Re: LF: VO1NA Ebnaut recently decodes

[Domenico IZ7SLZ <iz7slz.domenico@gmail.com>]

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