From: <hvanesce@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <d4435cf7-7279-4804-4983-7c32916555b4@abelian.org> <15ef65e747f-c05-19293@webjas-vac135.srv.aolmail.net> <Pine.LNX.4.64.1710071346210.1307@plato.ucs.mun.ca>
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Date: Sat, 7 Oct 2017 13:16:20 -0400
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Subject: RE: LF: VO1NA in Todmorden on 8270 Hz
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Joe,

Did you try the "[0] Interpolated PPS signal" option?
("Sampling Rate Detector" window, "Scope Option" drop-down menu)

73,

Jim AA5BW
  

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of jcraig@mun.ca
Sent: Saturday, October 7, 2017 12:44 PM
To: rsgb_lf_group@blacksheep.org
Subject: 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 are
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 pulse
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 willing 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 possible to send
commands directly to the neo7m via usb without a special chip.

RSNTP is running on the SL pc.

73
Joe

>
> 73, Markus
>
>
>
> -----Ursprüngliche 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
> --