Message-ID: <7A64238C4EA44F11B7BB8CDA9687EC2A@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <54B6D3D8.7070000@kpnmail.nl>
In-Reply-To: <54B6D3D8.7070000@kpnmail.nl>
Date: Wed, 14 Jan 2015 21:17:21 -0000
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Subject: Re: LF: Opera -Just a 2 mins carrier gives ghost detection.
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Status: O

Jan,

As posted , any decode  in dynamic , will  only  show  calls  from the  list 
, this  is the  bill  for  the  extra  5/6 dB  gain ..
your spots  are  pre-fixed   with  ''??''   this  is  added  by  the 
web-linked  system and  denotes  a  unique  detection , false Opera  decodes 
have  a  call  sign  format  , with  random  characters.

Deep Search ??

More than  one  detection/decode  is  then  used  to  certify the  spot

To  check  the  validity ,  you  can  use  the  psk-data  base , which 
holds  the  web-tx beacon  and  rx-spot time  stamped ,  Opera 8 Dynamic 
resolves  in 0>2  mins  , Op32Dy  2 >5 Mins  after  tx /end/decode

Otherwise , the  system  provides  the  quality  check ...

 false ....
19:31    477 SV8CS de NL9222 Op8 Deep Search ?? 1260 mi -35 dB in Mijdrecht 
with 0.1w + Marconi "T"

Ok ...inside  the 2<>5 Min  processing  time  for  op32 dy , G3XDV 
validating  the  tx  /rx  time

20:21    136 G8HUH de EA5DOM-RX Op32 Deep Search 889 mi -41 dB in Albir RX 
Site
20:17    136 G8HUH de G3XDV Op32 124 mi -13 dB F:0% in Welwyn IO91VT

73-G,
--------------------------------------------------
From: "pa3abk" <pa3abk@kpnmail.nl>
Sent: Wednesday, January 14, 2015 8:38 PM
To: "blacksheep" <rsgb_lf_group@blacksheep.org>
Subject: LF: Opera -Just a 2 mins carrier gives ghost detection.

> This eve I monitored MF Opera, however my WSPR timer was operational the 
> same time giving a 2 min carrier at h10, h30 & h50.
> Sorry for the unwanted QRM, however to my surprise NL9222 detected 
> following:
> 18:51    477 SV8CS de NL9222 Op8 Deep Search ?? 2027 km -35 dB in 
> Mijdrecht with 0.1w + Marconi "T"
> 19:11    477 LA3EQ de NL9222 Op8 Deep Search ?? 693 km -37 dB in Mijdrecht 
> with 0.01w + Marconi-T
> 19:31    477 SV8CS de NL9222 Op8 Deep Search ?? 2027 km -35 dB in 
> Mijdrecht with 0.1w + Marconi "T"
>
> NL9222 is 42km from me and receives my sigs at +1dB
>
> No other stations detected these stations. I assume they were not QRV 
> either.
> Maybe on LF?
>
> I have the feeling that Opera DS is acting more human than desired.
> It's the same when a CW human taker is decoding a plain language text in 
> heavy QRM at QSA 0.
> You assume that certain patterns is forming a plain word which match the 
> look_up table you have stored in your brain.
>
> Jan/pa3abk
>
> -- 
> pa3abk <-> dordrecht jo21it
> Sent by Philips STB-75 with T100
>
>