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Re: LF: New Version OPERA , with FADE graphical indication

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Subject: Re: LF: New Version OPERA , with FADE graphical indication
From: "Graham" <[email protected]>
Date: Wed, 2 Oct 2013 23:55:14 +0100
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Alan,
 
Yes  close in , it will  be  deeper , notably  the  signal  levels  -23  and  -24  are  very  close ,  those levels  are the  average   along the  4 min  time  line ,  we  dont  have the  actual  plots , those  are  only  available   at the  local  station
 
In the  case of  op32  the  'dots'   are  referenced  to    -35 dB  s/n  , hopefully  there  will  be  some  long  range  decodes in the  near  future ,   if the  decode  stations  could post the  plots , that  would be useful 
 
 
73 -G,
 
 
 
 

22:26 136 SM6BHZ Op32 -28 dB |---------------------------------- ----- ---- -------- ------ ------------------------------------------| Fade: 17%

21:10 136 SM6BHZ Op32 -35 dB |-- - ---------- ------------- -------------- - ---------------- - ----- ----------------------------| Fade: 24%

 

From: Alan Melia
Sent: Wednesday, October 02, 2013 10:32 PM
Subject: Re: LF: New Version OPERA , with FADE graphical indication

Hi Grahan that would seem to follow the fade at 300mi is probably due to groundwave. This is a lot weaker at 1000mi and the skywaves are relatively stronger. The depth of the fade is a function of the strength of the two paths whose relative phase is changing. If the amplitudes are equal then there is a total "wipeout" ....I guess 10% fade says one path is 20dB stronger than the other.
 
Alan
G3NYK
 
----- Original Message -----
From: Graham
Sent: Wednesday, October 02, 2013 10:04 PM
Subject: Re: LF: New Version OPERA , with FADE graphical indication

Long  range DX  1000  miles  , has less  Fade  than  short  330  miles  , ?
 
 
IZ7SLZ de SWL-G6AVK (England): Op4 1078 mi F:10% -24 dB in Essex with 50w + Inverted-L
 

PA3ABK de SWL-G4WGT (England): Op4 331 mi F:21% -23 dB in Chorley, IO83qo with 40w +

 
 
 
 

From: Graham
Sent: Wednesday, October 02, 2013 9:53 PM
Subject: Re: LF: New Version OPERA , with FADE graphical indication

 
New data  added  to the  web linked  reports  as  well ,  this  showing   10% of the  signal was  'not  decoded' and  at   -24 dB  would  support  a   ROS-MF-2
  'rtty'    qso 
 

IZ7SLZ de SWL-G6AVK (England): Op4 1078 mi F:10% -24 dB in Essex with 50w + Inverted-L

G,
 
 
 
 

From: Graham
Sent: Wednesday, October 02, 2013 7:50 PM
Subject: LF: New Version OPERA , with FADE graphical indication

New Version OPERA , with FADE  / Time line  recording
 
Latest  version provides a graphical  indication  of the  QSB/Fade  on the  signal  along the  time  line
with a  % Fade  indicated  for  each  decode  , all  other  functions   remain as  previous  issues 
there is  no  change to the  Tx format 
 
 
There seems  to be a  problem  using  IE  to  download  at the  moment  , FireFox  or Chrome  are 'ok'
 
 
 
 
 
 
 
 
 
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