Re: LF: K3RWR LF EbNaut

[Markus Vester <markusvester@aol.com>]

Hi Rob,

my preference would be to stay in the "Opera" subband 137.45 to 137.55 kHz, where a few of us are already running 24/7 SpecLab instances with "opds" data export. These files can easily be re-used to pick up  EbNaut transmissions of up to half-hour duration. Here in Europe, sharing the band with Opera and WSPR users has not caused significant issues yet. Recently LF Ebnauteers have often gathered on three spot frequencies, 137485, 137490 and 137495 Hz. Domenico IZ7SLZ has been running automatic EbNaut Decoders with various settings on these.

All the best,
Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: Rob Renoud <k3rwr@md.metrocast.net>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 25. Mrz 2018 22:05
Betreff: Re: LF: K3RWR LF EbNaut

Hi Markus,

Thanks for the decodes and information for the  Sat/Sun period!  Another strong showing reflecting the robustness of your RX station.

If I were to move to a different tx frequency within the 2200m band, are there better frequencies for you than my current 137.395 KHz?  The weather is much nicer now and I can retune the antenna tuning unit as needed.

Thanks again & 73,

Rob - K3RWR

On Mar 25, 2018, at 15:24, Markus Vester <markusvester@aol.com> wrote:

Hi Rob,

nice decodes again last night (Sat/Sun), but the wee hours were not as quiet as the night before:

180324-25
start Eb/N0
 UT    dB

0230   8.3
0330   3.1
0400   6.3
0430   9.5
0500   3.4
0530   2.9

Thanks Paul for pointing out my error regarding the wav file center frequency. It didn't affect the decodes and has been fixed now.

Let's see how the longer message will fare tonight...

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Rob Renoud <k3rwr@md.metrocast.net>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 25. Mrz 2018 1:45
Betreff: Re: LF: K3RWR LF EbNaut

Markus and LF EbNaut,

Wow!  Thanks for your reports and I’m very happy to see early success of EbNaut trials across the Atlantic on 2200m.

Gary, K3SIW, reported successful decodes at 21.94 dB, 9.8 dB and 12.61 dB. 

Jay, W1VD, reported a successful decodes with the best at 28.28 dB.

Paul, N1BUG, reported my carrier was “very strong” at his QTH.

I’m running the same message tonight at 1W EIRP.

Thanks to all for the reports & 73,

Rob - K3RWR

On Mar 24, 2018, at 19:34, Markus Vester <markusvester@aol.com> wrote:

Hi Rob,

got several valid decodes here in Nuremberg, best from the 5 UT transmission (screenshots attached). The signal was so strong that the spread PSK became visible in a spectrogram as a faint noise band.

Here's a list of all successful decodes between 22:00 and 6:30:

start  Eb/N0
 UT     dB
0100   3.3
0230   5.5
0300   1.7
0330   1.1
0430   9.9
0500  11.9
0530   4.6

Thanks Rob for the good work!

73, Markus
DF6NM in JN59NJ



-----Ursprüngliche Mitteilung-----
Von: Rob Renoud <k3rwr@md.metrocast.net>
An: RSGG_LF <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 23. Mrz 2018 16:08
Betreff: LF: K3RWR LF EbNaut

LF,

I am running trial LF EbNaut transmissions this weekend as follows:

Start Time: Currently Running
Stop Time: 25 Mar 1300 UTC
Freq: 137.395 KHz
Code Rate: 1/8K=19
CRC: 24
Symbol Period: 3 sec
Message Text: K3RWR
Characters: 5, Number of Signal Bits: 576
Duration: 00:28:48:00
Transmissions Start on Hour & Half Hour
Power: 0.5W EIRP

The objectives are to test my station transmitting equipment on EbNaut and asses all signal reports and decode reports. Note: I will be able to move to a lower frequency in the band once the weather improves and I can implement changes to the antenna tuning unit.

Reports and comments welcome!

Tnx & 73,
Rob - K3RWR FM18qi

<spectrogram_137k395_180325.png>