The world's most accurate clock

[Nan and Sandy Sanders]

On VLF most of the work is done on PCs with sound cards at 8.270 KHz 
running a program called Spectrum 
Lab      http://www.qsl.net/dl4yhf/spectra1.html 
https://sites.google.com/site/sub9khz/stations
      Sandy
      WB5MMB


At 07:09 PM 1/26/2014, Rob Seastrom wrote:

>That's a synchronization problem and I get that completely.  Great use
>case.  I think it's a little difficult for an LO...  or am I off in
>the weeds here?
>
>-r
>
>Nan and Sandy Sanders <radiodog77 at pobox.com> writes:
>
> > At lf and vlf there are some experiments going on with very long
> > integration times with fft windows in the uHz range with transmitters
> > and receivers locked to GPS or .MIL VLF transmitters. Not sure if
> > anything at HF needs to be that tight.
> >      Sandy
> >     WB5MMB
> >
> >
> > At 04:35 PM 1/26/2014, Rob Seastrom wrote:
> >
> >>Mike ODELL <mo at ccr.org> writes:
> >>
> >> > Alinco has a new(ish) "hybrid" HF+6 transciever (Classic analog superhet
> >> > with integrated what looks to be quality 24/192k quadrature ADCs
> >> > after the last mixer with USB connectivity) but the thing most 
> interesting
> >> > is provision for input from a GPS to discipline the Master Oscillator.
> >> > dunno if it has a 10MHz output but that would be nice.
> >>
> >>Are you referring to the DX-SR9T/E ?  I couldn't find anything about
> >>GPS-in and its stability is listed as 1 ppm, which is nowhere near GPS
> >>land... http://www.alinco.com/Products/DX-SR9/
> >>
> >>Do we really care that much about long term stability for the
> >>frequency of our signals, so long as the effects of oscillator ageing
> >>don't put us outside of where we're supposed to be transmitting?  I
> >>mentioned at the technical meeting earlier this month that GPS is
> >>fairly lousy for short term stability...
> >>
> >>http://www.febo.com/pages/stability/
> >>
> >>Is GPS slaving on HF radios just the equivalent of a wing and a big
> >>loud muffler on your car?
> >>
> >>-r
> >>
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