Re: [IRCA] Trying to figure something out...

[Nick Hall-Patch <nhp@xxxxxxxx>]

Late reply on this Paul.  Down south (i.e. here), there seem to be 
periods around the equinoxes when signals from east Asia and Oceania 
peak near local sunset at the transmitter, and also at local sunrise 
at the receiver.   There is speculation that low loss ducting between 
E and F layers of the ionosphere might be involved, with the 
ionosphere tilting at the terminator to accept or deliver high angle 
signals.  I wonder if that is happening in your case?

Of course, at this time of year, Asians heard here seem more likely 
to peak when there is maximum darkness between the transmitter and 
receiver, with occasional instances of sunset/sunrise peaks, and 
these seem unpredictable.

best wishes,

Nick




At 17:44 25-11-16, Paul B. Walker, Jr. wrote:
> ... One of my regular visitors is AFN 810 The Eagle from Yokota Air Base in
> Japan, with 50,000 watts.
>
> The signal can be quite good at times, but it doesn't last too long and
> fades out to mush but often comes back
>
> Also, it peaks about an hour before local sunset (sunrise is 1930UTC) and
> is gone just as the sun begins to rise.
>
> I know what it starts to break up at sunrise, that's obvious.. but it's
> never really present before 1830UTC, why is that? It's still dark in Japan,
> barely past Midnight local time, so one would think I could hear it well
> when it's dark in both places.
>
> Also why does the signal take such dramatic dives? Those dives happen
> everyday.
>
> I'm sure there's a reason for this and with the extreme cold I'm now
> dealing with, I just like to figure this out so I can figure otu the best
> times to go out and maximize the signal I hear/can get.
>
> Paul Walker
> Galea, Alaska
> Lower HF225
> Grundig SAttelit 750
> Two 225 foot long wires
> WEllbrook ALA1530LNP
> DXEngineering HF PreAmp
> 3 antenna coax switch
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Nick Hall-Patch
Victoria, BC
Canada 

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