Re: LF: EbNaut tonite

[Domenico IZ7SLZ <iz7slz.domenico@gmail.com>]

Hello Alex, all

first of all, Alex,  i confirm that your email has been reflected.

Catching your message was almost a 'bingo' becouse of uncertainty of the frequency. I have tested in the other hours without results. As you known, EbNaut requires the milliHertz precision. To prove this, i have often tryed to shift the frequency of -only- 1 mHz on the strong signals of IW4DXW and i loose completly the decode.  The Markus' plot often can't help to find the offset if this is larger than 0.5 mHz or if the signal is DX.

EbNaut with a TXCO is possible but only for short periods. In 15 or 30 minutes the drift is (hopefully) not too much, so the signal can be decoded.  So, for now, it should be better if you reduce the no. of symbols or their duration.

I understood that you are in a good way for EbNaut but you need a GPS or Rb to stabilize the QRG . You can easly found on the Bay an used GPS frequency reference (Trimble Thunderbolt or similar) . They provide an output of 10 MHz and you can drive your DDS with this. I found for 80 Euros one Epsilon-Clock 10 MHz.

Once the GPSDO is ok, then you can try OP32 transmissions and check the results on 'The' great Markus' grabber. If your milliHertz's are steady, then your setup is EbNaut ready.

Why "list=10000"? 

Yes, sorry. This comes from previous settings of the auto-decoder just to be sure to search also fo high rank decodes.

Check also PSE:

2019-01-23  1 transmission only from 04:00

no, sorry this is not possible becouse unfortunatly the storage hard disk becomes full yesterday night (around 23.00 UTC) so no more recording after that hour.

I have restarted system this afternoon after 14.00 UTC so i can check for this night, if you will be again on air

73, Domenico IZ7SLZ

On Wed, 23 Jan 2019 at 17:29, Alex R7NT <r7nt.73@gmail.com> wrote:

Domenico,

my msgs go very long time or do not reach rsgb_lf_group at all :(

73! Alex R7NT  136.73.ru    AWLF 136.73.ru/h_aw

---------- Forwarded message ---------
From: Alex R7NT <r7nt.73@gmail.com>
Date: ср, 23 янв. 2019 г. в 19:14
Subject: Re: LF: EbNaut tonite
To: <rsgb_lf_group@blacksheep.org>

Domenico,

TNX for efforts!

This is right, but I'm not sure abt exact freq and time was from 2019-01-18 21:00 till 2019-01-19 05:00. Why "list=10000"? 

Check also PSE:

2019-01-23  1 transmission only from 04:00

137546.1  N=3 T=8s 8K19A CRC-16 3328.0 s

PSE inform abt the sufficient stability and phase of my EbNaut signal

73! Alex R7NT  136.73.ru    AWLF 136.73.ru/h_aw

ср, 23 янв. 2019 г. в 17:54, Domenico IZ7SLZ <iz7slz.domenico@gmail.com>:

Hi LF & Ebnauters,

returning home after a trip, i did a re-play of the recordered audio of last nights.

I got some decoders of VO1NA and plenty of the 'local' stations here IW4DXW and DK7FC.

https://qsl.net/iz7slz/EBNAUT/DECODED.TXT

Riccardo ask for the phase diagrams (show_raw_sym by Markus); i have uploaded plots of IW4DXW, DK7FC and VO1NA in the folder

https://drive.google.com/drive/folders/1pdpaTzujy6ZzZnoPS7Jsh9KxcwaRIUw9?usp=sharing

For a casuality, i got a message with the Alex RN7T parameters in a close frequency:

--------------------------------------------------------------------------------------------
2019-01-19_02:00:00 137544.800Hz N=3 T=8s 8K19A CRC=16 list=10000 sym=416 Duration=3328s
T_OFFSET=0.1s F_OFFSET=0.000Hz
found rank 8326 ber 3.6779e-01 Eb/N0 1.5 M -4.353520036e+00 ph 1 180,180,180,180 [QRL]
found rank 690 ber 3.6538e-01 Eb/N0 1.7 M -4.711310863e+00 ph 3 -150,-150,-150,-150 [QRL]
--------------------------------------------------------------------------------------------

Is the message right ?

73, Domenico IZ7SLZ

On Wed, 23 Jan 2019 at 05:02, Alex R7NT <r7nt.73@gmail.com> wrote:

EbNaut enthusiasts,

I start before Sunrise in my QTH (abt 05:00 UTC)

QRG 137546,1 Hz

Coding 8K19A

CRC 8

8 sec./sym.

3 characters

duration 55:28

1st on 04:00 UTC  

73! Alex R7NT  136.73.ru    AWLF 136.73.ru/h_aw

вт, 22 янв. 2019 г. в 22:20, Riccardo Zoli <riccardozoli80@gmail.com>:

Jay, Rob, LF

QRG 137545 Hz

Coding 8K19A

CRC 8

3 sec./sym.

8 characters

duration 29 min. 36 sec.

no time delay

(1st on 1930 UTC, last on 0700 UTC)

Reports are welcome

All the best

73 de Riccardo IW4DXW

Il giorno Lun 21 Gen 2019, 23:03 <jrusgrove@comcast.net> ha scritto:

Riccardo

 

Glad to hear you found the problem. Will await your announcement and look for your signal tomorrow night.

 

Jay W1VD

----- Original Message -----

From: Riccardo Zoli

To: LF Group

Sent: Monday, January 21, 2019 4:13 PM

Subject: Re: LF: EbNaut tonite

Jay, Rob, Markus, Stefan, Joe, LF

Jay, thanks again for the decode: congrats for your rx setup.

And thank you so much for trying, Rob.

Here, the TP2 reference signal (not sufficiently filtered) overshot sometimes the quadrature divider (x4) causing that phase jumps. The problem is now fixed.

A new TX EbNaut session is scheduled for starting tomorrow evening.

All the best

73 de Riccardo IW4DXW

Il giorno Lun 21 Gen 2019, 13:20 jrusgrove@comcast.net <jrusgrove@comcast.net> ha scritto:

Riccardo

 

Corrected decode:

 

0300 Rank 0 car Eb/N0 2.3 Eb/N0 1.4 FBDECODE

 

Jay W1VD

 

 

 

----- Original Message -----

From: <jrusgrove@comcast.net>

Reply-To: <rsgb_lf_group@blacksheep.org>

To: <rsgb_lf_group@blacksheep.org>

Sent: 1/21/2019 6:53:39 AM

Subject: Re: LF: EbNaut tonite

---

Stefan, Riccardo & EbNaut-eers

 

 

Stefan ... good copy throughout the night. Riccardo ... unfortunately only one decode to report. Markus noted a frequency error ... curious if propagation or NE0-M8T?

 

 

137545

 

2200 Rank 0 car Eb/N0 9.5 Eb/N0 9.2 RADIO GAGA

2300 -

0000 Rank 0 car Eb/N0 9.2 Eb/N0 9.3 RADIO GAGA

0100 Rank 0 car Eb/N0 6.0 Eb/N0 6.0 RADIO GAGA

0200 Rank 0 car Eb/N0 5.3 Eb/N0 5.9 RADIO GAGA

0300 Rank 0 car Eb/N0 6.1 Eb/N0 6.8 RADIO GAGA

0400 Rank 0 car Eb/N0 11.3 Eb/N0 10.4 RADIO GAGA

0500 Rank 0 car Eb/N0 3.7 Eb/N0 4.6 RADIO GAGA

0600 Rank 0 car Eb/N0 10.6 Eb/N0 10.2 RADIO GAGA

 

 

137547

 

0300 Rank 0 car Eb/N0 10.0 Eb/N0  FBDECODE

 

Jay W1VD

 

 

 

 

 

 

----- Original Message -----

From: DK7FC <selberdenken@posteo.de>

Reply-To: <rsgb_lf_group@blacksheep.org>

To: <rsgb_lf_group@blacksheep.org>

Sent: 1/20/2019 12:48:34 PM

Subject: LF: EbNaut tonite

---

LF,

Tonite:

f = 137.545 kHz
Start time: 20.JAN.2019  22:00:00.3 UTC (hourly, including 6 UTC)
Symbol period: 1 s
Characters: 10
CRC bits: 12
Coding 16K21A
Antenna current: 4 A
Duration: 24:32 [mm:ss]


73, Stefan