2 meter Aircraft Scatter experiment using OPERA #opera


Graham
 
Edited


Interesting   2 meter  Aircraft Scatter  experiment  in  southern  Spain 

Posted by EA5GZY & EB5AL

Using  Opera and   'Air Scout   predicting  software ,
Reliable 200 miles +decodes where  achieved , using 
2 meters , 

Link to the  full  article , below 

Being  free  running ,  the  optimum  Tx  time  can be  selected 

Data loss  during  the  transmission  , shows as  6 %  , eg , the 
system  was recovering  94% of the  data  burst , indicating the 
Tx timing   to  be  accurate 

NB-  New  versions  of  OPERA have   single  speed  set  for  each band
Mode  Op05 is  set  for  VHF  2  meters and  above . 

73-Graham
G0NBD




Terrain and  heading  predictions 





Posted by EA5GZY & EB5AL



opera download ........


Graham
 
Edited

Short Aircraft Scatter  test   G0NBD <> G6AVK
Range  ~ 200 miles  , 2  meters 
using  Opera op05  [30 second]

Tx.Rx actually  stable,  Opera is  showing the  average frequency over the  TX period 

AFC action can be  seen working as  data lost  [ % Fade] is  showing 
from 0 to 6% 

73-Graham
G0NBD

 

20:43 144180 G0NBD de G6AVK Op05 199 mi -19 dB F:3% in Essex, JO01ho 1500.0 Hz
20:40 144180 G0NBD de G6AVK Op05 199 mi -18 dB F:2% in Essex, JO01ho 1503.9 Hz
20:30 144180 G0NBD de G6AVK Op05 199 mi -15 dB F:3%_Ini in Essex, JO01ho 1500.0 Hz

20:14 144180 G0NBD de G6AVK Op05 199 mi -18 dB F:3% in Essex, JO01ho 1492.2 Hz

20:13 144180 G0NBD de G6AVK Op05 199 mi -16 dB F:3% in Essex, JO01ho 1527.3 Hz

20:11 144180 G0NBD de G6AVK Op05 199 mi -19 dB F:3% in Essex, JO01ho 1511.7 Hz

20:05 144180 G0NBD de G6AVK Op05 199 mi -21 dB F:2% in Essex, JO01ho 1511.7 Hz

20:04 144180 G0NBD de G6AVK Op05 199 mi -16 dB F:7% in Essex, JO01ho 1511.7 Hz
20:03 144180 G0NBD de G6AVK Op05 199 mi -19 dB F:0% in Essex, JO01ho 1515.6 Hz
2
20:02 144180 G0NBD de G6AVK Op05 199 mi -19 dB F:2% in Essex, JO01ho 1515.6 Hz

20:01 144180 G0NBD de G6AVK Op05 199 mi -15 dB F:6% in Essex, JO01ho 1507.8 Hz

19:54 144180 G0NBD de G6AVK Op05 199 mi -16 dB F:3% in Essex, JO01ho 1507.8 Hz



Spec-lab  plots , showing  multiple reflections  and  doppler  shift 
taken by  G6AVK