Some points Mike

200%F  is  a  bodge to get the  text  beacon via   the  server , not
showing  in my  latest  spot listing ?

JA8SCD de SWL-JA8SCD/1 (): Op32 0 mi -41 dB in Tokyo with 0w +
16:29    136 JA8SCD de JA8SCD/1 Op32 Deep Search 0 mi -41 dB in Tokyo with
0w +

4 Min processing  delay  showing  in these  detection's

16:15    136 LA3EQ de G4WGT Op32 Deep Search 468 mi -43 dB in Chorley,
IO83qo, with 0.2w + Marconi-T
16:11    136 LA3EQ de G8HUH Op32 605 mi -34 dB F:15% in Somerset with 0.2w +
Marconi-T

Nothing  can be  100% ,   Dynamic   detections ,  will  show   1
minuet after  conventional OP8   and   4  minuets   after  a
conventional  OP32  decode , this  is due  to  data  processing  time
and  is a  fixed  off  set  , Time can be  used  as  a reality  check

There  are now  two  entirely  different  systems  packaged  in the  one
application ,  the  original Opera  data  mode , which is   capable  of
presenting  the  fade pattern  and  the  s/n ,  the  other  relies  on  call
matching  and  presents  s/n only  , hence  the  'odd' 200%F  , the  dynamic
search has been trailed  on  normal  'ham' kit and  provides an extension to
the  existing  system .

Before  any  variations  are  attempted ,  off  air  stats  are needed ,
there  was  close  to  100  instances  of  V155  in use  since  its  launch
,  with  only  1 error  that  would be   1% . Occurrences  will  be
statistically  related to  user  numbers

Where  it  is  unfortunate   'real'  calls  are  produced  , the  time
delay  presents a  simple , at a glance spot-check , the integrity of the
original  system has not  been  compromised, at the  moment  the list

cycle ,  8  provides overlap

73-G,



--------------------------------------------------
From: "Mike Dennison" <[email protected]>
Sent: Wednesday, January 07, 2015 3:37 PM
To: <[email protected]>
Subject: Re: LF: New version  OPERA  >>  ''Opera Dynamic'' <<

Sorry, Graham, but you are wrong. Last night's results did not "give
a good working compromise between real and false detections." There
were several very plausible but false decodes. These appeared much
more frequently than they do on OPDS which in any case gives enough
additional information on signal quality to be able to spot most
false decodes. It's a nice idea, but the real/false threshold is set
much too far towards 'real', making the resultant information next to
useless.

And what is the "200%" fade figure all about? I am 1000% sure I don't
know.

Mike, G3XDV
==========

All,

Other  than  the  odd  false  spot , that looked to  be  quite  a
good  launch  for the  new  addition  to  Opera

Nothing  can be  100% ,   Dynamic   detections ,  will  show   1
minuet after  conventional OP8   and   4  minuets   after  a
conventional  OP32  decode , this  is due  to  data  processing  time
and  is a  fixed  off  set  , Time can be  used  as  a reality  check
.

Dynamic  compares   Call Signs  with  activity , to provide  the
lowest  possible  detection  levels , to  do  this  ,  Opera  changes
mode  to  give  a  second  chance  detection , based on  s/n , The
detection  threshold has been  set  to  give a good  working
compromise between  real and  false detections.

 Noting , each individual transmission is  processed  independently ,
 Conventional  and Dynamic  processes  are    running  in parallel

73-Graham
G0NBD










From: Graham
Sent: Tuesday, January 06, 2015 8:38 PM
To: [email protected]
Subject: LF: New version OPERA >> ''Opera Dynamic'' <<


New  version  of  opera  up-loaded

Opera Dynamic: Introduces   the  first, adaptive  multi mode  Beacon
decoding/detection  system , seamlessly  taking over from   the  Opera
data  decoder  and  dynamically configuring  the  low level  detector.



Opera Dynamic  is  configured  for  MF OP8  and  LF OP32   , providing
 a dynamically   configured  low  level  detection  mode ,
complimenting  the  Opera  Data mode ,



Opera Dynamic  forms  part  of  the  windows  distributed  package ,



73-Graham

G0NBD





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