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Re: LF: EbNaut tests 137.490 kHz

from [Markus Vester] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: EbNaut tests 137.490 kHz
From: Markus Vester <[email protected]>
Date: Sun, 11 Dec 2016 11:16:02 -0500
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Sender: [email protected]
Thanks again Domenico, your receiver is doing an excellent job! Of course the SNR per bit is not really 71.6 dB, it's just an arbitrary number assigned to zero bit errors. But the carrier based SNR ~ 30 dB is probably realistic and proves the quality of your reception. 

Alex RN3AUS sent some opds data files from his Datcha, which produced good decodes as well. I'm working with Joe and believe that he will also be ready to receive EbNaut soon.

Unfortunately it started to rain this morning so I skipped the last transmission (7 UT) and pulled in the antenna. According to the weather forecast it will be a few days
before I can get on air again.

Thanks to all participants!

73, Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: Domenico IZ7SLZ <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 11 Dez 2016 4:57 pm
Betreff: Re: LF: EbNaut tests 137.490 kHz

Hello Markus & LF,

here the results of last DF6NM's EbNaut transmissions:

UTC    Eb/N0[dB]  BER[%]  carrier Eb/N0 [dB]  notes

18.00     18.1           0.2           19.9
19.00     14.7           2.3           14.9
20.00     71.6            0             23.5
21.00     71.6            0             26.4               Foff +0.0001 Hz
22.00     71.6            0             22.4
23.00     71.6            0             27.1
00.00     71.6            0             29.7
01.00     71.6            0             29.1
02.00     71.6            0             29.0               Toff +0.02s
03.00     71.6            0             27.1
04.00     71.6            0             26.4               Toff +0.02s
05.00     71.6            0             27.6
06.00       5.1          25             6.3                Foff +0.0001 Hz
07.00     NIL

All relevant wav files has been uploaded in the folder:  http://qsl.net/iz7slz/DF6NM.

73, Domenico iz7slz


..

On 10 December 2016 at 19:10, Markus Vester <[email protected]> wrote:

More EbNaut tonight:  Same 2 s/symbol format with hourly repeats starting 18 UT, but carrying a new 8-char message.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 9 Dez 2016 11:10 pm
Betreff: Re: EbNaut tests 137.490 kHz


To obtain some extra sensitivity, I have now slowed down to 2 seconds per symbol, with transmissions starting 0.3 s after each full hour.

Frequency 137490 Hz,
8 characters, 8K19A,
2 second symbols (duration 21m52s)
Start times: 22:00, 23:00, etc. until 7:00 UT, plus 0.3 s transmit delay.

73, Markus

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 9 Dez 2016 8:39 pm
Betreff: EbNaut tests 137.490 kHz

This evening I'll run some LF EbNaut tests again:

Frequency 137490 Hz,
8 characters, 8K19A,
1 second symbols (duration 656 seconds)
start times: 19:30, 20:00, etc, plus 0.3 s transmit delay

Best 73,
Markus (DF6NM)


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