long path. Markus's showrawsyms does a good job there, as long as 8K19A is used. A shorter message should also help to build up a clear trace.
So let's try an unusual short message:

f = 137.545 kHz
Start time: 14.JAN.2019  22:00:00.3 UTC
Symbol period: 4 s
Characters: 4
CRC bits: 16
Coding 8K19A
Antenna current: 4 A
Duration: 30:56 [mm:ss]

Reports, including phase plots, welcome :-)

73, Stefan
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