[Lowfer] VLF Receiver Software, 8822 Hz still on

[N6IO]

Is using the TV horizontal oscillator still possible in the HDTV world?  If
you are using a receiver that converts HDTV to analog I'm not sure the
original HDTV clocking gets mapped to the newly generated signal.

A quick check shows two very stable signals  at 15734.3 hz and 15734.57 hz,
so maybe this still works?

Craig - N6IO



On Wed, Dec 17, 2014 at 12:29 PM, Todd Roberts via Lowfer <
lowfer at mailman.qth.net> wrote:
>
>
>
> I think it would be possible to use the common TV Horizontal Oscillator
> frequency
> of 15.734 kHz for an accurate standard frequency to calibrate your setup
> with?
>
>
> It is known to be accurate and can be heard in most places if you have
> any neighbors nearby that are watching their TVs. Perhaps your own TV would
> do as long as the signal is not too strong getting into your receiver.
>
>
> I can remember using the extremely weak carrier coming from a neighbor's
> TV set
> from somewhere down the street as a test signal for my own VLF receiving
> setup
> in the past.
>
>
> 73 - Todd WD4NGG
>
>
>
> -----Original Message-----
> From: N6IO <n6io at wasson.com>
> To: dexter.mc <dexter.mc at gmail.com>; Discussion of the Lowfer (US,
> European, &amp, UK) and MedFer bands <lowfer at mailman.qth.net>
> Sent: Wed, Dec 17, 2014 11:51 am
> Subject: Re: [Lowfer] VLF Receiver Software, 8822 Hz still on
>
>
> I got a very weak trace from about 0130 to 0330 here in the Washington DC
> area, but it showed up about 3Hz high.  Unless you were actually that far
> off I doubt it was you because both my SDR-IQ and my RTL-SDR seem to agree
> on frequency and this setup is usually good down to 0.1Hz.  I saw a local
> switching power supply on both receivers, but your signal only on the IQ,
> so it could have been some sort of intermod with a nearby AM station.  The
> two receivers are on different antennas so that could also explain the
> difference.
>
> Remind me again what kind of signal are you running?  QRSS, carrier, CW,
> etc?  I think my integration time is way too long to see anything so I need
> to adjust based on what modulation you are using.
>
> Can someone recommend a good narrowband signal in the 10-20kHz range to use
> to calibrate my setup?  It would have to be a pretty low data rate to
> provide an accurate frequency.  The time signal at 60kHz is too far off to
> confirm this specific setup is calibrated accurately.
>
> Thanks!
>
> Craig - N6IO
>
>
>
>
> On Wed, Dec 17, 2014 at 6:50 AM, Dexter McIntyre W4DEX <
> dexter.mc at gmail.com>
> wrote:
> >
> > Linux users interested in VLF reception may be interested in Paul
> > Nicholson's VLF software:
> >
> > http://abelian.org/vlfrx-tools/
> >
> > Paul is regularly detecting my 8822 Hz signal in Todmorden, England and
> > Germany with a possible detection in Italy.
> >
> > I left the 8822 Hz signal on overnight and it's still running stable at a
> > bit over 1 amp antenna current.  I plan to leave it on all day into the
> > evening.
> >
> > Dex
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