Re: [IRCA] Try Sleep Deprivation: TPs for 10/29

[Nick Hall-Patch <nhp@xxxxxxxx>]

At 15:27 29/10/2006, you wrote:
>I've become more and more curious about the excellent TP reception
>that I've been experiencing when I'm up 90 minutes or more before
>dawn.... more than 30 minutes before First Light.  I don't think that
>I completely understand Nick's explanation of this propagation that
>he uploaded yesterday, but I decided to try REALLY early this AM.


Hmmm.....I don't know that I provided an explanation, John, merely an 
observation.  The explanations will have to come from people who 
really know about this stuff; I'm afraid I'm just the messenger until 
brain transplants are a bit more reliable, hi.

With that in mind, I've uploaded a couple of traces of 594 kHz 
recorded here to http://www3.telus.net/7dxr/4john/594.pdf

One is from yesterday morning (28th), the other this morning (29th).

The trace for the 28th illustrates what I was talking about before 
pretty clearly I think.   The signal from Japan pokes up around 0700, 
before Tokyo sunset at 0750UT, increases in strength until around 
1000UT , then fades back and stays pretty steady until if fades out 
with our sunrise, with not much sign of dawn enhancement.  (halfway 
between the signal first showing up and its final fade out at about 
1500 would be nearer 1100UT however)  This sequence seems to be more 
normal for late fall here for lower frequency Asians, though signals 
can be stronger than observed on the 28th.  The weakish signal 
overnight followed by a good boost at sunrise seems more common in 
the fall and spring; on the higher medium frequencies, the boost at 
sunrise model seems more likely through the winter months as well .

If you look at the better overall strength on the 29th compared to 
the 28th, Bill Block's observations seem to have been right on the 
money...yesterday, pretty poor, today pretty good,    But Bill heard 
that just at sunrise, John heard it at 1200, and a good level can 
certainly be seen at that time on the trace for the 29th.

594 did have a good enhancement from 1400 to 1420UTC in the 
northwest.  Judging from John's, Walt's and Colin's comments (me, I 
got two extra hours of sleep last night, so wasn't part of the 
action), this peak was either heard only on my monitoring system 
(based on tuned passive loop antennas), or was limited to 594's 
signal. Or...the DXers were doing most of their sunrise listening 
after 1420UT.  Unfortunately, I can only monitor a limited number of 
frequencies, and 594 is used as my low band East Asia indicator, so 
can't speak of other channels except for 612, which did have a true 
sunrise peak, just so Walt could catch them at 1500UT.


best wishes,

Nick









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Nick Hall-Patch
Victoria, B.C.
Canada

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