RE: LF: VO1NA in Todmorden on 8270 Hz

[jcraig@mun.ca]

Hi Jim,

This looks like a sin(x)/x curve centred and peaked (y=0.1) at t=0
and 0 crossings at t= +- 60 uS;  sd=300 nS.

Thanks & 73
Joe

On Sat, 7 Oct 2017, hvanesce@comcast.net wrote:

> 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
> > --