Re: LF: EbNaut

[Riccardo Zoli <riccardozoli80@gmail.com>]

Jay and Rob,

thank you again for your efforts (and patience) to receive my signal across the pond.

Thanks also to Stefan and Michel for the plots: I think the undesidered phase jumps problem still not fully resolved here.

So, good job, Jay! My antenna is an inverted "L" (12m. heigh, 36m. long) fed near the top with about 300W.

All the best

73 de Riccardo IW4DXW

Il giorno Dom 20 Gen 2019, 13:50 Rob Renoud <k3rwr@md.metrocast.net> ha scritto:

Riccardo and Jay,

Great to see you made the TA connection!  No decodes here unfortunately.

Rob - K3RWR

On Jan 20, 2019, at 06:26, "jrusgrove@comcast.net" <jrusgrove@comcast.net> wrote:

Riccardo

 

Better results last night ... congratulations on 4 decodes!  What is you power and antenna?

 

2200 -

2230 -

2300 -

2330 - 

0000 -

0030 - 

0100 Rank 1 car Eb/N0 1.3 dB Eb/N0 1.1 dB IW4DXW

0130 -

0200 Rank 2067 car Eb/N0 0.7 dB Eb/N0 0.1 dB IW4DXW

0230 -

0300 -

0330 Rank 0 car Eb/N0 4.6 dB Eb/N0 4.5 dB IW4DXW

0400 -

0430 Rank 284 car Eb/N0 -0.2 dB Eb/N0 -1.2 dB IW4DXW

0500 -

0530 -

0600 -

0630 -

 

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: 1/19/2019 3:50:50 PM

Subject: Re: LF: EbNaut

---

Hi Jay and all LF EbNauters,

Many thanks for your reports and suggestions.

And many thanks Jay for your efforts. Yes, indeed: so I'll try tonite with a half of symbol duration, pratically the same parameters used in my transmissions on 14/15 Nov. 2018:

QRG: 137545 Hz

Coding 8K19A

CRC 16

3 sec./sym.

6 characters

Duration: 28 min.

every 30 minutes, 1st transmission on 2100 UTC, last on 0700 UTC.

Reports are welcome as usual...

All the best

73 de Riccardo IW4DXW

Il giorno Sab 19 Gen 2019, 12:36 jrusgrove@comcast.net <jrusgrove@comcast.net> ha scritto:

Alex, Riccardo & EbNaut-eers

 

Unfortunately no copy of either station last night. Alex ... understand your TX frequency may have been moving around.

 

I wonder if a 1 hour transmission is too long for 137 kHz? Recalling spectrograms of QRSS going back many years seems to indicate a QSB pattern of approximately 15 - 30 minutes. Both receptions of IZ7SLZ and IW4DXW (a while back) were 'one and done' with no hint of the signal in adjacent time slots ... using 30 minute transmission times. Even DK7FC's normally big signal shows big QSB swings from one half hour period to the next. Can't help but wonder if 20 or 30 minute transmission periods make better use of the QSB characteristics on 136 kHz.

 

Comments?

 

Jay W1VD