Date: Thu, 14 Feb 2019 14:11:03 -0330 (NST)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <5C648CA9.90600@posteo.de>
Message-ID: <Pine.LNX.4.64.1902141357270.31354@plato.ucs.mun.ca>
References: <CAC+C6w521S1Z2P59riMk3M3gxZ+Jj5MEwfCPBmA9Z6-CddugtA@mail.gmail.com>
 <Pine.LNX.4.64.1902071235480.9386@plato.ucs.mun.ca>
 <Pine.LNX.4.64.1902071306380.9507@plato.ucs.mun.ca>
 <CANA3B6XJkgxPcktLkrYxNK6nVaTWs6Sp7Yux+-bMfohXfOT_oA@mail.gmail.com>
 <5C616B8E.6000302@posteo.de> <Pine.LNX.4.64.1902111610030.4511@plato.ucs.mun.ca>
 <CANA3B6USAhFvdZoL7AcZoKn56nzYfNJPf7dzfE-u7Ca4vkgS2w@mail.gmail.com>
 <Pine.LNX.4.64.1902131632410.23275@plato.ucs.mun.ca> <5C648CA9.90600@posteo.de>
MIME-Version: 1.0
Subject: Re: LF: VO1NA Ebnaut recently decodes
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

Greetings Stefan and congrats on your remarkable work on ELF.
I am still thinking about the guard rail for VLF.  It is 10km+ from the
shack so any operation will have to be mobile and of courss must
have the prior approval of Elmer the Safety Elephant. (hi hi)

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.

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.

73
Joe VO1NA

On Wed, 13 Feb 2019, DK7FC wrote:

> Hello Joe,
>
> Your NEO7M emits 137 kHz directly? How do you tell it to do that?
> Ehm, did i ask you the same question some weeks ago or did i just thought 
> that i should ask you.
> Ebkey, so your'e using a Raspi for the job? I think so but maybe i remember 
> wrong.
> Would be interesting to know your rig in detail, the exciter stage.
>
> 73, Stefan
>
> PS: Do you know, there are such forums, when you ask a question then someone 
> answers "This question has been asked before. Did you run a search 
> before?...". Terrible!
>
> Am 13.02.2019 21:15, schrieb jcraig@mun.ca:
>> Hi Riccardo, Group.
>> 
>> Thanks for the details of your experiments and the signal reports.
>> The set up here is an NEO7M to a Decca (one PA module) to a 100x20m
>> RL aerial. Paul's Ebkey.c clocks the XOR. The RL has several dB over
>> the monopole. Perhaps running a counterpoise under the top loading wire may 
>> yield another dB or 2.  Stefan's and Markus's grabbers are
>> very helpful too.
>> 
>> 73
>> Joe VO1NA
>> 
>> On Wed, 13 Feb 2019, Riccardo Zoli wrote:
>> 
>>> Joe, Stefan, LF
>>> 
>>> Another night with a strong signal from you, Joe. Thanks again for your
>>> transmissions which provides good opportunities for RX equipment testing.
>>> Last night, in particular, I tried to listen your signal with my *SLMS
>>> HP-3746A*, equipped with its high stability oscillator (OPT.014). I have
>>> got good decodes with *NO GPS* *reference* connected to audio card or
>>> instrument; I noticed only a slight phase rotation in a couple of cases.
>>> I used my TX inv. "L" antenna (that was tuned this time) and a 6 dB
>>> attenuator.
>>> You can see here the results:
>>> 
>>> UTC   Eb/N0[dB] Carr.S/N[dB] Mess.
>>> 0030 7.1  32.14 *******
>>> 0100  8.0  32.20 VO1NA_R
>>> 0130 5.2  29.08 *******
>>> 0200 4.0  27.95 VO1NA_R
>>> 0230 5.7  29.01 *******
>>> 0300 3.3  27.79 VO1NA_R
>>> 0330 NIL    -              -
>>> 0400 9.0  32.46 VO1NA_R
>>> 0430 7.3  31.49 *******
>>> 0500 6.2  30.55 VO1NA_R
>>> 0530 6.1  29.86 *******
>>> 0600    -0.3  24.48 VO1NA_R
>>> 
>>> 
>>> All the best
>>> 
>>> 
>>> 73 de Riccardo IW4DXW
>>> 
>>> 
>>> 
>>> Il giorno lun 11 feb 2019 alle ore 21:05 <jcraig@mun.ca> ha scritto:
>>> 
>>>> Hi Riccardo, Stefan, LF,
>>>> 
>>>> Pleased to get your report of improved signal strength Riccardo.
>>>> The R means "Rotated L" so it is in the sky again since yesterday.
>>>> Today a cermaic feedthrough was installed on the PVC bucket
>>>> that houses the coil. It was cold (-10 C) today but the work had
>>>> to be done; there was too much charring and arcing.  All seems OK
>>>> now and the TX is on (one Decca module) 2.2A RF
>>>> 
>>>> 73
>>>> Joe VO1NA
>>>> 
>>>> On Mon, 11 Feb 2019, DK7FC wrote:
>>>> 
>>>>> Hello Riccardo,
>>>>> 
>>>>> I like the precision of your RX frequency. I should add a few nulls to
>>>> my
>>>>> file too :-)
>>>>> Good work regarding Joe's reception!
>>>>> 
>>>>> 73, Stefan
>>>>> 
>>>>> Am 11.02.2019 12:56, schrieb Riccardo Zoli:
>>>>>> 
>>>>>> Joe, LF
>>>>>> 
>>>>>> Very strong signal last night continuously from 2330z to 0530z.
>>>>>> Best decode at 0300z, info attached.
>>>>>> RX setup: inverted "L" TX antenna (slightly detuned, 6 dB attenuator
>>>>>> inserted) and SDR.
>>>>>> 
>>>>>> All the best,
>>>>>> 
>>>>>> 73 de Riccardo IW4DXW
>>>>>> 
>>>>>> Il giorno gio 7 feb 2019 alle ore 17:44 <jcraig@mun.ca
>>>>>> <mailto:jcraig@mun.ca>> ha scritto:
>>>>>>
>>>>>>     Apologies: I misspelt Domenico and did not acknowledge Riccardo's
>>>>>>     autodetector.
>>>>>>     73
>>>>>>     Joe
>>>>>>
>>>>>>     On Thu, 7 Feb 2019, jcraig@mun.ca <mailto:jcraig@mun.ca> wrote:
>>>>>> 
>>>>>> > Dominico,
>>>>>> >
>>>>>> > Thanks to you and Markus and Domenico for the autodecoder service.
>>>>>> > I will check the modulator and try again tonight. Some antenna
>>>> work
>>>>>> > is planned as well when the wx improves so there should be some
>>>> more
>>>>>> > dB available soon.
>>>>>> >
>>>>>> > 73
>>>>>> > Joe
>>>>>> >
>>>>>> > On Thu, 7 Feb 2019, Domenico IZ7SLZ wrote:
>>>>>> >
>>>>>> >> Joe, LF
>>>>>> >> in my EbNaut log
>>>>>> >> *https://qsl.net/iz7slz/EBNAUT/DECODED.TXT
>>>>>> >> <https://qsl.net/iz7slz/EBNAUT/DECODED.TXT>*
>>>>>> >> there are some decodes of your EbNaut of last nights (QRB=5426
>>>>>>     km). Seems
>>>>>> >> that since yesterday, only carrier is sent on usual qrg 137477
>>>> Hz.
>>>>>> >> Autodecoder here is now running, every XX:00 and XX:30 on Joe's
>>>>>>     parameters:
>>>>>> >>
>>>>>> >> 137477.000Hz N=7 T=3s 8K19A CRC=16 list=2000 sym=608
>>>> Duration=1824s
>>>>>> >> T_OFFSET=0.0s F_OFFSET=0.000Hz
>>>>>> >>
>>>>>> >> 73, Domenico IZ7SLZ / JN80nu
>>>>>> >>
>>>>>> >
>>>>>> >
>>>>>> 
>>>>> 
>>>> 
>>>> 
>>> 
>> 
>
>