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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 23:54:01 +0100
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Hello to Italy :-)

That's funny, we are now side by side in 5 Hz steps. With 4K19A, the occupied bandwidth should be very small. I listen to the signal with a TECSUN PL-660er with its built in ferrite antenna.
Unfortunately we can't give us reports to each other ;-)
A lot of work for the RX stations :-) And challenges!

73, GL all,

PS: Also got an EbNaut decode from K3SIW last night. He's going to listen again this night, so there are chances for nearly 8000 km distance?

Am 16.01.2019 21:52, schrieb Riccardo Zoli:

Hi LF & EbNauters.

Ok, Stefan and Domenico: I'll join you with the same transmission coding and parameters on 137.535 kHz (message repeated hourly, 1st on 2100z, last on 0700z).

Reports are welcome.

All the best

73 de Riccardo IW4DXW

Il giorno Mer 16 Gen 2019, 21:03 Domenico IZ7SLZ <[email protected]> ha scritto:

I will transmit a 4 character message with EbNaut on 137.540 kHz, sym=8s, code=4K19A, CRC=16.
Transmissions will start on 2019-01-16 22.00 UTC with a duration of 30' 56''; then repeated every hour. Last transmission on 2019-01-17 06:00.

TX setup in use: Paul N. Program 'EbSynth' steered with 10 kHz from GPS, analog SSB exciter with reference oscillator steered by the same GPS, 'gpds' and 'chrony' programs for controlling the UTC time of the computer.
Antenna current = 1.5 A, antenna type rev-L 8+8 meters.

Reports are welcome.

73, Domenico IZ7SLZ / JN80nu


On Wed, 16 Jan 2019 at 15:57, Domenico IZ7SLZ <[email protected]> wrote:
Hello Stefan and LF,

results of decoding for your EbNaut signal in JN80nu are at

Attached to this email there is a folder with the plots of the eight periods. First two transmissions seems to be affected by fading.

I want to join your EbNaut session tonight with some transmissions from my side. I will announce the parameters as soon the setup is ready.

73, Domenico IZ7SLZ

On Wed, 16 Jan 2019 at 14:20, DK7FC <[email protected]> wrote:
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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