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Re: LF: New version OPERA >> ''Opera Dynamic'' <<

To: <[email protected]>
Subject: Re: LF: New version OPERA >> ''Opera Dynamic'' <<
From: "Graham" <[email protected]>
Date: Wed, 7 Jan 2015 19:55:02 -0000
Importance: Normal
In-reply-to: <[email protected]>
References: <[email protected]>, <[email protected]>, <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Beginner's   luck  Mike   : )

Time is the enemy , the longer the rx is running , the higher the chance of something being spotted , monkeys and keyboard syndrome .. just these have a liking for calls' hi
Unless there are 2 decodes of the same call , its not possible
for a call to be added to the look up list , but once in, yes its
possible to have it wrongly detected , though , as noted , Time can
be used to check the validity , along with the psk-map data base ,
TX beacons are stored as well as decodes .

19:44 477 PA3ABK de G0NBD Op8 Deep Search 344 mi -36 dB in Liverpool with 0.5w + Marconi lin. loaded top 45m total 19:43 477 PA3ABK de G0KTN Op8 306 mi -6 dB F:13% in Bath, UK IO81 with 0.5w + Marconi lin. loaded top 45m total
Something tells me , I have a problem with the RX at the moment -36
db is a touch on the low side , but demonstrates the 1 min delay for
OP8 on 477k
73-G,

--------------------------------------------------
From: "Mike Dennison" <[email protected]>
Sent: Wednesday, January 07, 2015 5:43 PM
To: <[email protected]>
Subject: Re: LF: New version  OPERA  >>  ''Opera Dynamic'' <<

Graham, thanks for the useful info. I have sent you a direct email
with some constructive suggestions.

One snag with false decodes of this type is that you don't know they
are false unless the sender denies he was sending (or propagation is
impossible) at that time, so there will be statistically far fewer
reports of false decodes than there are in reality. I transmitted
four times in the last 24 hours and there were two additional decodes
falsely carryng my callsign in the same period. That's two out of a
total of six, ie 33%.

regards
Mike
=====

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

17:23    136 LA3EQ de GW0EZY Op32 Deep Search 541 mi -42 dB in
Welshpool IO82ho with 0.2w + Marconi-T 17:23    136 LA3EQ de 2E0ILY
Op32 Deep Search 505 mi -42 dB in Shropshire IO82qv with 0.2w +
Marconi-T 17:19    136 LA3EQ de G8HUH Op32 605 mi -33 dB F:1% 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 has a  8 day  life , this  could be  reduced , but  with the  7
day operating 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
>>
>>
>>
>>
>>
>> UPLOAD
>>
>>
>>
>>   http://rosmodem.wordpress.com/
>>
>>
>>
>> SUPPORT
>>
>>
>>
>> https://groups.yahoo.com/neo/groups/O_P_E_R_A_/info
>>
>>
>>
>> https://www.facebook.com/groups/operadatamode/
>>
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2015.0.5577 / Virus Database: 4257/8885 - Release Date:
>> 01/07/15
>>
>
>
>



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5577 / Virus Database: 4257/8885 - Release Date:
01/07/15







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