Re: [IRCA] Updated frequency offset for Tonga?

[Chuck <charlesh3@xxxxxxx>]

According to http://www.febo.com/pages/hf_stability/ Doppler is 
non-existent except at sunrise and sunset, and even then it's only 
causing .5 Hz of error.

This doesn't take into account the occasional geomagnetic storm.

Chuck

On 7/28/2013 8:33 PM, Nick Hall-Patch wrote:
> I think the downside to using the higher frequencies is that they can 
> be quite badly Doppler shifted and smeared by propagation anomalies, 
> Walt, so that although they demodulate OK there isn't a single 
> frequency that you can accurately "hang your hat onto"  .
>
>
> best wishes,
>
> Nick
>
>
>
> At 02:46 29-07-13, you wrote:
> > Yes, I look for the 2 side bands, and I didn't see any, but correct, the
> > signal was not strong.  I calibrate the Perseus with WWV/H on 15 MHz 
> > .  I
> > had read that calibrating on a higher frequency is more accurate...Walt
> >
> > On Sunday, July 28, 2013, Nick Hall-Patch wrote:
> >
> > > How strong was the overall signal on 1160 at the time Walt?   When a
> > > signal is weaker, I find that the IBOC sidebands can drop below the
> > > noise/splatter level (I'm assuming that you were looking at the 
> > sidebands
> > >  on the Perseus display); I think they're about 30dB below the carrier
> > > strength.
> > >
> > > However, I could still hear IBOC this morning on 1147 and 1173 kHz at
> > > 1115UT, so I think something on 1160 is still cooking.
> > >
> > > best wishes,
> > >
> > > Nick
> > >
> > >
> > > At 17:42 28-07-13, you wrote:
> > >
> > >> I noticed no iboc this morning on 1160, though...walt
> > >>
> > >> On Sunday, July 28, 2013, Guy Atkins <atkinsguy@xxxxxxxxx> wrote:
> > >> > Thanks for the confirmation of KSL as a good calibration choice, 
> > Nick. I
> > >> > remember now that you and I talked about this station previously 
> > for
> > >> this
> > >> > purpose.
> > >> >
> > >> > 73,
> > >> >
> > >> > Guy Atkins
> > >> > Puyallup, WA
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