Re: [IRCA] Puyallup, WA Ultralight TP's for 10-12

[D1028Gary@xxxxxxx]

Hi Walt,
 
When I saw your report this morning, it sounded like we were DXing through  
different ionospheres!
 
This location is a notorious DU-dead zone (with only 738-Tahiti and a few  
weak Kiwis ever making it here over three years), so I'm not surprised that 
your  diverse DU-DX didn't show up at all here. But the fact that you had 
none of the  enhanced Japanese was really strange-- there seemed to be a total 
reversal  of propagation somewhere between us. Certain Japanese had 
freakishly strong  signals here, just like two days ago.
 
I'll paste Mark Connelly's comments on "chordal mode propagation"  
(originally on the Ultralightdx list) below. Yes, I'll be eager for tomorrow  
morning, also!
 
73, Gary
 
____________________________________________________________________________
___________
 
>From Mark Connelly: 
 
 I think you may have hit a case of "chordal mode" propagation just  before 
dawn fade-out when a tilt in the reflecting layer sends the signal  
"sideways" just below the arc of that reflecting layer as it stays roughly  
parallel to the earth's surface. When it intersects that arc towards the other  end 
of the signal path, you have avoided several lossy bounces off the earth.  
This causes a significant signal boost, typically for a short time interval  
(though obviously longer than meteor scatter on FM). Transmitting and 
receiving  antennas that have high angle patterns, usually poor antennas for DX, 
can  actually be quite effective. Spain on 1359 has such an antenna and can 
briefly  blast in here on the US East Coast at its local dawn, even though 
it is mediocre  most of the evening.

Mark Connelly, WA1ION



In a message dated 10/12/2010 9:36:30 P.M. Pacific Daylight Time,  
canswl@xxxxxxxxx writes:

Now that  is indeed VERY interesting, Gary.  You saw my report which  was
essentially 100% DU on many frequencies!  This occurred with  my
predominantly Asian corner-fed loop, and a DU oriented ALA 100.   I'll look
forward to tomorrow for sure!  ...Walt

On Wed, Oct  13, 2010 at 1:23 AM, <D1028Gary@xxxxxxx> wrote:

> Hello  All,
>
>     Yesterday's comatose TP propagation  gave way to  some of the 
strangest
> Asian conditions ever observed  here. Whereas Nick had  all-DU propagation
> this morning, here it  was strangely slanted toward the  Japanese, with a
> minor Korean  presence. The Chinese were shut out  completely, which led 
to
>  some
> bizarre receptions on certain frequencies.  It certainly  seemed like
> another
> example of "chordal mode"  propagation,  explained by Mark Connelly and 
Gary
> Deacon on the  Ulralightdx list two days  ago.
>     The biggest  surprise was tuning in to 738 kHz  around 1355 and 
finding
> a  station in (apparent) Japanese all alone, without a  trace of BEL2  or
> HKLG-- the usual occupants of the frequency. This mystery   station had 
the
> frequency all to itself for about 3 minutes, prior to  the 1400  TOH. On 
594
> kHz
> a moderate-strength JOAK was  joined by a co-channel at  1358, as the 
fairly
> rare 10 kw KBS1  station apparently made  its first appearance of the new
> season.  The 1400 TOH recording of 594-JOAK  produced a weaker set of time
>  pips
> before the 3 + 1 NHK pips, along with  Korean-sounding  speech from the 
same
> female voice observed last November, both   before and after the 1400 TOH.
> 1134 kHz had a vibrant JOQR all alone  on the  frequency, fighting the 
1130
> domestic splatter without  any Asiatic  competition. It usually is a poor
> third
> to  KBS and CNR1 this time of year  here, and was first heard alone  like
> this
> during the weird "chordal mode"  propagation  two days ago, as explained 
by
> Mark. Another strange signal  was  weak, lengthy instrumental music 
dominant
> on 639 kHz around  1350,  without any sign of CNR1's usual male-female
> Chinese, and  not // 594 kHz.  Although there were no ID clues or 
parallels
>  to
> check, this may have  been the 50 kw KBS3 station (possibly  heard here 
last
> week, under CNR1),  showing up with the same  instrumental music format. 
By
> 1407
> there was a mix on   738 kHz, as apparent Korean from HKLG joined the UnID
> Japanese--  still  with no sign of Taiwan's Chinese speech or pop music. 
The
>  mystery stations  on 738, 594 and 639 kHz this morning were not strong,  
but
> were easily  audible with headphones (which are recommended  for MP3
> listening). Even though  most of this morning's TP-DXing  action was at
> modest signal
> levels, compared to   yesterday's near-comatose band, it was a pretty
> thrilling  session.
>
>
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