Re: LF: EbNaut tonite

[<jrusgrove@comcast.net>]



Stefan

 

Yes, I was aware of that. It probably would have been a good idea to have defined 'low Rank' ... last night there were a number of decodes well under 250 ... many just double digits. Can't recall that happening in past sessions so thought it was noteworthy. 

 

Jay W1VD

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

From: DK7FC

To: rsgb_lf_group@blacksheep.org

Sent: Wednesday, January 23, 2019 8:19 AM

Subject: Re: LF: EbNaut tonite

Hi Rob, Jay,

You need to select a lower list length if CRC8 is used together with 8 characters.
See http://abelian.org/ebnaut/calc.php?sndb=20&snbws=&snmps=1776&code=8K19&sp=3&crc=8&nc=8&submit=Calculate to calculate the optimum list length. It is 280 for a full phase search. If you keep the default 20000, then a number of false decodes are highly likely.

73, Stefan

Am 23.01.2019 13:31, schrieb Rob Renoud:

Riccardo and Jay,

No decodes here either.  Had a number of low Rank false decodes also.  Suspect the low CRC  may have allowed the false decodes.  I had similar results during the previous run.

Suggest a shorter character message with a higher CRC with a similar duration.  Also, if possible,  suggest transmitting the message on the hour and running an unmodulated carrier during the idle period to enable monitoring with ARGO or a similar app.  I have found this very useful tool with EbNaut transmissions from VO1NA and K3SIW on 2200m and 185.185... kHz (LoFER) respectively.

73,

Rob - K3RWR

On Jan 23, 2019, at 06:17, "jrusgrove@comcast.net" <jrusgrove@comcast.net> wrote:

Riccardo

 

Late start last night (0000z). Unfortunately no decodes. There were numerous low Rank false decodes ... not sure what's up with that!

 

Jay W1VD

 

 

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

From: Riccardo Zoli <riccardozoli80@gmail.com>

Reply-To: <rsgb_lf_group@blacksheep.org>

To: LF Group <rsgb_lf_group@blacksheep.org>

Sent: 1/22/2019 2:48:00 PM

Subject: Re: LF: EbNaut tonite

---

Sorry: message repeated every 30 minutes.

73, Riccardo IW4DXW

Il giorno Mar 22 Gen 2019, 20:15 Riccardo Zoli <riccardozoli80@gmail.com> ha scritto:

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