Date: Tue, 10 Oct 2017 19:36:16 -0230 (NDT)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <15f0837d195-c0b-19141@webjas-vac174.srv.aolmail.net>
Message-ID: <Pine.LNX.4.64.1710101924510.12402@plato.ucs.mun.ca>
References: <15f0837d195-c0b-19141@webjas-vac174.srv.aolmail.net>
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Subject: Re: LF: VO1NA in Todmorden on 8270 Hz - also in Amberg?
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Hello Markus,

Yes, the TX is QRV 10 uW on 8370.00709 Hz +- QRI a few ppb and has been on=
=20
since 4 October. This is exciting news. Let's hope it appears again.

Best Regards
Joe

On Tue, 10 Oct 2017, Markus Vester wrote:

> Joe, have you also been on VLF yesterday Oct 9th? There seems to be a sma=
ll dash on your frequency on the DL0AO grabber (EW earth-loop, 31.4 uHz, 1 =
hour scroll).
> http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm
> (unfortunately the 31 uHz instance has been restarted today but the dash =
is still visible).
>
> Best 73,
> Markus
>
>
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: Markus Vester <markusvester@aol.com>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Sa, 7. Okt 2017 23:57
> Betreff: Re: LF: VO1NA in Todmorden on 8270 Hz
>
>
>
>
>
>
> Hi Joe,
>
> good to know that you are on air again. The DL0AO grabber in Amberg (East=
 Bavaria) includes your frequency in one of the 31 uHz instances.
>
>> Yes, the high wire for 630m (~5 W EIRP) and the low for 36000m.
> Shouldn't that be the other way round, maximizing the important VLF radia=
tion ? ;-)
>
>> Yes, pps and NMEA to SpecLab but evidently no discipline yet
> Getting the SpecLab samplerate detector to work will lock your frequency =
but not the phase. To avoid the risk of phase jumps due to soundcard glitch=
es or buffer underruns, I would then strongly recommend to set up the softw=
are PLL with audio feedback from a pickup probe. This method also has the a=
dvantage of maintaining absolute phase despite variations in the antenna ci=
rcuit. But I have to admit that setting up SpecLab that way is a bit more i=
nvolved, especially when you also want to apply PSK modulation for EbNaut.
>
> With the programmable ourtput frequency from the NEO7, you may have two o=
ther, simpler options:
> - You could tell the NEO to output the desired transmit frequency directl=
y. For EbNaut, you can later add the traditional XOR or balanced mixer circ=
uit.
> - You could use the NEO with high frequency output as a clock source for =
your DDS. EbNaut could be generated either by XOR or by manipulating the DD=
S phase word.
>
> Best wishes,
> Markus
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: jcraig <jcraig@mun.ca>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Sa, 7. Okt 2017 18:46
> Betreff: Re: LF: VO1NA in Todmorden on 8270 Hz
>
>
> Paul Markus and Group,
>
> Thanks Paul for the reports. The radiation gives more gratification than =
the efforts to get a stable carrier.
>
> On Sat, 7 Oct 2017, Markus Vester wrote:
>
>> Great result!
>
> Truly astounding that Paul can receive 10 uW at 3600km with 10+ dB S/N.
>
>> Hmm I thought that VO1NA had been on 477 kHz during those nights. Joe ar=
e you transmitting MF and VLF simultaneously, on two antennas?
>
> Yes, the high wire for 630m (~5 W EIRP) and the low for 36000m.
>
>> Do you already have GPS lock available on 8.27 kHz?
>
> Yes, pps and NMEA to SpecLab but evidently no discipline yet. The pps pul=
se looks strange on the SL scope and there are 'PPS zero-crossing too
> flat' debug errors on SL SR correction. This is all the NEO7M seems willi=
ng to provide at the moment; connecting the raspi3 to the tiny USB
> pins on the NEO7M was fun, but otherwise unproductive. I'm hoping it's po=
ssible to send commands directly to the neo7m via usb without a special chi=
p.
>
> RSNTP is running on the SL pc.
>
> 73
> Joe
>
>>
>> 73, Markus
>>
>>
>>
>> -----Urspr=C3=BCngliche Mitteilung-----
>> Von: Paul Nicholson <vlf0403@abelian.org>
>> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
>> Verschickt: Sa, 7. Okt 2017 10:36
>> Betreff: LF: VO1NA in Todmorden on 8270 Hz
>>
>>
>>
>> VO1NA on 8270.00709 is a good nighttime signal at Todmorden
>> recently. Here are the last three night's spectra in 34.72 uHz
>> (8 hours 23:00 to 07:00 UT) using combined E-field and H-field.
>>
>> http://abelian.org/vlf/tmp/171007b.gif S/N 12.6 dB
>> http://abelian.org/vlf/tmp/171007c.gif S/N 14.5 dB
>> http://abelian.org/vlf/tmp/171007d.gif S/N 11.4 dB
>>
>> Not bad for 8uW ERP at range 3575 km and an undisciplined
>> OCXO.
>>
>> --
>> Paul Nicholson
>> --
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