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

["Alan Melia" <alan.melia@btinternet.com>]

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

To: rsgb_lf_group@blacksheep.org

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

To: rsgb_lf_group@blacksheep.org

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

To: rsgb_lf_group@blacksheep.org

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'

 

 

 http://rosmodem.wordpress.com/