Date: Sat, 16 Feb 2019 17:08:48 -0330 (NST)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VO1NA Ebnaut recently decodes
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OK On the mains failure, Domenico. I have been reading on receiving
EbNaut and hope to receive again soon.  Thanks for the reports and
the autodecoder.

73
Joe

On Sat, 16 Feb 2019, Domenico IZ7SLZ wrote:

> Hi Joe, LF
>
> Your EbNaut got one error free decode last night here in JN80nu using
> nominal values for time and frequency offsets:
>
> ------------------------------------------------------------------------------------------
> 2019-02-16_01:00:00 137477.00Hz N=7 T=3s 8K19A CRC=16 list=2000
> sym=608 Duration=1824s
> T_OFFSET=0.0s F_OFFSET=0.000Hz
> initial reference phase -29.6 amplitude 1.424e+01
> carrier phase: 1.5 deg
> carrier Eb/N0: 22.6 dB
> carrier Es/N0: 10.74 dB
> carrier S/N: 38.58 dB in 548.2 uHz, 5.96 dB in 1Hz, -28.01 dB in 2.5kHz
> found rank 0 ber 0.0000e+00 Eb/N0 71.8 M -3.575119629e+02 ph 1
> 180,180,180,180 [VO1NA:R]
> ------------------------------------------------------------------------------------------
>
>
> Other auto-decodes are logged at
> https://qsl.net/iz7slz/EBNAUT/DECODED.TXT
> There was a mains outage at the receiving site on Feb 14, so i have missed
> unfortunatly LF transmissions of 14 and 15 february. Sorry.
>
> Thank you for the signal Joe. Propagation peak for our path seems to be
> around 01.00 UTC.
> Maybe be you can be ready for receiving so we can attempt an exchange of
> calls/report before the season ends ?
>
> Vy 73 to all, Domenico IZ7SLZ
>
> On Thu, 14 Feb 2019 at 19:44, DK7FC <selberdenken@posteo.de> wrote:
>
>> Hello Joe,
>>
>> Am 14.02.2019 18:41, schrieb jcraig@mun.ca:
>>> Greetings Stefan and congrats on your remarkable work on ELF.
>> Thank you. A 100 character message is running since 12 UTC. It will take
>> almost 4 days to pass it over. The longest message (in hours, not in
>> characters) ever sent in EbNaut, if i remember correctly :-)
>>> I am still thinking about the guard rail for VLF.  It is 10km+ from the
>>> shack so any operation will have to be mobile
>> Hm maybe you can send me the most accurate locator of your shack, like
>> Dimitris did with his house? It would be interesting to see your
>> location. Hay, we know each other since almost 10 years now but don't
>> know very much actually ;-) I remember our DFCW-3 QSO on 137.7 kHz at
>> night, some years ago.
>>
>>> EbNaut LF TX: The signal is taken from the time pulse output of the
>>> NEO7 board
>>> which has a LED and dropping resistor across it. Paul has written
>>> code to control the frequency, duty cycle etc with a Raspi.  Very handy.
>> Yes, i'm using his tools too. Setting the time pulse works well but
>> setting a frequency does not, somehow. Am i making a stupid mistake or
>> does it have to do with the serial interface /dev/ttyAMA0 on a Raspi2B
>> (unlikely) or is my module missing something. Oh no, i remember i
>> successfully set a frequency output with the u-center software.
>> Need to try Markus' fresh developed tool for Windows, just to check if
>> it works.
>>
>> I would like to use a Raspi and Ebkey (using a XOR gate for the PSK) to
>> run an EbNaut message from a Raspi. With just 5 W TX power (the
>> classical QRP power level) i could pass a message over to Paul, when
>> TXing at night, from a small battery. That would be a great test that
>> could be done quite often and i don't need to have my car there and big
>> batteries. What a fun!
>>
>>> This goes directly to a TTL XOR and then a TC4426 driver thence a
>>> class E 100w TX or the Decca.  If you have any questions, I'll be happy
>>> to help.  This system is very simple.
>> Thanks Joe, I'll come back later to you. I'll try again and then pass
>> the command lines into this email, just for your confirmation.
>> 73, Stefan
>>
>>
>